Pesticide Use and Water Quality: Are the Laws Complementary or in Conflict?

Pesticide Use and Water Quality:
Are the Laws Complementary or in Conflict?
Updated June 14, 2007
Claudia Copeland
Specialist in Resources and Environmental Policy
Resources, Science, and Industry Division

Pesticide Use and Water Quality:
Are the Laws Complementary or in Conflict?
This report provides background on the emerging conflict over interpretation
and implementation of the Federal Insecticide, Fungicide, and Rodenticide Act
(FIFRA) and the Clean Water Act (CWA). For the more than 30 years since they
were enacted, there has been little apparent conflict between them. But their
relationship has recently been challenged in several arenas, including the federal
courts and regulatory proceedings of the Environmental Protection Agency (EPA).
In this report, a brief discussion of the two laws is followed by a review of the major
litigation of interest. EPA’s efforts to clarify its policy in this area, including a
regulation issued in November 2006, are discussed, as well as possible options for
EPA and Congress to address the issues further.
FIFRA governs the labeling, distribution, sale, and use of pesticides, including
insecticides and herbicides. Its objective is to protect human health and the
environment from unreasonable adverse effects of pesticides. It establishes a
nationally uniform labeling system requiring the registration of all pesticides sold in
the United States, and requiring users to comply with the national label. The CWA
creates a comprehensive regulatory scheme to control the discharge of pollutants into
the nation’s waters; the discharge of pollutants without a permit violates the act.
Five federal court cases testing the relationship between FIFRA and the CWA
have drawn attention since 2001. In two cases concerning pesticide applications by
agriculture and natural resources managers, the U.S. Ninth Circuit Court of Appeals
held that CWA permits are required for at least some discharges of FIFRA-regulated
pesticides over, into, or near U.S. waters. It held in a third case that no permit was
required for the specific pesticide in question. Two other pending cases involve the
use of pesticides for mosquito control. In these cases, the U.S. Second Circuit Court
of Appeals has not yet addressed whether the application of FIFRA-approved
pesticides requires a CWA discharge permit.
The judicial rulings alarmed a range of stakeholders who fear that requiring
CWA permits for pesticide application activities would present significant costs,
operational difficulties, and delays. Pressed by many to clarify its long-standing
principle that CWA permits are not required for using FIFRA-approved products,
EPA in November 2006 issued a rule to formalize that principle in regulations.
Environmental activists strongly oppose EPA’s actions, arguing that FIFRA does not
protect water quality from harmful pollutant discharges, as the CWA is intended to
do. Other stakeholders, such as pesticide applicators, endorse the rule, although some
would like to see its application broadened to include pesticide drift.
Some believe that the controversy will only be resolved by congressional action
to clarify the intersecting scope of the Clean Water Act and FIFRA. Legislation
intended to do so by codifying EPA’s policy in law was introduced in the 109th
Congress, but it was not enacted. Legislation to reverse the policy was not
introduced. Whether these issues will receive attention in the 110th Congress is
unclear for now.

In troduction ..................................................1
The Laws....................................................2
The Litigation.................................................4
The Ninth Circuit Cases.....................................4
The Second Circuit Cases...................................6
Other Litigation...........................................7
EPA’s Regulatory Responses.....................................8
EPA’s 2003 Interim Guidance................................8
Responses to the 2003 Interim Guidance........................9
Final Guidance and Proposed Rulemaking.....................10
Rulemaking Proposal......................................11
Final Rule...............................................12
Congressional Interest and Future Options.........................13
Options for EPA and Congress..............................14

Pesticide Use and Water Quality:
Are the Laws Complementary or in Conflict?
It has been noted that “[t]he potential for overlapping and potentially conflicting
regulatory scope between federal statutes is common, especially in the heavily1
regulated area of environmental protection.” This potential is receiving attention
today in connection with implementation of the Federal Insecticide, Fungicide, and2
Rodenticide Act (FIFRA) and the Federal Water Pollution Control Act (Clean Water
Act, CWA).3 FIFRA requires the Environmental Protection Agency (EPA) to
regulate the sale and use of pesticides in the United States through registration and
labeling. The CWA is the principal federal law governing pollution in the nation’s
surface waters.
Pesticides used to control weeds, insects, and other pests receive public attention
because of potential impacts on humans and the environment. Depending on the
chemical, possible health effects from overexposure to pesticides include cancer,
reproductive or nervous-system disorders, and acute toxicity. Similar effects are
possible in the aquatic environment. Recent studies suggest that some pesticides can
disrupt endocrine systems and affect reproduction by interfering with natural
hormones. However, many pesticides and their breakdown products do not have
standards or guidelines, and current standards and guidelines do not yet account for
exposure to mixtures and seasonal pulses of high concentrations. Effects of
pesticides on aquatic life are a concern, because intensive surveys done by the U.S.
Geological Survey found that more than one-half of streams sampled had
concentrations of at least one pesticide that exceeded an EPA guideline for the
protection of aquatic life. Whereas most toxicity and exposure assessments of
pesticides are based on controlled experiments with a single contaminant, the U.S.
Geological Survey sampling found that most contamination of waterbodies occurred
as pesticide mixtures.4
For the more than 30 years since Congress enacted FIFRA and the Clean Water
Act, there has been little apparent direct conflict between them. EPA’s operating
principle during that time has been that pesticides used according to the requirements

1 Randall S. Abate and Matthew T. Stanger, “Pesticides and Water Don’t Mix: Addressing
the Need to Close a Regulatory Gap Between FIFRA and the CWA,” Environmental Law
Reporter News & Analysis, January 2005, p. 10056.
2 7 U.S.C. §§136-136y.
3 33 U.S.C. §§1251-1387.
4 U.S. Department of the Interior, U.S. Geological Survey, The Quality of Our Nation’s
Waters, Nutrients and Pesticides, USGS Circular 1225, 1999, pp. 3-9.

