City of Merced, CA
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The Wastewater Treatment Facility (WWTF) is comprised of four divisions: plant operation and maintenance, Sewer, Water Quality Control (WQC) and laboratory, and Land Application site.
Plant operation treats all raw sewage coming into the WWTF, with maintenance keeping pumps, valves, and equipment in working condition.
The Sewer System is comprised of numerous pipes that flow to the Wastewater Treatment Facility. Amazingly, the whole system relies primarily on gravity for flow. Once sewer main lines are too deep, approximately 15 feet, a lift station pumps water to a shallow line, where the process starts again.
The WQC Division regulates sewer and storm drain discharge from industrial companies, monitors ground water contamination from these companies as well as the treated sewage that is discharged from the WWTF, and educates the public on proper disposal of contaminates such as oil, paint, and grease.
In the monitoring of ground water contamination, environmental control officers take samples from various monitoring wells. These samples are tested by the WWTF laboratory as well as outside laboratories as part of a checks and balance. The WWTF laboratory also tests samples taken from various points of the water distribution system, as well as from contractors tying into our distribution system, to ensure our drinking water is free from contaminants.
The Land Application site grows animal food crops. Irrigation for these crops was once supplied by tomato wastewater from the Unilever site; however, Unilever has since closed. WWTF is currently looking into other water sources for these food crops. The animal food crops are sold to local farmers.