WASHINGTON PESTICIDE LAWS LATEST 2026 FINALS
EXAM QUESTIONS AND SOLUTIONS GUARANTEE A+
✔✔WSDA administers several rules to protect bees and beneficial organisms. -
✔✔There are also rules to reduce off target drift and the potential for groundwater
contamination.
✔✔Some items subject to specific regulation in WA state include: - ✔✔-applications of
many insecticides to alfalfa, clover, mint, and corn;
-use of encapsulated methyl parathion;
-applications of phenoxy hormone type herbicides, dessicants, and defoliants in Eastern
Washington;
-restricted use classifications of some products that pose concerns for groundwater;
-secondary containment of liquid bulk pesticides,
-and general safety requirements for chemigation;
✔✔Applications to aquatic environments: - ✔✔WSDA has designated all pesticide
formulations label for application onto or into water state restricted use. Only certified
applicators with the private or aquatic license endorsement can purchase or use these
products (unless used under their direct supervision). A permit must also be issued by
the department of ecology to any person for the application of pesticides to water. The
only exception is the application of copper sulfate for algae control by a water supply
system agency for control in that agencies' water supply waters.
✔✔The EPA: - ✔✔regulates pesticide and environmental issues at a federal level
✔✔The FDA: - ✔✔monitors pesticide residues on or in the nation's food supply
✔✔The Occupational Safety and Heath Administration (OSHA): - ✔✔regulates worker
safety issues
✔✔The Federal Aviation Administration (FAA) - ✔✔regulates the use of aircraft in aerial
applications.
✔✔The US Department of Transportation (DOT): - ✔✔regulates interstate
transportation issues.
✔✔WA: Emergency Management Division (EMD): - ✔✔handles crisis spills and leaks
✔✔WA: Department of Ecology (Ecology): - ✔✔regulates environmental issues caused
by pesticides, such as spills, contamination, aquatic applications, hazardous wastes,
and disposal.
, ✔✔WA: Department of Labor and Industries (L&I): - ✔✔regulates employee safety
issdues, worker right-to-know regulations, worker protection standards, and
cholinesterase monitoring.
✔✔WA: Department of Health (DOH): - ✔✔handles health issues.
✔✔WA: Department of Community, Trade and Economic Development (CTED): -
✔✔regulates community right-to-know issues.
✔✔WA: Washington State Patrol (WSP): - ✔✔handles intrastate transportation issues
by private carriers.
✔✔WA: Washington Utilities and Transportation Commission (WUTC): - ✔✔handles
intrastate transportation issues by commercial carriers.
✔✔Active ingredient: - ✔✔the actual chemical in the product mixture that controls the
pest.
✔✔Inert ingredient: - ✔✔other materials added with the AI when the product is
formulated.
✔✔Pesticide Formulation: - ✔✔The mixture of active and inert ingredients.
✔✔Phyotoxicity: - ✔✔Plant damage.
✔✔Adjuvant: - ✔✔product added to a spray tank to assist pesticide in its application.
✔✔Calculating the amount of an AI in a dry formulation: - ✔✔requires multiplying the
weight of the product by the percent of the active ingredient.
✔✔Calculating the amount of an AI in a liquid formulation: - ✔✔requires multiplying the
weight of the AI per gallon by the volume of product. It is necessary to know how much
AI is present per gallon instead of just the percent of the product that is an AI. This
number is present in the active ingredient statement.
✔✔Why add inert ingredients? - ✔✔-For ease of pesticide handling
-Inerts make measuring and mixing pesticides easier.
-To increase safety of a formulation.
-Makes the AI work better (better penetration, more selectivity, increased effectiveness).
✔✔Labels will often recommend the addition of adjuvants to the tank mix. - ✔✔This may
include surfactants, spreaders, wetting agents, colorant dyes, buffers (to adjust pH),
antifoaming agents, and safeners.
EXAM QUESTIONS AND SOLUTIONS GUARANTEE A+
✔✔WSDA administers several rules to protect bees and beneficial organisms. -
✔✔There are also rules to reduce off target drift and the potential for groundwater
contamination.
✔✔Some items subject to specific regulation in WA state include: - ✔✔-applications of
many insecticides to alfalfa, clover, mint, and corn;
-use of encapsulated methyl parathion;
-applications of phenoxy hormone type herbicides, dessicants, and defoliants in Eastern
Washington;
-restricted use classifications of some products that pose concerns for groundwater;
-secondary containment of liquid bulk pesticides,
-and general safety requirements for chemigation;
✔✔Applications to aquatic environments: - ✔✔WSDA has designated all pesticide
formulations label for application onto or into water state restricted use. Only certified
applicators with the private or aquatic license endorsement can purchase or use these
products (unless used under their direct supervision). A permit must also be issued by
the department of ecology to any person for the application of pesticides to water. The
only exception is the application of copper sulfate for algae control by a water supply
system agency for control in that agencies' water supply waters.
✔✔The EPA: - ✔✔regulates pesticide and environmental issues at a federal level
✔✔The FDA: - ✔✔monitors pesticide residues on or in the nation's food supply
✔✔The Occupational Safety and Heath Administration (OSHA): - ✔✔regulates worker
safety issues
✔✔The Federal Aviation Administration (FAA) - ✔✔regulates the use of aircraft in aerial
applications.
✔✔The US Department of Transportation (DOT): - ✔✔regulates interstate
transportation issues.
✔✔WA: Emergency Management Division (EMD): - ✔✔handles crisis spills and leaks
✔✔WA: Department of Ecology (Ecology): - ✔✔regulates environmental issues caused
by pesticides, such as spills, contamination, aquatic applications, hazardous wastes,
and disposal.
, ✔✔WA: Department of Labor and Industries (L&I): - ✔✔regulates employee safety
issdues, worker right-to-know regulations, worker protection standards, and
cholinesterase monitoring.
✔✔WA: Department of Health (DOH): - ✔✔handles health issues.
✔✔WA: Department of Community, Trade and Economic Development (CTED): -
✔✔regulates community right-to-know issues.
✔✔WA: Washington State Patrol (WSP): - ✔✔handles intrastate transportation issues
by private carriers.
✔✔WA: Washington Utilities and Transportation Commission (WUTC): - ✔✔handles
intrastate transportation issues by commercial carriers.
✔✔Active ingredient: - ✔✔the actual chemical in the product mixture that controls the
pest.
✔✔Inert ingredient: - ✔✔other materials added with the AI when the product is
formulated.
✔✔Pesticide Formulation: - ✔✔The mixture of active and inert ingredients.
✔✔Phyotoxicity: - ✔✔Plant damage.
✔✔Adjuvant: - ✔✔product added to a spray tank to assist pesticide in its application.
✔✔Calculating the amount of an AI in a dry formulation: - ✔✔requires multiplying the
weight of the product by the percent of the active ingredient.
✔✔Calculating the amount of an AI in a liquid formulation: - ✔✔requires multiplying the
weight of the AI per gallon by the volume of product. It is necessary to know how much
AI is present per gallon instead of just the percent of the product that is an AI. This
number is present in the active ingredient statement.
✔✔Why add inert ingredients? - ✔✔-For ease of pesticide handling
-Inerts make measuring and mixing pesticides easier.
-To increase safety of a formulation.
-Makes the AI work better (better penetration, more selectivity, increased effectiveness).
✔✔Labels will often recommend the addition of adjuvants to the tank mix. - ✔✔This may
include surfactants, spreaders, wetting agents, colorant dyes, buffers (to adjust pH),
antifoaming agents, and safeners.