of FIFRA do not require regulatory consideration under the CWA. EPA has never
required CWA permits for use of FIFRA-approved materials, and EPA rules
currently do not specifically address the issue. However, EPA’s interpretation and
operating practice regarding the relationship between the two laws have recently been
challenged in several arenas. Federal courts have been one of two battlegrounds so
far where the potential conflict between the regulatory scope of these two laws has
been waged. EPA regulatory proceedings have been the second battleground area.
Congressional action could add a third testing of the issues.
At issue is how FIFRA-approved pesticides that are sprayed over and into
waters are regulated and, specifically, whether the FIFRA regulatory regime is
sufficient alone to ensure protection of water quality or whether such pesticide
application requires approval under a CWA permit. The issue arose initially over
challenges to some routine practices in the West (weed control in irrigation ditches
and spraying for silvicultural pest control on U.S. Forest Service lands). It
subsequently drew more attention in connection with efforts by public health officials
throughout the country to combat mosquito-borne illnesses such as West Nile virus.
The litigation created uncertainty over whether application of pesticides and
herbicides to waterbodies requires a water discharge permit. EPA has tried to
promulgate policy to clarify the relationship of the two laws and to address conflicts
resulting from several judicial rulings, ultimately in a regulation issued in November
2006. A related issue of interest to many pesticide applicators, but not yet addressed
by EPA policy or rule, concerns pesticides that unintentionally impact waterbodies
through drift or migration from nearby land, such as a field of crops.
This report provides background on the conflict over interpretation and
implementation of FIFRA and the Clean Water Act. A brief discussion of the two
laws is followed by a review of the major litigation of interest. EPA’s efforts to
clarify its policy in this area and the November 2006 final rule are discussed, as well
as possible options for EPA and Congress to further address the FIFRA-CWA issues.
The Laws
FIFRA is a regulatory statute governing the licensing, distribution, sale, and use
of pesticides, including insecticides, fungicides, rodenticides, and other designated
classes of chemicals. Its objective is to protect human health and the environment
from unreasonable adverse effects of pesticides. To that end, it establishes a
nationally uniform pesticide labeling system requiring the registration of all
pesticides and herbicides sold in the United States, and requiring users to comply
with conditions of use included on the national label. A FIFRA label encompasses
the terms on which a chemical is registered, and its requirements become part of
FIFRA’s regulatory scheme. In registering the chemical, EPA makes a finding that
the chemical “when used in accordance with widespread and commonly recognized
practice ... will not generally cause unreasonable adverse effects on the environment”
(7 U.S.C. §136a(c)(5)(D)).
EPA reviews scientific data submitted by pesticide manufacturers on toxicity
and behavior in the environment to evaluate risks and exposure associated with the
pesticide product’s use and takes into account the costs and benefits of various
pesticide uses. If a registration is granted, the agency specifies the approved uses and

conditions of use, which the registrant must explain on the product label. EPA may
classify and register a pesticide product for restricted use (those judged to be more
dangerous to the applicator or to the environment which can only be applied by or
under the direct supervision of a person who has been trained and certified) or for
general use. FIFRA preempts state, local, and tribal regulations stricter than or
different from EPA rules with respect to labeling requirements, but allows states and
localities to adopt more restrictive conditions with regard to sale and use.
Use of a pesticide product in a manner not consistent with its label is prohibited,
and the law provides civil and criminal penalties for violations. Under FIFRA, EPA
generally enforces the law’s requirements. However, the law also gives states with
adequate enforcement procedures, laws, and regulations primary authority for
enforcing FIFRA provisions related to pesticide use.
The objective of the CWA is to “restore and maintain the chemical, physical,
and biological integrity of the Nation’s waters.” To that end, it creates a
comprehensive regulatory scheme to control the discharge of waste and pollutants;
the discharge of pollutants into waters of the United States without a permit violates
the act. The permit requirement is at the heart of the act’s compliance and
enforcement strategy. Several aspects of these core requirements in the law are
important to evaluating whether the CWA applies to specific activities, including
whether there is a discharge from a point source (a discrete conveyance such as a
pipe, ditch, container, vessel, or other floating craft), whether the discharge is made
into waters of the United States, and whether the material discharged is a pollutant;
all of these terms are defined in the act. Especially key in the current context is
whether pesticides are pollutants under the act. This issue has been central to much
of the judicial and regulatory debate over whether the two laws, CWA and FIFRA,
are complementary or in conflict. CWA Section 502(6) (33 USC §1362(6)) defines
pollutant thus:
The term ‘pollutant’ means dredged spoil, solid waste, incinerator residue,
sewage, garbage, sewage sludge, munitions, chemical wastes, biological
materials, radioactive materials, heat, wrecked or discarded equipment, rock,
sand, cellar dirt and industrial, municipal, and agricultural waste discharged into
Section 402 of the act establishes the National Pollutant Discharge Elimination
System (NPDES) permitting requirement, which regulates the lawful discharge of
pollutants. The act defines “discharge of a pollutant” to mean “any addition of any
pollutant to navigable waters from any point source” (CWA Section 502(12); 33
USC §1362(12)). Discharges are permitted if they are authorized under a NPDES
permit that meets CWA requirements, including protecting the receiving waters.
NPDES permits specify limits on what pollutants may be discharged and in what
amounts. They also include monitoring and reporting requirements. They are either
individual case-by-case permits or general permits applicable to similar categories
of activities and similar waste discharges. Under the CWA, qualified states issue
NPDES permits to regulated sources and enforce permits, and the law allows states
to adopt water quality requirements more stringent than federal rules. As of 2006,
45 states had been delegated authority to administer the permit program; EPA issues
discharge permits in the remaining states.

