Thompson Builders Corporation Completes $18.8M Wastewater Treatment Plant in St. Helena, CA
Thompson Builders Corporation has finalized the construction of a new $18.8 million wastewater treatment facility for the City of St. Helena, CA. The facility features a modern membrane bioreactor (MBR) system that complies with regulatory standards following a 2016 order from the San Francisco Bay Regional Water Quality Control Board. The MBR system processes 500,000 gallons of wastewater daily and integrates biological treatment with membrane filtration.

Thompson Builders Corporation has completed the $18.8 million wastewater treatment facility for St. Helena, CA, featuring a modern membrane bioreactor (MBR) system. This facility replaces the original 1960s-era plant and meets regulatory compliance mandated by the San Francisco Bay Regional Water Quality Control Board in 2016.
The MBR system treats 500,000 gallons of wastewater daily, providing high-quality effluent. Treated water is discharged to the Napa River or reused for irrigation. The project included installation of various systems and improvements to enhance operational efficiency and environmental compliance.




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