Stormwater Program

Stormwater Program


Stormwater drains in the CWS service area lead to local streams or the Tualatin River, and our actions have a direct impact on the watershed. Dumping or routing wastewater or other contaminants into the stormwater drainage system is prohibited by our Nondomestic Waste Ordinance 42. 

The goal of our industrial and commercial stormwater program is to reduce pollutant loads in stormwater runoff to the Tualatin River Watershed by focusing on source control Best Management Practices.

Industrial Stormwater Discharge Permit

Based on federal regulations, industrial facilities that discharge stormwater from their industrial areas to surface waters or to storm drains that discharge to surface waters must have National Pollutant Discharge Elimination System (NPDES) permit coverage. 

Our Environmental Services program manages a portion of this NPDES program through an agreement with the Oregon Department of Environmental Quality (DEQ). Specifically, we administer the DEQ NPDES 1200-Z General Permit within our service area. If your industrial facility falls under the scope of these regulations, you need to apply for this permit through Environmental Services to discharge stormwater associated with industrial activities to the surface water system. See the Code of Federal Regulation part 122.26 (b)(14) or Table 1 of the 1200-Z General Permit for a list of industrial facilities that are required to obtain this permit.


Clean Water Services 
Environmental Services Program 

DEQ Forms

Water Quality Facilities

Clean Water Services and its partner cities have initiated a program to regularly inspect and support maintenance of privately owned water quality facilities. These facilities are constructed to protect precious water resources by removing pollution from stormwater runoff. Water quality facilities are required by law and must comply with Clean Water Services’ municipal stormwater (MS4) permit and DEQ regulations.

  • Learn more about design and function of water quality facilities, preferred inspection, and maintenance practices.