The NPDES permit is the act’s principal enforcement tool. EPA may issue a
compliance order or bring a civil suit in U.S. district court against persons who
violate the terms of a permit, and stiffer penalties are authorized for criminal
violations of the act. As a practical matter, the majority of actions taken to enforce
the law are undertaken by states, both because states issue the majority of permits to
dischargers and because the federal government lacks the resources for day-to-day
monitoring and enforcement. In addition, individuals may bring a citizen suit in U.S.
district court against persons who violate the terms of a CWA-authorized permit or
who discharge without a valid permit. FIFRA does not authorize citizen suits.
Throughout the United States, pesticides often are applied in, onto, or near
waterbodies to control weeds and insects. Whether those pesticides are adversely
affecting water quality has not been a disputed issue until recently. It has been EPA’s
long-standing practice and interpretation of the laws that a CWA permit is not
required when pesticide application is done in a manner consistent with FIFRA and
its regulations. But that interpretation has been challenged in several lawsuits
brought since the late 1990s that have been decided since 2001.
The Litigation
Five federal court cases testing the relationship between FIFRA and the CWA
have drawn the most attention, three in the U.S. Court of Appeals for the Ninth
Circuit in the West, concerning pesticide applications by agricultural and natural
resource managers, and two in the Second Circuit Court of Appeals in the East,
involving the use of pesticides by government and public health authorities for
mosquito control. These cases have been brought principally under the citizen suit
provisions of the CWA. So far, two of the Ninth Circuit decisions have held that
CWA permits are required for at least some activity involving the point source
discharge of FIFRA-regulated pesticides over or into waters of the United States, and
the third held that a permit was not required because the specific pesticide was not
a chemical waste. The Second Circuit, while not yet holding that a permit is not
required, appears to some observers to be less willing to interpret the CWA to require
NPDES permits for application of FIFRA-regulated chemicals.5 Thus far, this
appeals court has remanded two cases to district courts for further proceedings
involving related issues; it has not yet specifically addressed whether the application
of FIFRA-approved pesticides requires a CWA discharge permit, as the Ninth Circuit
The Ninth Circuit Cases. The first of the major cases on these issues
involved application of herbicides in irrigation ditches. In the case, a major issue was
whether the application of pesticides constitutes the discharge of a pollutant.
Environmental groups challenged application of an aquatic herbicide called
Magnicide H to kill weeds and algae and sought to require that the applicator, a
municipal corporation that operates a system of irrigation canals in Oregon, obtain
an NPDES permit.

5 Randall S. Abate and Matthew T. Stanger, “Pesticides and Water Don’t Mix: Addressing
the Need to Close a Regulatory Gap Between FIFRA and the CWA,” Environmental Law
Reporter News & Analysis, January 2005, p. 10055.

The Ninth Circuit Court of Appeals endorsed the lower court’s ruling that the
pesticide was a pollutant under the CWA, and that the irrigation canals into which
the pesticide was being sprayed are “waters of the United States.”6 But it rejected the
lower court’s holding that a CWA permit was not required because the pesticide was
properly regulated by FIFRA and had an EPA-approved FIFRA label. The appeals
court ruled that FIFRA and CWA have different purposes and that, as such, neither
could be controlling on the application of the other. The court said that FIFRA
creates a comprehensive regulatory scheme for the labeling of pesticides, requiring
that all insecticides and herbicides sold in the United States be registered with the
EPA. It and the CWA have different, although complementary, purposes, the court
said, and using a pesticide with a FIFRA-approved label does not obviate the need
to obtain a CWA permit. The FIFRA label is the same nationwide. The CWA
permit considers local environmental conditions, which the FIFRA label does not.
Thus, a nationwide label on a FIFRA-regulated chemical could not be controlling on
whether a CWA permit is required, because it does not account for location-specific
requirements. The court reversed the district court’s grant of summary judgment in
favor of the defendants (Headwaters, Inc. v. Talent Irrigation District, 243 F.3d 526
(9th Cir. 2001)).
Several of the states within the Ninth Circuit subsequently took actions to
respond to this ruling. California and Washington amended their water quality
program rules to require NPDES permits for pesticide applicators. Oregon did not
mandate permits, but suggested that pesticide applicators obtain state-issued permits
to protect against lawsuits. Other states outside of the Ninth Circuit have not issued
permits for these types of activities.
The second major case in the West involved an annual U.S. Forest Service
(USFS) aerial spray program over national forest lands in Oregon and Washington.
Environmental groups filed a lawsuit challenging the spraying program, saying that
the environmental impact statement (EIS) prepared by the USFS was inadequate and
that the Forest Service had failed to obtain a CWA permit, which they argued is
required for this type of aerial spraying. The appeals court reversed the district
court’s grant of summary judgment for the Forest Service and instructed the lower
court to enter an injunction prohibiting the federal agency from further spraying until
it acquires an NPDES permit and completes a revised EIS (League of Wilderness
Defenders/Blue Mountains Biodiversity Project v. Forsgren, 309 F.3d 1181 (9th Cir.
2002)). The court disagreed with the argument of the Forest Service that the spraying
is nonpoint source water pollution, which does not require an NPDES permit. The
court held that the insecticides meet the CWA definition of “pollutant” and that the
application came from an aircraft equipped with spraying apparatus, thus meeting all
of the elements of the CWA’s definition of point source pollution.

6 In view of the Supreme Court’s June 2006 decision in Rapanos v. United States (126 S. Ct.

2008), coverage of irrigation canals as “waters of the United States” may depend on case-

specific circumstances, because the Court’s plurality opinion in this case made specific
reference to Headwaters, Inc. v. Talent Irrigation District. For additional information, see
CRS Report RL33263, The Wetlands Coverage of the Clean Water Act Is Revisited by the
Supreme Court: Rapanos v. United States, by Robert Meltz and Claudia Copeland.

