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The Village of Grafton Water and Wastewater Utility experienced a Sanitary Sewer Overflow (SSO) from its collection system on Thursday, February 18, 2021. The SSO occurred near the entrance of the Village of Grafton Water & Wastewater Services Facility.
This event was noticed soon after it started by a Utility employee who observed sewage flowing out of a manhole and onto the street.
The SSO event was located on 9th Avenue approximately 50 feet north of Falls Street, and was caused by excessive grease buildup in the sanitary sewer system. Water and Wastewater Utility staff took immediate action to clear the blockage and restored the sewer to normal operation soon after the event began.
Approximately 6,000 gallons of untreated wastewater flowed onto the surface of the roadway. An estimated volume of 1,500 gallons then flowed directly into a nearby storm sewer that leads directly to the Milwaukee River, and an estimated 4,500 gallons pooled in a nearby low spot in the 9th Avenue roadway. The untreated wastewater that pooled in the low spot was promptly cleaned up with the use of a vacuum truck. The potential for human exposure is very low due to the quick response of Utility personnel.
An investigation into the origin of the grease will occur to prevent SSO events of this nature from happening in the future.
Public notification of SSO events are required by the Wisconsin Department of Natural Resources. Please contact Amber Thomas, P.E., Director of Public Works at (262) 375-5325 with questions or concerns.