Eastern Washington Phase II Municipal Stormwater Permit

We develop and administer Clean Water Act National Pollutant Discharge Elimination System (NPDES) municipal stormwater permits in Washington. The permit requires local governments to manage and control polluted stormwater runoff so that it does not pollute downstream waters.

The Eastern Washington Phase II Municipal Stormwater Permit covers 18 cities and portions of six counties. Find a list of cities and counties covered by this permit.

The current permit went into effect Aug. 1, 2014 and expires July 31, 2019. We are in the process of re-issuing this permit.

Eastern Washington Phase II Municipal Stormwater Permit

Supporting documents

Municipal stormwater permit history

To access previous permits and learn about past permit cycle processes, such as appeals, public comments, draft reviews, etc., see municipal stormwater history.

Municipal stormwater permit guidance

Eastern Washington Phase II Permit Timelines Overview (2014-2019)

For guidance about applying, changing, or implementing and complying with your municipal stormwater permit see municipal stormwater guidance. Stormwater manuals provide stormwater permit implementation and management guidance.

For more general stormwater permit guidance, see the stormwater guidance page.

Frequently asked questions

Have a question? Check out our frequently asked questions page

Stormwater monitoring

How well do our permits prevent and reduce pollution from stormwater runoff? Check out the Stormwater Action Monitoring (SAM) program and our other results on our stormwater monitoring page.

Keep in touch with us

To receive email updates about this permit, join the Eastern Washington Phase II Municipal Stormwater Permit listserv.