In September 2003, the EPA General Counsel issued a legal memorandum to
officials in states located in the Ninth Circuit responding to the Forsgren case. The
memorandum said that EPA disagreed with the court’s holding in the case and that
outside the Ninth Circuit, EPA would continue its long-standing interpretation of
FIFRA and the CWA. Within the Ninth Circuit, the memo said, EPA would not
acquiesce to the ruling in the case of materials other than pesticides (such as those
used for fire control), or in circumstances where pesticides are not applied directly
over and into waters of the United States.7
The third and most recent Ninth Circuit case involved an effort by the Montana
Department of Fish, Wildlife and Parks to intentionally apply the pesticide antimycin
to a river in order to remove non-native trout species and thus to allow re-introducing
a threatened fish species into the river. The director of the department was sued
under the citizen suit provision of the CWA by a citizen who sought to require the
department to obtain an NPDES permit before applying the pesticide.
The court held in this instance that no NPDES permit was required, because the
facts of the case demonstrated that, following application as intended, the antimycin
dissipated rapidly, leaving no excess portions or residual chemical that should be
characterized as chemical waste, and thus is not a pollutant under the act (Fairhurst
v. Hagener, 422 F.3d 1146 (9th Cir. 2005)). Intentionally applied and properly
performing pesticides are not pollutants, the court said.
The court distinguished this case from its ruling in Headwaters, saying that the
factual scenarios differ, because “in that case the ‘chemical waste’ for which a
NPDES permit was required was not a pesticide serving a beneficial purpose and
intentionally applied to water, but was a chemical that remained in the water after the
Magnicide H performed its intended, beneficial function” (id. at 1150). Further, the
court stated that its analysis accords with EPA’s construction of the CWA’s
definition of “chemical waste” in the context of intentionally applied pesticides, and
that the agency’s 2003 Interim Statement and Guidance addressing the issue
(discussed below) is entitled to some deference. EPA’s interpretation as presented
in that Interim Statement is reasonable and not in conflict with the expressed intent
of Congress, the court said.
The Second Circuit Cases. Two cases in the Second Circuit involve the
use of pesticides for mosquito control. In the first case, several residents of the Town
of Amherst, N.Y., sought to halt aerial application of pesticides without a CWA
permit. The district court initially dismissed the case, stating that spray drift is not
chemical waste under the CWA and that the pesticide use was best regulated under
FIFRA. But the appeals court remanded the case to the district court for further
development of the record (Altman v. Town of Amherst, N.Y., 47 Fed. Appx. 62 (2d
Cir. 2002)). Although this ruling may not be cited as precedent, it is notable in that,
while EPA had filed an amicus curiae brief providing its views on this particular

7 Robert Fabricant, EPA General Counsel, “Interpretive Statement and Guidance Addressing
Effect of Ninth Circuit Decision in League of Wilderness Defenders v. Forsgren on
Application of Pesticides and Fire Retardants,” memorandum, September 3, 2003, 7 pp.

case, the court invited EPA to offer its views broadly on the policy and legal
questions. The court stated:
Until the EPA articulates a clear interpretation of current law — among other
things, whether properly used pesticides released into or over waters of the
United States can trigger the requirement for NPDES permits ... — the question
of whether properly used pesticides can become pollutants that violate the CWA
will remain open. Participation by the EPA in this litigation in any way that
permits articulation of the EPA’s interpretation of the law in this situation would8
be of great assistance to the courts.
The second pertinent case in the Second Circuit also involved the use of
pesticides for control of mosquitoes. Plaintiffs in the case, a citizens group, sought
an injunction to halt the aerial and ground spraying, arguing that although the
pesticides were properly regulated under FIFRA, the spraying program involved the
discharge of a pollutant without a CWA permit, and thus was a violation of that law.
While the federal district court ruled that FIFRA’s refusal to allow enforcement by
citizen suit should prevail over the CWA’s allowance of such suits unless the alleged
violation of the CWA also constitutes a substantial violation of FIFRA, the appeals
court disagreed. It held that the CWA authorizes any citizen to bring suit to enforce
its requirements, regardless of whether the claimed CWA violation also violated
FIFRA (No Spray Coalition v. City of New York, 351 F.3d 602 (2d Cir. 2003)). The
Second Circuit remanded the case to the district court for further proceedings on the
CWA claims. In June 2005 the district court rejected summary judgment motions by
the parties, saying that disputed issues of material fact exist as to whether the city has
discharged a pollutant into navigable waters without a permit (2005 Westlaw


Other Litigation. Other lawsuits have followed these cases. For example,
private citizens who operate an organic fruit farm in Gem County, Idaho, brought suit
against the local mosquito abatement district there, seeking to require a CWA permit
for pesticide spraying. Finding itself in the proverbial spot “between a rock and a
hard place,” the mosquito abatement district applied for a permit from EPA, which
the agency declined to issue, based on its long-standing policy and legal
interpretation. Thereafter, the mosquito abatement district filed a lawsuit against
EPA in an attempt to obtain a declaration that a CWA permit is not needed and to
avoid the citizen suit litigation, which is pending in federal court in Idaho. The
mosquito abatement district asked the federal court either for a judgment saying that
no permit is required or, if the court were to determine otherwise, an order directing
EPA to process its CWA permit application. In January 2005, the federal district
court in the District of Columbia dismissed the case because the mosquito abatement
district and EPA were in agreement that no CWA permit is required for pesticide
applications that are consistent with FIFRA (Gem County Mosquito Abatement
District v. EPA, 398 F. Supp. 2d 1 (D.D.C. 2005)). The citizen suit litigation in
federal court in Idaho is continuing.
In other locations, citizen groups have given notice, as required by the CWA,
of possible lawsuits to expand the precedent from the Ninth Circuit cases to other

8 47 Fed. Appx. at 67.

