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MS4 Documents Library

In Oak Lodge, storm water runs directly into local ditches, creeks and rivers without treatment. The MS4 Permit supports water quality efforts.

MS4 stands for "Municipal Separate Storm Sewer System", and is a regulatory permit required by the Oregon Department of Environmental Quality (DEQ) under the National Discharge Elimination System (NPDES). OLWS partners with Clackamas County and 11 co-permittees to implement the Phase i MS4 Permit in our area. Oregon DEQ bases the requirements in part on the Water Quality Status and Trends Analysis. The permit requires human efforts to keep pollution out of waters of the state.

The MS4 Permit requires the creation of a Stormwater Management Plan (SWMP) with activities designed to reduce pollutants in storm water runoff.  

Requirements include programs for:​

  • Illicit Discharge Detection and Elimination
  • Regulation of Industrial and Commercial Facilities
  • Construction Site Runoff Control
  • Education and Outreach
  • Public Involvement and Participation
  • Post Construction Site Runoff
  • Pollution Prevention for Municipal Operations
  • Stormwater Management Facility Operation and Maintenance
  • Hydromodification Assessments
  • Stormwater Retrofit Strategies
  • Water Quality Monitoring and Reporting
  • Annual Reporting
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