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Aquatic Mosquito Control National Pollutant Discharge Elimination System State Waste Discharge General Permit

Since 2001, and based on the Headwaters v. Talent Irrigation District ruling, the Washington State Department of Ecology (Ecology) has maintained discharges of pesticides to waters of the state require coverage under a National Pollution Discharge Elimination System (NPDES) permit. The Aquatic Mosquito Control General Permit (Permit) has covered discharge of larvicides since 2002 but has not covered discharges from adulticide use. Until the issuance of the 2010 Permit, Ecology had prepared a draft administrative order allowing discharge of adulticides to waters of the state in case of a human health emergency due to West Nile Virus.

The challenge of the Permit issued in 2010 is Ecology's attempt to strike a balance between the health of the environment and human health. Both are extremely important issues and very complex. To meet this challenge, Ecology worked with an advisory group of individuals (some of whom are Permittees) who work in the fields of mosquito control, human health, and state environmental and pesticide regulation while drafting the 2010 permit.

IN 2015, Ecology issued an updated Permit to allow the use of larvicides and adulticides for controlling mosquitoes in Washington State.