types of operations. Two actions, in August 2004 and March 2005, were threatened
against Maine blueberry farmers for failing to obtain a CWA permit for spraying
pesticides that may drift off-target from land into waterbodies. In response to the
litigation pressure, however, both farmers subsequently announced plans to cease
aerial spraying and instead rely on ground spraying, until such time as government
or the courts clarify the law.
EPA’s Regulatory Responses
The rulings by the Ninth Circuit in the Headwaters and Forsgren cases and
possible endorsement by other courts greatly alarmed a range of stakeholders in the
regulated community, including forestry, agriculture, and pesticide applicators, as
well as municipal and public health officials concerned with the need to control
mosquitos and other vectors associated with diseases such as West Nile virus and
malaria. They feared that CWA permit requirements would be extended to
agricultural and other activities that have not traditionally been regulated under the
CWA. They argue that if permits tailored to particular circumstances are deemed
necessary, such requirements would present significant costs, operational difficulties,
and delays to applicators. They also would put pressure on limited federal and state
CWA permitting resources. In their view, requiring permits will not be
environmentally helpful, but the expense and long delays of permitting proceedings
will hamper programs that are needed for controlling pests that threaten public health
and crops. In response, EPA has issued two interpretive guidance documents (in
2003 and 2005) and in 2005 proposed a rulemaking to formalize its long-standing
position on CWA-FIFRA issues. A final rule was promulgated in November 2006.
EPA’s 2003 Interim Guidance. Since the Altman v. Town of Amherst ruling
in 2002, industry, states, and others, including some in Congress, have pressed EPA
to clarify the emerging conflicts over the two laws. EPA responded in July 2003 with9
an Interim Statement and Guidance memorandum. In it, EPA presented its
interpretation of whether an NPDES permit is required for the application of
pesticides that comply with FIFRA. EPA’s position was that application of
pesticides either directly in U.S. waters or aerially above or near the waters to control
pests does not require a CWA permit, so long as the use is done in compliance with
relevant FIFRA requirements. The memorandum acknowledged the federal court’s
holding to the contrary in the Headwaters v. Talent case, but then described why EPA
concludes otherwise. Under the agency’s evaluation, pesticides applied in a manner
consistent with FIFRA do not constitute either chemical wastes or biological
materials under the definition of pollutant in Section 502(6) of the CWA. The
rationale for this position is that it is consistent with over 30 years of CWA
administration.10 The memorandum noted that pesticide applications in violation of
FIFRA, that is, when not used or applied according to applicable labeling
requirements, would be subject to all relevant statutes, including the Clean Water
Act. EPA invited public comments on the interim guidance statement through

9 U.S. Environmental Protection Agency, “Interim Statement and Guidance on Application
of Pesticides to Waters of the United States in Compliance with FIFRA,” 68 Federal
Register 48385, August 13, 2003.
10 Ibid., p. 48387.

October 14, 2003, but the position stated in the memorandum took effect
immediately and would apply until EPA issues a final position on the matter.
The Interim Statement addressed in detail the question of whether, in EPA’s
view, pesticides are pollutants, within the meaning of CWA Section 502(6), since the
discharge of pollutants is regulated under the act. In the memorandum, EPA argued
that chemical pesticides are not wastes, and therefore are not pollutants, because they
are “EPA-evaluated products designed, purchased and applied to perform their
intended purpose of controlling target organisms in the environment.”11 Neither does
EPA believe that biological pesticides (e.g., products derived from plants, fungi,
bacteria, or other non-man-made synthesis and which can be used for pest control
that usually do not have toxic effects on animals and people, compared with many
chemical pesticides) are pollutants. Both chemical and biological pesticides are
intended to perform essentially similar functions, and it would be “nonsensical” to
treat chemical and biological pesticides differently.12
Responses to the 2003 Interim Guidance. The 2003 guidance was
issued in part to clarify the agency’s interpretations of legal rulings on the issue and
to remove any uncertainty regarding application of herbicides and pesticides to
combat vector-borne diseases that are transported by mosquitoes. However, EPA’s
guidance satisfied few stakeholders, for differing reasons.
Environmental activists strongly objected to EPA’s position, which they argue
is contrary to the recent judicial rulings. These groups reiterated points made by the
Ninth Circuit court in the Headwaters and Forsgren rulings, namely that chemical
and biological pesticides are pollutants within the meaning of the CWA, as the law
defines pollutants broadly and includes, among other substances, chemical wastes,
biological materials, and agricultural wastes. As that court has declared,
environmentalists said, FIFRA does not override the CWA, and the two statutes must
work in tandem to prevent injury to aquatic life. They also argued that EPA is
wrongly deciding that materials with beneficial uses should not be construed as
pollutants under the CWA.
Environmentalists’ objections also went to the policy problems of relying on
FIFRA to protect water quality from pesticide applications, as that would be the
result of EPA’s position. That position, critics said, turns on whether the pesticide
application conforms procedurally with FIFRA requirements, not what is the water
quality impact of that pesticide. Other concerns raised by critics included the fact
that while the FIFRA registration process calls for ecological risk assessment that
may be adequate for producing nationally applicable labels, it does not ensure that
local water quality standards are maintained and does not account for additive or
synergistic effects of multiple pollutants discharged to a particular waterbody.
Environmentalists argued that the CWA provides the means to determine whether,
and under what conditions, it is safe to discharge a particular pesticide into a
particular body of water, and that FIFRA’s nationally uniform labeling system cannot
do that. FIFRA is not specifically charged with ensuring the chemical, physical, and

