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Oregon Department of Environmental Quality

Water Quality

 Water Quality Permit Program

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NPDES Stormwater Discharge Permits -
Phase II Municipalities

Municipal sources that need to obtain permits are classified as either "Phase I" or "Phase II" municipal separate storm sewer systems (MS4s). Phase I MS4s are those with populations greater than 100,000, while regulated Phase II (or "small") MS4s are those municipalities with populations less than 100,000 located within Census Bureau-defined urbanized areas. Federal regulations also provide EPA and the states the discretion to require other MS4s outside of urbanized areas to apply for a permit.

Phase II NPDES Municipal Separate Storm Sewer System Permit Development

DEQ is formulating a new general stormwater discharge permit to cover Phase II communities. The permit would result in more consistent environmental performance expectations than the many different individual permits DEQ issues for such communities currently. Moving to one general permit for these systems should also lead to greater clarity among communities about their permit and permit requirements, and should lead to more efficient permit processing and oversight by DEQ, ensuring better water quality protection. Through an advisory group, DEQ is working closely with communities, dischargers and others interested in water quality protection to get feedback on what the new permit would look like and how it will affect permittees. Additional information is available on the MS4 Advisory Committee web page.


Oregon Phase II NPDES Municipal Separate Storm Sewer System (MS4) Permits

City of Ashland

City of Bend

City of Corvallis

City of Keizer

City of Medford

City of Philomath

City of Springfield

City of Troutdale

City of Turner

City of Wood Village

Benton County

Lane County

Marion County

Polk County

Rogue Valley Sewer Services

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For stormwater-related questions, contact the appropriate DEQ regional office.

For general information about NPDES Stormwater Discharge Permits, contact Benjamin Benninghoff by phone at 503-229-5185 or by email .

Oregon Department of Environmental Quality
Headquarters: 811 SW Sixth Ave., Portland, OR 97204-1390
Phone: 503-229-5696 or toll free in Oregon 1-800-452-4011
Oregon Telecommunications Relay Service: 1-800-735-2900  FAX: 503-229-6124

The Oregon Department of Environmental Quality is a regulatory agency authorized to protect Oregon's environment by
the State of Oregon and the Environmental Protection Agency.

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