CSO/SSO Public Notification

This page will be updated with critical information & updates when Combined Sanitary Overflows (CSO) or Sanitary Sewer Overflows (SSO) occur. 
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What is a combined sewer overflow?
A CSO (combined sewer overflow) is a discharge from a combined sewer system which is a mixture of domestic wastewater and excessive rainwater in the same pipe.  A CSO may occur during heavy rainfall events when the amount of wastewater and rain exceed the capacity of the system.
Click here to learn more about CSO.
Click here to see MDEQ's  2020 annual CSO quality report.

For more information regarding CSO, please contact:

John Simpson
Waste Water Superintendent
wwsuperintendent@nilesmi.org
 1-269-683-8015 x1210

Current & Past CSO Events

7/29/2023
Niles City Wastewater Plant had a retention basin overflow event of 8 million gallons of partially treated wastewater and undetermined amount of diluted raw sewage from Grant St. siphon. The rain event total was 2.9" in 5 hours.