Combined Sewer Overflows: discharges from a combined sewer in excess of the interceptor or regulator capacity, that are discharged into a receiving stream rather than going to a treatment plant.
CSO
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ALERT: With many StL area stores changing hours, some MSD bill pay locations may be impacted. You can still pay your wastewater bill via the lobby drop box at 2350 Market St. (M-F, 8:30am – 4:30pm), at Pay Online, or by calling 866-281-5737.