Municipal Stormwater Permit


On behalf of the community, the City of Eugene manages the municipal stormwater system which is the publicly owned system of gutters, curb inlets, manholes, stormwater treatment facilities (rain gardens, swales), pipes, and ditches that ultimately discharge to receiving waterbodies including Amazon Creek and the Willamette River. Like many other cities and counties in the United States, Eugene is required by the federal Clean Water Act to obtain a National Pollutant Discharge Elimination System (NPDES) permit for discharging stormwater runoff from the municipal stormwater system into the nation’s rivers and streams. The permit, administered in Oregon by the Department of Environmental Quality (DEQ), is aimed at protecting and improving water quality and requires implementation of a broad range of stormwater pollution reduction measures as documented in a Stormwater Management Plan. The permit also requires water quality monitoring as documented in a Monitoring Plan.

The City has been implementing stormwater pollution reduction measures since its first NPDES permit was issued in 1994. The permit has been re-issued three times since then: in 2004, 2010, and most recently September 2021. With each iteration of the permit,  and at certain times between the issuance of new permits, an updated Stormwater Management Plan and Monitoring Plan are required to ensure continued compliance with changing regulations and to reflect program adaptive management over time.  

Stormwater Management Program Documents 2022

The Stormwater Management Program Document(referred to as the "SWMP") is a written summary of the updated comprehensive set of 22 best management practices the City will implement to meet the new 2021 NPDES permit and reduce stormwater pollution including: performing maintenance of the system of publicly-owned pipes, ditches, bioswales, rain gardens, and open waterways, street sweeping, seasonal leaf pick-up, winter road sanding and de-icing, erosion prevention , water quality standards for new development and redevelopment, stormwater management for commercial and industrial sites, spill response, responding to illicit discharges and activities, stormwater education and outreach, volunteer activities, tree planting, and stormwater capital improvement projects. 

The Stormwater Monitoring Plan describes the City’s monitoring objectives, strategies, sampling locations, pollutant parameters, and monitoring procedures and protocols.

Status of Program Documents

A public comment period for the draft SWMP and Monitoring Plan was held from October 10 through November 9, 2022. Comments received were taken into consideration in finalizing the documents that have been submitted to DEQ for review and approval. Public comments, City responses, and related program updates are available HERE. While the public comment period is now closed for these documents, comments are welcome anytime and will be taken into consideration for future potential program changes. Please send comments to: NPDES Permit, City of Eugene Public Works Engineering, 99 East Broadway, Suite 400, Eugene, OR 97401 or by email to:

  1. Current Stormwater Permit & Monitoring Plan
  2. Annual Reports
  3. Water Quality Data
  4. Other  Documents