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Combined Sewer Overflows (CSOs)

Implement a Combined Sewer Overflow (CSO) Plan to Achieve Highest Water Quality at Lowest Cost Within Shortest Time Frame

  • Implement refined CSO Plan by November 2007 – achieves 90% separation of City’s total sewer system by separating two full basins (Greensferry and McDaniel) and one sub-basin (Stockade); also eliminates two CSO facilities

  • Construct tunnel storage and treatment system to capture and treat 99% of the sewage and 85% of stormwater from remaining combined area

  • Reduce overflows from 60+ per year at existing CSO facilities to an average of four per year at the four remaining CSO facilities (from more than 300 to an average of 16)

  • Lower cost and higher water quality than full separation and original authorized plan
  • Plan provides for treatment of stormwater within combined sewer area

What is a Sanitary Sewer System | Typical Sanitary Sewer Problems
CSO Facility Tour




 
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