11 Ibid., p. 48388.
12 Ibid.

biological integrity of U.S. waterways, and satisfaction of a pesticide’s FIFRA
labeling criteria does not automatically satisfy water quality concerns, as the NPDES
permit process is intended to do. They also maintained that FIFRA fails to consider
the lasting effects that pesticide residues have on a local ecosystem and that localized
analysis of the environmental impact of pollutant discharges under the CWA is
necessary, due to the toxic residues that remain after pesticide application, which
FIFRA does not address.
Additionally, activists said, FIFRA has no provisions for publicly accessible
compliance information and no means of citizen enforcement in case of violations,
as does the CWA. FIFRA essentially assumes users’ compliance with restrictions on
a pesticide’s label.
Industry welcomed the thrust of the 2003 Interim Statement but also urged that
it be broadened. Agricultural groups requested that EPA include other classes of
applications under the guidance, such as aquaculture and crop production. Beyond
the types of uses described in the proposed rule, some argued that EPA should
additionally clarify that CWA permits are not required in the case of pesticides that
are applied over land and then inadvertently impact waterbodies through drift and
migration. Many of these commenters requested that EPA address the issues
definitively in a rulemaking, rather than in non-binding guidance. In their view,
without clear regulatory language supporting EPA’s interpretation, pesticide
applicators would still face the prospect of citizen lawsuits and NPDES permit
Many states and local governments, including agriculture agencies, irrigation
districts, and mosquito abatement districts, strongly endorsed EPA’s proposed
clarification of its interpretation of the two laws. However, a few — especially states
located in the jurisdiction of the federal Ninth Circuit — expressed a different view.
The Oregon Department of Environmental Quality and California State Water
Resources Control Board commented that the Interim Statement conflicted with legal
precedent in the Headwaters case. They urged EPA, if it wishes to create an
exemption for pesticide applications conducted in compliance with FIFRA, to ask
Congress to amend the Clean Water Act and FIFRA accordingly.
Final Guidance and Proposed Rulemaking. In January 2005, 18 months
after issuing the Interim Guidance memorandum and considering public comments
on it, EPA issued final guidance in the form of an Interpretive Statement and
Guidance and simultaneously proposed a formal rulemaking to codify the substance
of the guidance in CWA regulations.13
The 2005 Interpretive Statement closely mirrored the 2003 Interim Statement
and Guidance. EPA modified the 2003 guidance in several minor ways, such as
clarifying that compliance with “relevant requirements under FIFRA” refers to
requirements relevant to protection of water quality and clarifying that the exclusion

13 U.S. Environmental Protection Agency, “Application of Pesticides to Waters of the United
States in Compliance With FIFRA, proposed rulemaking and notice of interpretive
statement,” 70 Federal Register 5093, February 1, 2005.

from permit requirements applies to control of pests on or above U.S. waters and
pests near water, as well. The final Interpretive Statement did not endorse the
expansion sought by some to clarify that CWA permits also are not required for
pesticide applications to land and crops that may drift to nearby waterbodies.
Press reports indicated that EPA termed the final policy an “interpretive
statement” rather than “guidance” in an effort to get more deference from the courts
when agency policies face legal challenge. EPA also hoped that, because the agency
solicited public comments on the 2003 Interim Statement, courts would give
deference to the final policy.14
In public comments on the 2003 interim guidance, a number of critics argued
that EPA’s interpretation of the two laws represented a reversal of positions the
agency had taken in the Forsgren case when it supported environmentalists’ appeal
of the district court’s original ruling, as well as its position in amicus curiae briefs
in other litigation. In its amicus brief in Forsgren, EPA stated that the regulatory
review required by each of the statutes is different and considers different factors and
that FIFRA does not take into account all factors needed to judge whether a particular
pesticide discharge should be permitted under the CWA. Responding to those points,
the EPA General Counsel issued a memorandum in January 2005 to explain some of
those prior statements. The memorandum acknowledged that there could seemingly
be inconsistencies in previous government positions but argued that, on detailed
examination, differences are based on the specific facts of the litigation, not the
general policies now being addressed. Moreover, in the current context, the
Interpretive Statement fully reflects “the exercise of the Agency’s legal and policy
judgment after considering public comments” and “the evolution in the Agency’s
thinking in certain respects since the brief was filed in that case.”15
Rulemaking Proposal. Simultaneously with issuance of the Interpretive
Statement and Guidance in January 2005, EPA also proposed a rulemaking to codify
the Interpretive Statement. The proposed rule would modify EPA regulations (40
CFR §122.3) to specify that NPDES permits are not required for the application of
pesticides to U.S. waters consistent with all relevant requirements under FIFRA in
order to control pests that are present over waters of the United States, including near
such waters, that results in a portion of the pesticides being deposited to U.S. waters.
EPA rules previously had not addressed the relationship of the two laws on this issue.
The CWA allows states to adopt water quality policies and rules more stringent
than EPA requires. As noted above, some stakeholders feared that, so long as EPA’s
policy was articulated just as guidance, states could choose to require CWA permits
for pesticide application. Thus, one rationale for formalizing the EPA policy in a rule
was presumably to restrict that possibility. In the 2005 Interpretive Statement, the
agency said that, under this interpretation, “a pesticide applicator is assured that

14 Susan Bruninga, “Discharge Permit Not Needed for Application of Pesticides, EPA
Proposed Rule, Policy Say,” Daily Environment Report, January 27, 2005, p. A-9.
15 Ann R. Klee, EPA General Counsel, “Analysis of Previous Federal Government
Statements on Application of Pesticides to Waters of the United States in Compliance with
FIFRA,” Memorandum, January 24, 2005, pp. 1-2.

complying with relevant requirements under FIFRA will mean that the activity is not
also subject to the distinct NPDES permitting requirements of the CWA.”16
However, EPA also noted that the policy does not preclude states from further
limiting the use of a particular pesticide in order to address local water quality
concerns. Some may see these two statements as being somewhat inconsistent.
Final Rule. The 2005 guidance and proposed rule allowed a second
opportunity for the public to comment on EPA’s policy. After reviewing those
comments, EPA promulgated a final rule in November 2006 to formalize its
interpretation of the CWA-FIFRA issues.17 The final rule, which became effective
January 26, 2007, substantially tracked the 2005 proposal to revise the NPDES
program rules to add two specific circumstances that are excluded from NPDES
permit requirements, when the application complies with relevant requirements of
!the application of pesticides directly to waters of the United States
in order to control pests (e.g., to control mosquito larvae or aquatic
weeds); and
!the application of pesticides to control pests that are present over
waters of the United States, including near such waters, where a
portion of the pesticides will unavoidably be deposited to waters of
the United States in order to target the pests effectively.
EPA modified the 2005 proposal only to clarify the types of pesticide applications
covered in the second circumstance to be those where the pesticide necessarily must
enter the water to achieve its intended purpose. For example, “mosquito adulticide
applications can result in some pesticide product entering the water because adult
mosquitoes generally live over and adjacent to waterbodies.”18
In the final rule, EPA provided a lengthy discussion of its rationale that
pesticides, when applied pursuant to FIFRA, are not chemical wastes or biological
materials and thus are not what the CWA defines as “pollutants” (see discussion,
page 3, above). However, EPA also acknowledged that application of pesticides may
leave residual materials in U.S. waters after the product has served its beneficial
purpose and that these residual materials may be “pollutants” under the act at that
later time. Nonetheless, even in such cases, EPA said, the initial application of the
pesticide does not require an NPDES permit because EPA does not consider it to be
a pollutant at the time of its discharge into water.19 The agency also responded to
some public comments on the proposal that had criticized the adequacy of the FIFRA
registration process for consideration of water quality, local conditions, etc. EPA
said that the “regulatory and non-regulatory tools under FIFRA provide means of

