Water Quality Permits

MS4 Phase II General Permit

As part of its efforts to protect and improve Oregon's water quality, DEQ issues stormwater discharge permits to small municipal storm sewer systems that discharge stormwater into streams, rivers, lakes and streams. DEQ currently regulates municipal stormwater discharges from 19 regulated small MS4s under “Phase II” MS4 individual permits. In 2017 DEQ proposed to permit existing and future Phase II communities under a general permit, the MS4 Phase II Stormwater general permit.

Current Action

The public comment period for the proposed MS4 Phase II Stormwater general permit ended Feb. 20, 2018. DEQ is currently reviewing and preparing responses to the comment received. Once DEQ has established a timeline for issuing the permit information will be posted here and emailed to interested parties. Sign up for updates about DEQ’s MS4 permitting program by sending an email here, with your name, affiliation and email address.

Public Notice Documents

includes the request for comments, draft permit, and permit evaluation.
​On July 1, 2016 DEQ posted a proposed MS4 Phase II general permit for public comment. DEQ hosted a Public Hearing associated with the permit on Aug. 3, 2017. The formal comment period ended Sept. 2, 2016.
​In July 2016 DEQ posted the draft MS4 Phase II general permit for public notice and received 250 separate comment documents or oral testimonies. Based on several requests received, DEQ hosted two facilitated listening sessions to further explore issues raised during the public process.

Dec. 6, 2016
Feb. 7, 2017
​DEQ convened an Advisory Committee associated with the development of a MS4 Phase II general permit. The committee helped identify issues, provide feedback on implementation timelines and regional issues.

Meeting 7: May 10, 2016 Meeting 6: Nov. 19, 2015 Meeting 5: Nov. 4, 2015 Meeting 4: Sept. 24, 2015 Meeting 3: July 9th, 2015
​Identified are the 19 Phase II communities, and the seven new communities that will require coverage.

City of Albany*   
City of Ashland   
City of Bend   
City of Corvallis   
City of Eagle Point*   
City of Gold Hill**   
City of Grants Pass*  
City of Jefferson **   
City of Keizer   
City of Medford   
City of Millersburg*   
City of Milton-Freewater**   
City of Philomath   
City of Rogue River*   
City of Springfield   
City of Tangent**   
City of Troutdale   
City of Turner
City of Wood Village   
Benton County

Josephine County*

Lane County
Linn County*
Marion County
Polk County
Umatilla County** 
Rogue Valley Sewer Services - RVSS  
RVSS - City of Central Point
RVSS - City of Phoenix
RVSS - City of Talent
RVSS - Jackson County
*New Urbanized Areas identified based on 2010 US Census data. Communities are automatically designated for coverage by EPA and notified by DEQ.
** New Urbanized Areas identified based on 2010 US Census data. Community applied for waiver of coverage and DEQ approved request.

​Stormwater runoff is generated when precipitation from rain and snowmelt flows over land or impervious surfaces and does not percolate into the ground. As runoff flows over land and impervious surfaces in urbanized areas (such as paved streets, parking lots and building rooftops), it can accumulate chemicals, nutrients, sediment or other pollutants in quantities that could adversely affect water quality. If stormwater runoff discharges from MS4s that serve these urbanized areas, and the runoff is untreated or allowed to accumulate pollutants, it may adversely affect local aquatic life and beneficial uses of water such as swimming, fishing and drinking water.

If you are interested in receiving updates about the Phase II General Permit development, please email your name, affiliation and email address.