Wastewater Treatment

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The City of San Luis Obispo’s Water Resource Recovery Facility (WRRF) is responsible for treating all of the wastewater (sewage) within the City, Cal Poly and the County airport. The facility treats 4.5 million gallons of wastewater daily, twenty four hours a day, 365 days a year. Staffing of operators, laboratory analysts and maintenance technicians ensure the WRRF is operated and maintained in the most efficient manner possible and complies with federal state and local discharge requirements.

The most recent upgrade to the WRRF was completed to improve the quality of water discharged into San Luis Obispo Creek. The WRRF has very stringent discharge requirements and now produces a high quality effluent that surpasses drinking water standards for many constituents. Plans to utilize a portion of this effluent to irrigate parks, median strips, landscape and other appropriate uses are being implemented under the City’s Water Reuse Program.

The City of San Luis Obispo has a long history of treating wastewater. During the 1920’s, the City constructed one of the first sewage treatment plants in the state and has continued to improve the facility over the subsequent years by increasing capacity and improving the quality of the effluent discharged into the environment. The City is committed to ensuring water quality in the most efficient and effective manner possible.  Please visit the links below to learn more about the WRRF.

Wastewater Treatment Plant History


WRRF Upgrade Project


 WRRF Tour