overflows

Environment
1:38 pm
Tue October 11, 2011

Keeping sewage out of Puget Sound

Heavy rains can exceed the capacity of combined sewer/stormwater drainage systems, causing raw sewage to flow into local waterways
City of Seattle

It's a dirty topic with a refined name: Combined Sewer Overflows (CSOs). When heavy rains exceed the capacity of Seattle's century-old drainage system, raw sewage gets dumped into our rivers, lakes and Puget Sound.

Seattle Public Utilities (SPU) is developing a Long-Term Control Plan for limiting CSOs to no more than one outfall per year.

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