Municipal Permit Information
Welcome to Municipal Permit Information. We focus on assisting those with the following permits:
- Phase I Municipal Stormwater Permit
- Western Washington Phase II Municipal Stormwater Permit
- Eastern Washington Phase II Municipal Stormwater Permit
Phase I and Phase II Permit and Manual Modifications
2012 Errata sheet for the SWMMWW (as amended in 2014)
Save paper and use the Interactive 2014 SWMMWW Manual
We are here to help. Can't find what you need to help with your stormwater management? Email us. Also be sure to check Ecology's Municipal Stormwater General Permit webpage.
For non-Municipal Permits, please click here.
MS4 Phase II major program component Timelines Overview
Need assistance with major permit requirement timelines? Here's the overviews from the Department of Ecology: