Seattle Sewage Overflow Program

Seattle Combine Sewage Overflow Program

Every year, rain washes millions of gallons of untreated sewage and stormwater into the city’s waterways, threatening human and aquatic health and our quality of life. In 2010, more than 190 million gallons of combined raw sewage and stormwater spilled into our creeks, lakes, the Duwamish Waterway, and Puget Sound – creating significant health and environmental risks.

Annual overflows have been reduced from 30 billion gallons per year in 1970 to 190 million gallons in 2010. But we must finish the job in order to protect Seattle’s waterways and comply with the Clean Water Act.

Real-time reports of raw sewage overflows (updated hourly).


CSO Summary by Receiving Water 2007 – 2011 Table 9 from Seattle CSO 2011 Report


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