Aquatic Mosquito Control General Permit

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

We issue this permit to allow the discharge of insecticides into state waters to control mosquitoes. It is a combined National Pollutant Discharge Elimination System (NPDES) and State Waste Discharge General Permit.

Mosquito control programs are important to public health. They are multifaceted and include surveillance, source reduction, and a variety of methods to control larval and adult mosquitoes. The use of pesticides to manage mosquito populations is controlled by many agencies and regulations. In addition to Ecology’s Aquatic Mosquito Control General Permit, the following are examples of agencies and laws that regulate the use of pesticides to control mosquito populations.

  • Federal Environmental Protection Agency
  • Washington State Department of Agriculture
  • Federal Insecticide, Fungicide, and Rodenticide Act
  • Washington Pesticide Control Act
  • Washington Pesticide Application Act
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Current Permit and related documents

Permit Reissuance - 2019

We propose to reissue the current permit to authorize the use of an additional tool — deltamethrin — to control mosquitoes in Washington. Other proposed revisions include updates to reporting requirements and edits to improve the readability of the permit.

Formal Draft Documents

Public Comment Period

Your review of, and comments on, this permit are important. We invite comments on the revised permit documents beginning March 6, 2019, through 11:59 p.m. on April 19, 2019. We will publish a Response to Comments as an appendix to the Fact Sheet, to address comments submitted during the public comment period.

You may provide comments to Ecology using any of the following options:
Online eComments form (preferred option)
By Mail - send comments to:
                     Stacey Callaway
                     Washington State Department of Ecology
                     PO Box 47696, Olympia, WA  98504-7696
At hearings - you may give testimony at either of the public hearings

Workshops and hearings

We will host a workshop immediately followed by a public hearing. During the workshops, we will explain the proposed revisions and answer questions prior to the hearing. During the hearing, the public may give oral testimony and written comments on the permit. Written comments will receive the same consideration as oral testimony. Information about the workshops and hearings is included below.

Tuesday April 9, 2019, at 9:30 a.m. - Webinar hearing
Ecology is offering this hearing via webinar. Register to join this webinar.

Wednesday April 10, 2019, at 10:00 a.m.  In-person hearing
We are hosting an in-person hearing at the Central Washington University. Directions and parking information.

        Central Washington University
        Student Union & Recreation Center, Room SURC 137A
        1007 North Chestnut, Ellensburg, WA

Reissuance timeline

We will make the final decision on the revised permit after we consider all public comments. If public comments cause a substantial change in the permit conditions from the original draft revised permit, we may provide another public notice of a draft and comment period.

March 6, 2019      Start of public comment period - draft permit available
April 19, 2019       Close of public comment period - deadline to submit comments
Summer 2019       Issue revised permit
Summer 2019       Revised permit is effective 

Revisiones al Permiso

Ecología propone reemitir el Permiso General para el Control de Mosquitos Acuáticos. El Permiso General para el Control de Mosquitos Acuáticos es un permiso del Sistema Nacional para la Eliminación de Descargas de Contaminantes (NPDES por sus siglas en inglés) y un Permiso Estatal para Descargar Aguas Residuales. El permiso autoriza condicionalmente las descargas de larvicidas y las descargas indirectas de adulticidas a las aguas superficiales del estado de Washington, para el control de los mosquitos.

Para obtener más información, comuníquese con Stacey Callaway al 360-407-7118. Para información en español, comuníquese con Gustavo Ordóñez al 360-407-6619.

Additional documents