What do the CSO warning signs mean?
MSD CSO signs provide a warning of possible impurities in the water during and after a heavy rain. The signs warn people to stay away from the water. The signs also provide a phone number (314-768-6260) so residents can notify MSD of any dry-weather CSOs. Normally CSOs only occur during wet weather, so water flowing out of a CSO outfall pipe during dry weather may indicate a system problem that needs repair.
