Wastewater Utility

Roles & Responsibilities

The Wastewater Utility provides for the collection and treatment of wastewater received from residential, commercial, and industrial uses.

Wastewater Treatment Plant

The wastewater system has 127 miles of sanitary and combined sewers ranging from 4 to 48 inches in diameter, 17 pump stations, a secondary wastewater treatment plant, and about 7,200 service connections.

The treatment plant has capacity projected to be adequate until at least 2030, and a design population of 24,800 (2010 population was 19,038, U.S. Census Bureau estimates 2013 population was 19,190). Rates are based on water usage.

Industrial Wastewater Pretreatment Program

The city’s Wastewater Utility is required by the Washington State Department of Ecology (DOE) to implement its industrial wastewater pretreatment program to comply with our National Pollutant Discharge Elimination System (NPDES) permit, and to comply with Environmental Protection Agency standards.

The Wastewater Pretreatment Program manages discharges from non-residential customers. It works to ensure that the city’s wastewater discharge does not contain excessive levels of nutrients, suspended solids, acidity or alkalinity, toxins, or heavy metals. The Wastewater Pretreatment Program uses outreach, Best Management Practices, regulations, and discharge permits to achieve these goals.

For more information please email the Source Control Specialist, or call 360-417-4692.

Combined Sewer Overflows

For more information on Combined Sewer Overflows (CSOs) please click here.