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Water Quality

Please click the link below for an important update about the quality of your drinking water in regards to the levels of Chromium VI. We have stopped using the well that exceeded the maximum contantaminant level and increased pumping from the others:


More information regarding Chromium VI:

USGS Contaminants Found in Groundwater

State of California Drinking Water Standards

The Los Osos Community Services District provides quality water to a population of approximately 7,086 in the communities of Los Osos and Baywood Park

(View Map of the Three Local Water Purveyors)


2018 Los Osos CSD CCR.pdf2017 Los Osos CSD CCR- Corrected July 18 2018.pdf2016 Los Osos CSD CCR_Updated.pdfLOCSD Water Quality Report 2015Water Quality Report 2014

The Los Osos Community Services District water system uses five source wells.  Water delivered to the LOCSD customers is groundwater that originates from the Los Osos Valley Basin.  The groundwater basin is a collection of local drainage basins, streams, creeks, and natural percolation from rain, agriculture, and domestic use.  Water is cleaned through a natural filtration process as it trickles down through the ground.  During this process, water may also pick up contaminants found in the soil, either naturally occurring minerals or substances resulting from animals or human activity.  Groundwater is normally very clean and is simply disinfected to help minimize the chance of any viral and bacterial contamination.
Each well is equipped with on-line apparatus for operation and monitoring purposes.  An alarm system is integrated in the monitoring process to notify operators if there is a problem at any well site or District facility.  Two District wells have additional filtration equipment designed to remove naturally occurring iron and manganese found in these two wells to aesthetically acceptable levels. One upper aquifer well has the nitrates removed prior to distribution into the water system. 

The Utilities Department operators are responsible for treatment of the six groundwater supply wells.  Crews are also responsible for water quality monitoring, sampling, distribution system repair/maintenance, meter reading and regulatory reporting compliance. The delivery of water to the District’s water customers is conveyed through a network of over 27 miles of water mainlines, utilizing three (3) water storage tanks connected through approximately 2,750 water service lines and meters serving residences and businesses. Included in the domestic water service infrastructure are 3 water storage tanks, 162 fire hydrants with some 558 valves that require periodic maintenance and inspection. These services provided by Utilities Department personnel not only assure delivery of clean, safe and potable drinking water, but also provide the water essential for fire fighting.

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