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In California, our water is treated under the State Department of Health Services requirements as specified in Title 17 and Title 22 of the California Health and Safety Code and Chapter 7 of the California Safe Drinking Water Act. The State requires the District to periodically test the water and report the results to its customers.
Our water is taken from the Cosumnes River at Granlees Dam and pumped into Calero, Chesbro and Clementia Reservoirs from November 1st until May 31st of each year. The stored water is used throughout the year for the needs of the community. These reservoirs work as large settlement basins before the water is transferred to the Water Treatment Plant at the foot of the Lake Chesbro Dam.
The location and type of Water Treatment Plant was dictated by physical constraints, location of the reservoirs, available land, and quality of the stored water. The first treatment facilities in the early 1970’s consisted only of chlorination. In 1978, 1.5 MGD capacity was constructed to meet the increased demands of development and upgraded treatment requirements. In 1987, a duplicate plant with 2.0 MGD capacity was constructed. The treatment process is comprised of screening coagulation, flocculation, sedimentation, followed by filtration and finally disinfection. Both of these plants were retrofitted in 1995 to meet the new Surface Water Treatment Rules.
The very high quality water you receive is due to the process used by the filters to meet water quality and quantity to meet the needs of the community. The filters are designed with sand and anthracite coal beds that remove any solids and most taste and odors from the water as well as microscopic bacteria and organisms.