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o <br /> SANJOAQUIN Environmental Health Department <br /> Jasjit Kang, REHS, Director <br /> COUNTY Muniappa Naidu,REHS,Assistant Director <br /> cgtlP Greatness grows here. PROGRAM COORDINATORS <br /> - Jeff Carruesco, REHS, RDI <br /> Willy Ng, REHS <br /> Steven Shih, REHS <br /> Elena Manzo, REHS <br /> Natalia Subbotnikova, REHS <br /> November 19, 2025 <br /> JAMES & SERINA LEE <br /> 9024 S. PRIEST ROAD, <br /> FRENCH CAMP, CA 95231 <br /> RE: Nitrates in your Water Well for 9128 S. Priest Road, French Camp <br /> The Environmental Health Department (EHD) has received water test results taken by Advanced <br /> GeoEnvironmental. The sample taken on August 13, 2025, was tested for nitrates showed results <br /> of 93 mg/L (milligrams per liter) Nitrate as Nitrogen in your domestic well at for 9128 S. Priest <br /> Road, French Camp. <br /> The State Water Resources Control Board adopted a Maximum Contamination Level (MCL) of <br /> 10 mg/L for Nitrate as Nitrogen (N) in public drinking water systems; however, private well owners <br /> are not legally required to meet this standard. As a precaution for yourself, members and guests, <br /> the EHD would suggest that you have your domestic well tested annually to verify if the above- <br /> described chemical continues to be above state drinking standards. <br /> If your private well analysis for nitrate exceeds the State standard of 10 mg/L 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 <br /> is supplying drinking water. Infants below the age of six months who drink water <br /> containing nitrate in excess of the MCL may quickly become seriously ill and, if untreated, <br /> may die because high nitrate levels can interfere with the capacity of the infant's blood to <br /> carry oxygen. Symptoms include shortness of breath and blueness of the skin. High <br /> nitrate levels may also affect the oxygen-carrying ability of the blood of pregnant women. <br /> 2. In cases where exposure may continue indefinitely, such as with contaminated private <br /> wells, installation of a water treatment device, such as a filter, may be advisable. However, <br /> using bottled water or installing a water treatment device at the kitchen water tap will not <br /> stop 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 <br /> prevent exposure through skin contact, bathing or inhalation. As a result, point of entry <br /> filters, which treat water for the entire house, are recommended because they remove all <br /> potential sources of exposure. The "Reverse Osmosis Purification Filter" is the <br /> recommended water treatment device in this case. It operates by passing the well water <br /> through a series of filters and reverse osmosis membranes thereby removing the nitrate <br /> contaminant. Water treatment equipment suppliers and installers are listed in your phone <br /> directory yellow pages under"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, to determine water quality prior to final placement <br /> 1868 E. Hazelton Avenue I Stockton, California 95205 1 T 209 468-3420 1 F 209 464-0138 1 www.sjgov.org/ehd <br />