05/21/2024

Aquatic Mosquito Control General Permit

Industry News

Today, Ecology is issuing the revised Aquatic Mosquito Control general permit. The previous permit was issued in June 2019 and is scheduled to expire July 4, 2024. Ecology has worked with numerous permittees, as well as staff at WSDA, DOH and WDFW during the development of the new permit. The revised permit and associated documents are available on the permit web site: https://ecology.wa.gov/ mosquitopermit. The new permit becomes effective on June 20, 2024, and expires on June 20, 2029.

Purpose of the Permit

This permit provides statewide coverage for the use of specific insecticides to control mosquitoes. Businesses and government entities that apply either mosquito larvicides or adulticides to waters of the State must obtain permit authorization for their discharge. This permit does not apply to homeowner use of insecticides for residential control of mosquitoes.

Public Notice Process and Comments

Ecology accepted public comments on the draft permit from November 15, 2023, through December 29, 2023. Ecology held public workshops and hearings via online webinars on December 19, 2023, and December 20, 2023. Ecology received written and emailed comments during the public comment period. The comments and Ecology’s responses are included in Appendix B of the Fact Sheet, available on the permit web page.