WASHINGTON PESTICIDE LAWS AND ACTUAL FINAL
PAPER QUESTIONS AND ANSWERS 2025/2026 ALL RATED
A+
✔✔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.
✔✔When reading a brand name for a dry product, the number and letters mean what? -
✔✔The percent active ingredient by weight and an abbreviation of the formulation type.
✔✔When reading a brand name for a liquid product, the number and letters mean
what? - ✔✔The weight of the AI per gallon and an abbreviation of the formulation type.
✔✔What is a solution? - ✔✔A solution is obtained when the active ingredient, either
liquid or dry, truly dissolves in water, creating a (usually) transparent substance. The
formulations that create a solution require agitation for inital mixing, but do not require
agitation once a solution is obtained. The AI will not separate out.
PAPER QUESTIONS AND ANSWERS 2025/2026 ALL RATED
A+
✔✔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.
✔✔When reading a brand name for a dry product, the number and letters mean what? -
✔✔The percent active ingredient by weight and an abbreviation of the formulation type.
✔✔When reading a brand name for a liquid product, the number and letters mean
what? - ✔✔The weight of the AI per gallon and an abbreviation of the formulation type.
✔✔What is a solution? - ✔✔A solution is obtained when the active ingredient, either
liquid or dry, truly dissolves in water, creating a (usually) transparent substance. The
formulations that create a solution require agitation for inital mixing, but do not require
agitation once a solution is obtained. The AI will not separate out.
