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June 7, 2018


Endangered Species Considerations in Pesticide Use

Restrictions: Background and Legislation


The Federal Insecticide, Fungicide, and Rodenticide Act
(FIFRA;  7 U.S.C. 136 et seq.) requires that pesticides,
before being approved for distribution or sale, must be
registered by the U.S. Environmental Protection Agency
(EPA). Registration approval depends on a finding that the
pesticide will not pose unreasonable adverse effects on the
environment when  used in conformance with labeling
directions. To avoid unlawful takings of federally listed
threatened or endangered species under the Endangered
Species Act (ESA; 16 U.S.C. 1531 et seq.) from permitted
uses of pesticides under FIFRA, EPA must consult with the
U.S. Fish and Wildlife Service (FWS) or the U.S. National
Marine Fisheries Service (NMFS), depending on the listed
species of concern. The purpose of consultation is to
determine whether a federal action may jeopardize listed
species or adversely modify their critical habitat and, if so,
to develop alternative federal actions that would avoid such
jeopardy or adverse modification.

Since 1988, several organizations have challenged the
adequacy of the consultation process for pesticide
registrations and its protectiveness of listed species.
Conversely, pesticide manufacturers and applicators have
asserted that overly conservative approaches to evaluating
risk to listed species by FWS and NMFS leads to pesticide
use restrictions that are not adequately supported by
scientific and technical information. Currently, EPA, FWS,
and NMFS   must ensure that the permissible uses of more
than 1,100 pesticide active ingredients do not jeopardize
over 1,400 listed species or their critical habitats.

Pesticide Re istration Process and
Endangered Species Consultation
Before EPA  registers a pesticide, the agency conducts risk
assessments to determine whether unreasonable adverse
effects on the enviromnent may result from uses to be
permitted by the registration. As part of the assessments,
EPA  determines whether listed species under the ESA
might be affected by such uses. Generally, unreasonable
risks identified by the agency may be avoided through
labeling requirements that specify restrictions on use. For
more information on the pesticide registration process
under FIFRA, see CRS  Report RL31921, Pesticide Law: A
Summary  of the Statutes.

Under ESA  Section 7 (16 U.S.C. 1536), if federal actions-
or actions of nonfederal parties that require federal
approvals, permits, or funding-might adversely affect
listed species as determined by FWS or NMFS, the federal
agency taking, approving, or funding such actions must
complete a biological assessment to determine whether


formal consultation is necessary. The assessment must be
based on the best scientific and commercial data
available. For purposes of pesticide registrations,
biological assessments are also referred to as effects
determinations.

Through  consultation with either FWS or NMFS, federal
agencies must ensure that their actions are not likely to
jeopardize the continued existence of any listed species or
adversely modify their critical habitats. Critical habitat
includes the geographic areas occupied by the species at the
time of listing and areas outside that geographic area
determined by FWS  or NMFS  as essential for the
conservation of the species.

If FWS  or NMFS  finds that an action (e.g., pesticide
registration) would neither jeopardize listed species nor
adversely modify critical habitat, the service issues a
biological opinion that may include a written incidental
take statement specifying the terms and conditions under
which the federal action may proceed. If FWS or NMFS
finds that an action would jeopardize listed species or
adversely modify critical habitat, the service must suggest
reasonable and prudent alternatives that would avoid harm
to the species. Regulations that govern the consultation
process are codified at 50 C.F.R. Part 402. See CRS Report
RL31654,  The Endangered Species Act: A Primer for more
information on the ESA and the consultation process.

Lit  gation   Challenging Adequacy of
En  d-anered Species Consultations for
Pesticide Registrations
EPA,  FWS, and NMFS   implementation of the ESA
consultation process for pesticide registrations has been
litigated multiple times in federal court. The litigation has
resulted in court orders and legal settlements that direct the
agencies to take certain actions to comply with the ESA.

In 1988, a federal appeals court ruled that without an
incidental take statement prepared by FWS through the
consultation process, EPA's registration of the pesticide
strychnine constituted unlawful taking under the ESA
(Defenders of Wildlife v. EPA, 882 F.2d 1294, 8th Cir.,
1988). The decision affirmed the consultation requirement
for pesticide registrations.

Subsequent litigation has focused on specific elements of
the consultation process. For example, in separate
decisions, federal district and appeals courts have directed
EPA  to conduct effects determinations for various
pesticides (e.g., Washington Toxics Coalition v. EPA, 413


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