Regulations & Permits - Washington State Department of Ecology

We provide guidance for developing and implementing municipal stormwater management programs.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/stormwater-permittee-guidance-resources/municipal-stormwater-permit-guidance

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

Guidance for contaminated water on construction sites

Information on how to manage contaminated water on construction sites.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/stormwater-permittee-guidance-resources/contaminated-water-on-construction-sites

Mint Farm Electricity Cogeneration Facility

We regulate water and hazardous waste for PSE's Mint Farm electricity cogeneration facility.

https://ecology.wa.gov/regulations-permits/permits-certifications/industrial-facilities-permits/mint-farm

Sonoco Paper Mill

We regulate water and hazardous waste activities at Sonoco Products Company in Sumner.

https://ecology.wa.gov/regulations-permits/permits-certifications/industrial-facilities-permits/sonoco

Specialty Minerals, Longview

We regulate water and hazardous waste at the Specialty Minerals chemical plant in Longview.

https://ecology.wa.gov/regulations-permits/permits-certifications/industrial-facilities-permits/specialty-minerals-longview

Construction Stormwater General Permit eCoverage Packet

The Construction Stormwater General Permit is switching from paper copies to an electronic packet.

https://ecology.wa.gov/regulations-permits/permits-certifications/stormwater-general-permits/construction-stormwater-permit/ecoverage-packet

Stormwater Action Monitoring communications

You can find SAM Booklet, fact sheets and videos on this page.

https://ecology.wa.gov/regulations-permits/reporting-requirements/stormwater-monitoring/stormwater-action-monitoring/communications

Industrial Stormwater General Permit eCoverage Packet

The Industrial Stormwater General Permit is switching from paper copies to an electronic packet.

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

Construction stormwater general permit history

CSWGP documentation from previous permit reissuance and appeals processes.

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

Municipal stormwater permit reissuance

Information about the reissuance of Western and Eastern Washington Municipal Stormwater permits.

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

Western Washington Hydrology Model

Western WA Hydrology Model models most hydrologic conditions for stormwater control and design.

https://ecology.wa.gov/regulations-permits/guidance-technical-assistance/stormwater-permittee-guidance-resources/stormwater-manuals/western-washington-hydrology-model

Eastern Washington Phase II Municipal Stormwater Permit

This permit regulates stormwater discharges in urbanized areas of Eastern Washington.

https://ecology.wa.gov/regulations-permits/permits-certifications/stormwater-general-permits/municipal-stormwater-general-permits/eastern-washington-phase-ii-municipal-stormwat-1

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

Hydrologic performance of bioretention

Study of the oldest bioretention facilities to evaluate infiltration performance.

https://ecology.wa.gov/regulations-permits/reporting-requirements/stormwater-monitoring/stormwater-action-monitoring/sam-effectiveness-studies/bioretention-infiltration

Puget Small Streams study

Stormwater Action Monitoring's (SAM) receiving waters study on Puget Sound's small streams.

https://ecology.wa.gov/regulations-permits/reporting-requirements/stormwater-monitoring/stormwater-action-monitoring/sam-status-and-trends/puget-small-streams

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

Mobile business stormwater source control and coordination

We're developing and testing new tools to help mobile businesses control stormwater pollution.

https://ecology.wa.gov/regulations-permits/reporting-requirements/stormwater-monitoring/stormwater-action-monitoring/sam-source-identification/mobile-business-source-control

Lower Columbia urban streams

This monitoring is funded by the municipal stormwater permittees in Clark and Cowlitz counties.

https://ecology.wa.gov/regulations-permits/reporting-requirements/stormwater-monitoring/stormwater-action-monitoring/sam-status-and-trends/lower-columbia-urban-streams