Regulations & Permits

Use this portal to filter and search for all of our regulatory information.

We oversee many state and federal laws designed to protect Washington's land, air, and water. See our laws, rules, & rulemaking page for more information about our current rules and rulemaking.

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Municipal stormwater permit history

We document the development of municipal stormwater permits in Washington.

https://ecology.wa.gov/regulations-permits/permits-certifications/stormwater-general-permits/municipal-stormwater-general-permits/municipal-stormwater-permit-history

Washington Department of Transportation Municipal Stormwater Permit

Permit covers discharges from state highways and other WSDOT transportation-related facilities.

https://ecology.wa.gov/regulations-permits/permits-certifications/stormwater-general-permits/municipal-stormwater-general-permits/wsdot-municipal-stormwater-permit

Evaluation of Best Management Practices Maintenance Conditions

Study evaluating the maintenance thresholds for select best management practices for stormwater.

https://ecology.wa.gov/regulations-permits/reporting-requirements/stormwater-monitoring/stormwater-action-monitoring/sam-effectiveness-studies/bmp-maintenance-conditions

Clean Water Act: Section 401 Water Quality Certifications

Under the Clean Water Act, we help make sure projects, actions, and activities don't harm state waters.

https://ecology.wa.gov/regulations-permits/permits-certifications/401-water-quality-certification

Air operating permit for large sources of air pollution

Air operating permit requirements for large sources of air pollution.

https://ecology.wa.gov/regulations-permits/permits-certifications/air-quality-permits/air-operating-permit

Burrowing shrimp control (Imidacloprid)

We are denying a request to use imidacloprid on shellfish beds in Willapa Bay & Grays Harbor.

https://ecology.wa.gov/regulations-permits/permits-certifications/aquatic-pesticide-permits/burrowing-shrimp-control-imidacloprid

Combined sewer overflows

We're working to control combined sewer overflows to keep water clean.

https://ecology.wa.gov/regulations-permits/permits-certifications/combined-sewer-overflows

Zostera japonica management on commercial clam beds in Willapa Bay general permit

This permit allows the use of an herbicide to control non-native eelgrass in Willapa Bay.

https://ecology.wa.gov/regulations-permits/permits-certifications/aquatic-pesticide-permits/zostera-japonica-eelgrass-management

Industrial Stormwater General Permit

Find information and helpful resources about the Industrial Stormwater General Permit.

https://ecology.wa.gov/regulations-permits/permits-certifications/stormwater-general-permits/industrial-stormwater-permit

Bonneville Power Administration TSD permit (PDF)

A permit issued in 2011 allowing the Bonneville Power Administration to treat, store and dispose of dangerous waste.

https://ecology.wa.gov/bonneville-power-administration-tsd-permit

ECY to Pend Oreille County regarding SEPA lead request

ECY response to Pend Oreille County Commissioners' letter requesting Ecology take the lead agency role in Environmental review of PacWest Silicon’s proposal

https://ecology.wa.gov/ecy-to-po-commissoners_lead-ag_july2018

7Q10 for High Flows on the Columbia/Snake Rivers

Guidelines for arriving at 7Q10 for dissolved gas standards.

https://ecology.wa.gov/7q10forhighflows

Air Operating Permit Report for Fiscal Years 2022 and 2023, updated November 2021

This is the workload analysis and budget report for the Air Operating Permit Program for Fiscal Years 2022 and 2023, updated November 2021.

https://ecology.wa.gov/202111aopreportfy22

Field Nutrient Budget Template

Template for submitting CAFO annual reports

https://ecology.wa.gov/field-nutrient-budget-template

Technical Support Document - Small Water Heaters and Steam-Generating Boilers

Technical support document for general order for small water heaters and steam-generating boilers

https://ecology.wa.gov/genorder_boiler_background

Technical Support Document - Perchloroethylene Dry Cleaners

Technical supplement document for general order for perchloroethylene dry cleaners using less than 2100 gallons per year

https://ecology.wa.gov/drycleanerengineerstsd

Technical Support Document - Gas-Powered Emergency Generators

Technical support document for general order for gas-powered emergency electrical generators

https://ecology.wa.gov/gasemergencygeneratortsd

General Order - Perchloroethylene Dry Cleaners

General order for perchloroethylene dry cleaners using less than 2100 gallons per year

https://ecology.wa.gov/finaldry_cleaners_order

General Order - Gas-Powered Emergency Electrical Generators

General order for gas-powered emergency electrical generators

https://ecology.wa.gov/finalgas_firedgenerators_order

General Order - Auto Body Shops

General order for auto body repair and refinishing shops

https://ecology.wa.gov/genorderbodyshops