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Prescott warns WI DNR of lower CMAR score after SV Labs discharge; company corrected issues and was fined
Summary
City Administrator Matt Wolf reported that Prescott’s wastewater CMAR score dropped to 2.34 in 2025 from 3.66 in 2024 due primarily to high-strength discharges from SV Labs; Wolf said SV Labs has returned to compliance and was assessed penalties under the industrial sewer agreement. The council approved Resolution 32-26 to inform the WI DNR.
City Administrator Matt Wolf presented the city’s annual Compliance Maintenance Annual Report (CMAR) for the Prescott Wastewater Treatment Plant (WPDES Permit No. 0022403). Wolf said the plant’s overall score fell to 2.34 out of 4.00 for 2025 from 3.66 in 2024. He attributed the decline primarily to high-strength wastewater discharges from SV Labs between July and September 2025, which adversely affected biological oxygen demand, total suspended solids and phosphorus removal.
Wolf said the city had previously authorized discontinuation of sewer service if SV Labs failed to comply; the company has corrected the discharge issue and returned to compliance, and the city assessed penalties under the industrial sewer agreement. Wolf warned that if performance does not improve in the future, the Wisconsin Department of Natural Resources (WI DNR) could require a formal compliance plan. The council voted to approve Resolution 32-26 to inform the WI DNR; no member opposed the motion.
Ending: The resolution transmits the CMAR to the WI DNR; the city will monitor plant performance and pursue compliance remedies if necessary.
