Oregon Stormwater-Municipalities regulations & environmental compliance analysis

Oregon Stormwater-Municipalities: What you need to know

Governing Law and Regulations
Regulatory Agencies
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Oregon Department of Environmental Quality (DEQ)Water Quality Division

Local land-use authorities

U.S. Environmental Protection Agency (EPA)Region 10

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Oregon is authorized by the U.S. Environmental Protection Agency (EPA) to administer the federal National Pollutant Discharge Elimination System (NPDES) permit program for wastewater discharges, including permitting authority for stormwater discharges associated with municipal separate storm sewer systems (MS4s). The state generally follows the federal rules for NPDES stormwater permits, and has additional requirements including application and annual fees for stormwater permits. See the national section STORMWATER—MUNICIPALITIES for more information on the federal MS4 permitting program.

Administration and enforcement. In Oregon, DEQ's Water Quality Division is responsible for administering the stormwater MS4 permitting program.

State Requirements

Municipal sources that must obtain NPDES 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 (UAs).

In Oregon, counties that fall within UAs but that are not covered by a Phase I permit have the option of becoming a copermittee with an adjacent Phase ...

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