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NPDES
On February 16, 2007, Cowlitz County was issued a National Pollution Discharge Elimination System (NPDES) phase II Municipal Stormwater Permit. This permit requires the County to develop and implement a Permit. This permit requires the County to develop and implement a Stormwater Management Program to reduce Management Program to reduce stormwater runoff and pollution. The area affected by the permit is the unincorporated urban area of Cowlitz County adjacent to the cities of Longview and Kelso. The areas affected by the permit are shown in green on the map below runoff and pollution. The area affected by the permit is the unincorporated urban area of Cowlitz County adjacent to the cities of Longview and Kelso. The areas affected by the permit are shown in green on the map below.

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Stormwater Management Plan - 2016 Update

Ordinance Forming Stormwater Utility

Resolution Setting Utility Rate

The Cowlitz County Stormwater Management Program is focused on six minimum measures to increase public awareness and Management Program is focused on six minimum measures to increase public awareness and stormwater stewardship. The six minimum measures include: stewardship. The six minimum measures include:


1. Public Education and Outreach

  • Identify and educate public on local impacts of stormwater runoff.
  • Distribute educational materials to the community (Brochures, Signs, Stencils).
  • Media releases.
  • Measure the results over time.

2008 Telephone Survey Results Regarding Stormwater

2010 Telephone Survey Results Regarding Stormwater 

Solution to Pollution Brochure


2. Public Involvement and Participation 

  • Seek public comments on the Stormwater Management Plan.
  • Citizen Stormwater Advisory Committee.
  • Engage citizen volunteer groups (Workshops, Stream Cleanups).
  • School programs.


3. Illicit Discharge Detection and Elimination

  • Implement regulations to prohibit illicit discharges.
  • Develop program to detect and address non-stormwater discharges
  • Establish a hotline to report illicit discharge activities
  • Map the stormwater conveyance system with outfall locations

To Report:

Spills and dumping into surface waters or storm drains or Illicit sewer and waste water connections to the stormwater drainage system, Call the Cowlitz County Department of Public Works at 360-577-3030 or the Water Pollution Hotline at 360-578-0900 OR report spills and/or dumping here.

IDDE Ordinance


4. Construction Site Stormwater Control Measures

  • Implement regulations on erosion and sediment control.
  • Site plan review procedures
  • Adopt portions of the 2005 Western Washington Stormwater Manual or an equivalent. 
  • Post Construction Stormwater Control Measures


5. Implement regulations on runoff quality and quantity.

  • Affect new development and redevelopment
  • Structural and non-structural Best Management Practices
  • Long term maintenance of Best Management Practices
  • Site inspection & enforcement procedures


6. Pollution Prevention and Good Housekeeping for Municipal Operations

  • Develop and implement an operation and maintenance program to reduce runoff pollutants from municipal operations.
  • Equipment and material storage
  • Street sweeping
  • Litter pickup
  • Fleet maintenance areas
  • Employee education and training programs


Additional Information

NPDES Phase II Municipal Stormwater Permit

NPDES Phase II Municipal Stormwater Permit - Appendix 1

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