16 70 Federal Register 5100.
17 U.S. Environmental Protection Agency, “Application of Pesticides to Waters of the United
States in Compliance With FIFRA,” Final Rule, 71 Federal Register 68483, November 27,


18 Id. at 68486.
19 Id. at 68487.

addressing water quality problems arising from the use of pesticides,” particularly the
registration and re-registration processes, which consider both human health and
aquatic resource impacts.20
The rule prompted multiple lawsuits brought by industry and environmental
groups in almost every judicial circuit nationwide. In January, the litigation was
consolidated into National Cotton Council, et al., v. EPA (CA 6, Civil No. 06-4630).
Industry’s challenge seeks to expand the rule to apply to all pesticides and all
agricultural applications of pesticides, including applications to land that drift over
or into water. Environmentalists’ challenge claims that, by eliminating permit
requirements for certain types of aerial spraying and other direction applications of
pesticides to the nation’s waters, the rule ignores EPA’s duties under the Clean Water
Congressional Interest and Future Options
Congressional interest in these issues became apparent after the first federal
appeals court ruling in one of the key FIFRA-CWA cases, the 2001 Headwaters v.
Talent ruling. Two congressional hearings held since then focused on implications
of the cases for pesticide use generally and for local governments’ efforts to control
mosquito-borne illnesses such as West Nile Virus. A hearing also was held on
legislation introduced in the 109th Congress to clarify the scope of the CWA
regarding the use of FIFRA-approved pesticides, fire retardants, and biological
control organisms.
In October 2002, a House Transportation and Infrastructure subcommittee held
a fact-finding hearing on the issues.21 The subcommittee’s particular concern derived
in part from the fact that one of the key practices used to manage stormwater runoff,
which is regulated under the Clean Water Act, is to collect and hold it in retention
ponds, basins, drainage ditches, etc. Such practices can be at odds with the public
health objective of controlling insect-breeding habitat by eliminating or draining
sources of standing water. Stormwater management practices typically allow
collected water to drain slowly, while public health efforts would prefer that it be
removed quickly. Another way to address the public health concerns is to spray
pesticides on stormwater management structures and other areas of standing waters.
The question for this subcommittee was the uncertainty raised by the litigation over
the CWA-FIFRA issues for communities, industries, and others needing to maintain
stormwater control systems. An EPA official, while acknowledging that the issue of
CWA jurisdiction over pesticide spraying is “new territory” for the agency, said that
EPA believes there is no inherent conflict between protecting water quality and
preventing mosquito-borne disease. At the hearing, some Members and public
witnesses urged EPA to provide guidance to resolve uncertainties raised by the court

20 Id. at 68488-68489.
21 U.S. Congress, House, Committee on Transportation and Infrastructure, Subcommittee
on Water Resources and Environment, “West Nile Virus: The Clean Water Act andth
Mosquito Control,” Hearing, October 10, 2002, 107 Congress, 2d Session, unpublished.

A hearing held by a House Government Reform subcommittee in October 2004
examined challenges to controlling West Nile Virus.22 The hearing was an
opportunity for some Members and witnesses to express the view that EPA’s July
2003 interim guidance, while helpful in clarifying EPA’s position, failed to resolve
all legal uncertainty, since it would not bind non-federal entities or bar citizen
lawsuits. Witnesses said that EPA’s guidance is a nonbinding legal document that
would not deter filing of citizen lawsuits seeking to impose a permit requirement.
Supporters of this view urged EPA to settle the legal questions through a formal
rulemaking to revise CWA rules. An EPA official said that even if EPA were to
promulgate a rule (as it subsequently did), states will still have the discretion to
continue to require non-NPDES permits, and a formal rule would not preclude citizen
lawsuits from seeking to force localities to file for permits. EPA made these same
points in the January 2005 Interpretive Statement, as noted above. Others at this
hearing agreed on the need for a formal rulemaking, but recommended that in doing
so, EPA should reverse the interpretation detailed in the guidance, not codify it.
In the 108th Congress, Senate appropriators included language in their report on
EPA’s FY2005 budget calling on EPA to finalize the interim guidance by December
2004 and to clarify the long-standing distinction between agriculture and silviculture
activities that do and do not require CWA permits.23
In 2003, a number of House and Senate Members urged the Bush
Administration to support Supreme Court review of the Forsgren case, but ultimately
the Administration did not endorse industry’s request for a review, and the Court did
not grant certiorari. Some Members of Congress also submitted comments in support
of the July 2003 interim guidance document and the January 2005 regulatory
proposal. 24
Options for EPA and Congress. As described above, in November 2006,
EPA issued a final rule, consistent with its long-standing view, amending CWA
regulations to specify two circumstances in which pesticides applied to waters of the
United States, consistent with all relevant requirements of FIFRA, do not require
NPDES permits. Judicial challenges to the rule can be anticipated and would
presumably address many issues previously addressed by the courts in litigation
discussed in this report.
EPA has additional administrative options, as well, beyond its actions to date.
In the final rule, EPA declined to address the issue of pesticide drift, although many
stakeholders had urged the agency to do so. The Federal Register Notice
accompanying the rule noted that EPA is awaiting advice from a workgroup of its

22 U.S. Congress, House, Committee on Government Reform, Subcommittee on Energy
Policy, Natural Resources and Regulatory Affairs, “Current Challenges in Controlling theth
West Nile Virus,” Hearing, October 6, 2004, 108 Congress, 2d Session (Serial No. 108-

274), 182 p.

