Aquatic Mosquito Control General Permit

Aquatic Mosquito Control general permit

• Current Permit (effective July 5, 2019)
• Fact Sheet: Our detailed explanation of the permit
  • Appendix B: Response to public comments on the draft permit
• Interactive map (WDFW): Areas with restricted larvicide and adulticide use 
• Small Business Economic Impact Statement

Permit modification

In 2019 we reissued the permit to authorize the use of an additional tool — deltamethrin — to control mosquitoes in Washington. The 2019 permit was appealed by the Benton County Mosquito Control District. The appeal resulted in the need to modify the requirement for Endangered Species Act compliance. We plan to do this when the permit is updated in 2024.

At that time, the update process will include a public comment period and response to comments before the final permit is issued. To receive updates on the permit modification process, join our Aquatic Pesticide Permits email notification list.

Do I need a permit?

This permit is for government entities and individuals who plan to use larvicides or adulticides to control mosquitoes.This permit does not apply to homeowner use of insecticides for residential control of mosquitoes.

The application of mosquito larvicides or adulticides to Waters of the State requires permit coverage, whether it is a direct or indirect discharge. For example, a direct discharge is the application of larvicides directly to surface water, while an indirect discharge is the settling of adulticides onto a surface water even though the water was not the target area.

How do I apply for, renew, or change my permit coverage?

Apply for a permit using Secure Access Washington. Use the public notice template when applying for a new permit and complete a project SEPA Checklist.

Renew your permit coverage using Secure Access Washington.

Use the transfer form to switch coverage to another party. If you wish to cancel your permit coverage, file a notice of termination form.

Follow your permit requirements

• Check WDFW's Areas of Restricted Larvicide and Adulticide Use map, select the “Restrictions for Mosquito Control” tab above the map.
• Consult our guidance on Best Management Practices for Mosquito Control.
• Submit Annual Reports each December through Secure Access Washington.
• Product to active ingredient conversion table (Excel): Use this table to convert the amount of product used into pounds of active ingredient when reporting applications in Annual Reports.