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San Joaquin County DIRECTOR <br /> Po u i N Donna Heran, REHS <br /> ..X, Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> 11aL1.-. :• Carl Borgman,REHS <br /> . ..P Mike Huggins,REHS,RDI <br /> FORS\ Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> March 3, 2008 Phone: (209)468-3420 Robert McClellon,REHS <br /> Fax: (209) 464-0138 Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> Mary Slikker FILE COPY <br /> 14222 E. Louise Avenue <br /> Ripon,California 95366 <br /> RE: Nitrates in your Water Well for Minor Subdivision PA-07-00214 (MS) <br /> As part of the Minor Subdivision process,water test results were submitted by Wong Engineers <br /> in which samples taken December 27, 2007 was tested for nitrates and showed results of 51.4 <br /> parts per million(ppm) in your domestic well at 14222 E. Louise Avenue, Ripon. <br /> The State Department of Health Services adopted a standard of 45 parts per million(ppm) for <br /> nitrates in public drinking water systems; however,private well owners are not legally required <br /> to meet this standard. As a precaution for yourself,members and guests, the Environmental <br /> Health Department would suggest that you have your domestic well tested annually to verify if <br /> the above-described chemical continues to be above state drinking standards. <br /> If your private well analysis for nitrate exceeds the State standard of 45 ppm again,the following <br /> alternatives are being provided for your guidance: <br /> 1. As a temporary measure, it is recommended that bottled drinking water be used if this well is <br /> supplying drinking water. <br /> 2. In cases where exposure may continue indefinitely, such as with contaminated private wells, <br /> installation of a water treatment device, such as a filter,may be advisable. However,using <br /> bottled water or installing a water treatment device at the kitchen water tap,will not stop <br /> exposure to nitrates in your private water supply. Most treatment units sold for home <br /> installation only treat water at the point of use, such as the kitchen faucet, and do not prevent <br /> exposure through skin contact, bathing or inhalation. As a result, point of entry filters,which <br /> treat water for the entire house, are recommended because they remove all potential sources <br /> of exposure. The "Reverse Osmosis Purification Filter"is the recommended water treatment <br /> device in this case. It operates by passing the well water through a series of filters and <br /> reverse osmosis membranes thereby removing the nitrate contaminant. Water treatment <br /> equipment suppliers and installers are listed in your phone directory yellow pages under <br /> "Water Filtration&Purification Equipment-" <br /> 3. A replacement well is also an alternative for providing uncontaminated water. It is <br /> recommended that a test well be drilled, in order to determine water quality prior to final <br /> placement of the well. Water quality may be determined and monitored through water sample <br />