A combined sewer overflow (CSO) refers to a discharge of partially treated or untreated waste water prior to treatment. CSO's generally occur in response to wet-weather events.
Combined sewer overflows occur far less frequently than they did in the past. For information regarding improvements Milwaukee Metropolitan Sewerage District (MMSD) has made to the regional collection system in an attempt to reduce overflows, please access their resource.
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The area approximately east of NorthOakland Avenue is served by a combined sewer system. Geographically, approximately 1/2 of the Village of Shorewood is served by a combined sewer system. North Oakland Avenue is the approximate line dividing the sewer service areas of the Village (see a map (PDF)).
Any amount of water removed from the system during wet-weather events helps. The disconnection of downspouts and the installation of rain barrels minimize the impact of rainwater on the combined sewer system. Learn more about using rain barrels and where to purchase them.
Read about Shorewood's recent successful partnership with Milwaukee Metropolitan Sewerage District (MMSD) to encourage residents to disconnect downspouts and install rain barrels and rain gardens.