23 U.S. Senate, Committee on Appropriations, “Departments of Veterans Affairs and
Housing and Urban Development, and Independent Agencies Appropriations Bill, 2005,”th
report to accompany S. 2825, 108 Cong., 2d sess., pp. 110-111.
24 Materials included in the EPA docket, No. OW-2003-0063, including submissions by
Members of Congress, can be found at [].

Pesticide Program Dialogue Committee, which could recommend further actions.
This committee was established in 1995 as a forum to provide feedback to EPA on
various pesticide regulatory, policy, and program implementation issues. It is
authorized pursuant to the Federal Advisory Committee Act (FACA), which details
requirements for the management and oversight of federal advisory committees to
ensure impartial and relevant expertise and advice to EPA and other agencies. In
March 2006, the committee convened a Spray Drift Workgroup charged with
studying the issue of pesticide drift across water and its accompanying impact on
water quality and wildlife. In April 2007, the workgroup finalized a report that
focused on issues related to product labeling, applicator training, and practices and
equipment to mitigate drift and adverse effects.25
Other options for EPA relate to implementation of FIFRA and procedures used
to evaluate the risks of pesticides during the registration process. Environmentalists
have argued for some time that EPA’s risk review procedures are inadequate because
they fail to account for synergistic and additive effects, as well as sub-lethal and
indirect effects of pollutants on the environment. In 2003, EPA convened a task
force of officials from its pesticide and water quality offices to explore, among other
things, whether the agency’s pesticide review processes are protective enough to
meet water quality standard limits. One outcome of the task force’s review could be
changes to implementation of FIFRA in order to address some of these concerns.
Congress has several options, too, beginning with conducting further oversight
of the issues. Another option could involve legislation to revise the CWA and or
FIFRA, and some have urged EPA to ask Congress to legislate a resolution of these
possible conflicts. Many environmental activists, however, would favor clarifying
that permits are required, since they believe that EPA’s approach in the previous
guidance and now in the final rule is unlawful.
Alternatively, Congress could enact legislation to clarify that permits are not
required for some or all pesticide spraying activity, as favored by members of the
pesticide application industry and others, since many of these stakeholders believe
that the earlier EPA guidance and possibly even the November 2006 rule do not
provide adequate protection from citizen suits. Legislation intended to do so was
introduced in the 109th Congress (H.R. 1749 and S. 1269, the Pest Management and
Fire Suppression Flexibility Act), but it was not enacted. These bills would have
provided that NPDES permits are not required for the use of FIFRA-approved
pesticides; chemicals, fire retardants, or water used for fire suppression; biological
organisms used for plant pest or weed control; or silviculture activities such as timber
harvesting that are not currently regulated as point source activities.
As discussed above, EPA’s final rule addresses situations in which pesticides
are put directly in waters to control pests (e.g., controlling mosquito larvae or aquatic
weeds) or cases of pesticides that are present over water and a portion of the pesticide
is deposited in the water (e.g., aerial application to a forest canopy where waters of
the United States may be present below the canopy). The proposed legislation in the
109th Congress, in addition to codifying these policies, also addressed other, broader
circumstances that EPA so far has declined to include in its regulations: applications

25 For information, see [].

over land areas that may drift over and into waters of the United States, broad
exemption of activities for preventing or controlling plant pests or noxious weeds,
and use of fire retardants.26
In September 2005, a House Transportation and Infrastructure subcommittee
held a hearing on H.R. 1749.27 Witnesses representing a number of sectors that are
pesticide users (state foresters, western irrigation districts, and farmers) testified in
support of the legislation, saying that it would resolve existing legal uncertainties
about permitting. An EPA witness said that the agency’s then-proposed rulemaking
would reduce current uncertainty about the relationship between FIFRA and the
CWA. The legislation similarly would clarify the interaction between the two laws,
this witness said, noting the other types of uses addressed in the legislation but not
in the rulemaking, such as spray drift. The EPA official did not expressly endorse
the legislation, but he said that EPA appreciates congressional efforts to reduce
potential confusion over these issues. There was no further action on either H.R.
1749 or S. 1269. Legislation that would reverse EPA’s policy and affirm that CWA
permits are required for pesticide applications that impact the nation’s waters was not
Many environmental advocates believe that legislation is not needed because,
in their view, the CWA is clear enough that permits are required for discharge of
pesticides from point sources. What is needed, in their view, is for EPA to revise its
interpretation of the laws in accordance with judicial rulings. At the same time,
many who would favor legislation supporting a narrow view of the CWA’s
jurisdiction on this issue acknowledge that any legislative effort would be
controversial and could be seen as representing not clarification but, rather, an
environmental rollback. Whether these issues will receive attention in the 110th
Congress is unclear.

26 Reflecting a different approach, Rep. Goodlatte introduced a bill in the 107th Congress,
H.R. 5329, that proposed amending FIFRA to expand the definition of what constitutes a
“public health” pesticide in an effort to ease industry’s ability to register pesticides for use
in combating mosquito-borne illnesses.
27 U.S. Congress, House, Committee on Transportation and Infrastructure, Subcommittee
on Water Resources and Environment, “Hearing, ‘H.R. 1749, Pest Management and Firethst
Suppression Flexibility Act,’” 109 Cong., 1 sess., September 29, 2005 (109-33), 110 pp.