Regulations & Permits - Washington State Department of Ecology

Irrigation System Aquatic Weed Control permit

This permit regulates the use of pesticides to manage plant and algae growth in irrigation systems.

https://ecology.wa.gov/regulations-permits/permits-certifications/aquatic-pesticide-permits/irrigation-system-aquatic-weed-control

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

Beneficial Use Determination registry

List of all pending or approved beneficial use determinations.

https://ecology.wa.gov/regulations-permits/permits-certifications/solid-waste-permits/beneficial-use-determinations/beneficial-use-determinations-registry

Health impact review of toxic air pollution

We must review new projects that emit toxic air pollutants.

https://ecology.wa.gov/regulations-permits/permits-certifications/air-quality-permits/notice-of-construction-permit/health-impact-assessments-of-toxic-air-pollutants

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

Phase I Municipal Stormwater Permit

This permit regulates stormwater discharges in the most highly populated areas in Washington.

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

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

Western Washington Phase II Municipal Stormwater Permit

Permit regulates stormwater discharges in the 2nd-most highly populated areas in Western Washington.

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

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

Changes to existing water rights

If you want to change to an existing water right, we recommend a pre-application consultation.

https://ecology.wa.gov/regulations-permits/permits-certifications/water-right-permits/changes-to-existing-water-rights

Overview of permitting & certifications

Find information on how to get a permit or certification from Ecology.

https://ecology.wa.gov/regulations-permits/permits-certifications/overview-of-permitting

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 quality permits

Permits for industrial air pollution and burning activities.

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

Aquatic pesticide permits

Find information about the various aquatic pesticide permits used in our state.

https://ecology.wa.gov/regulations-permits/permits-certifications/aquatic-pesticide-permits

Certified water right examiner certification

We share information to help you gain or maintain your certified water right examiner certification.

https://ecology.wa.gov/regulations-permits/permits-certifications/certified-water-right-examiner

Washington's biosolids permit system

Help for operators with permit applications, and those managing permit coverage, including modifications.

https://ecology.wa.gov/regulations-permits/permits-certifications/biosolids-permit-system

Bridge & Ferry Terminal Washing Permit

This permit protects water from cleaning and painting activities at bridges and ferry terminals.

https://ecology.wa.gov/regulations-permits/permits-certifications/bridge-and-ferry-terminal-washing-permit