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ENVIRONMENTAL HEALTH DEPARTMENT 1100 SAN JOAQUIN COUNTY 2 Donna K. Heran, R.E.H.S. Unit Supervisors Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. Al Olsen, R.E.H.S. Stockton.California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. • .. �'P • Program Manager Laurie A. Cotulla, R.E.H.S. Telephone: t'09)468-3420 Douglas W. Wilson, R.E.H.S. 4C/FOR \ Margaret Lagorio,R.E.H.S. Program Manager Fax: (209)464-0138 Robert McClellon, R.E.H.S. Website:«-«-«,.sjgov.org/ehd/ Jeff Carruesco, R.E.H.S. October 27, 2005 FILE COPY Anthony and Patricia Dutra, Trust 23480 S. Tinnin Road Manteca, CA 95337 RE: Nitrates in your Water Well for Minor Subdivision PA-0500507 At 23480 South Tinnin Road, Manteca As part of the Minor Subdivision Approval process, water test results were submitted by Don Chesney of Chesney Consulting in which a sample taken July 12, 2005, was tested for Nitrates and showed results of 129 ppm (parts per million) in your domestic well at the above referenced address. The State Department of Health Services adopted a standard of 45 parts per million (ppm) for nitrates in public drinking water systems; however, private well owners are not legally required to meet this standard. As a precaution for yourself,members and guests, the Environmental Health Department would suggest that you have your domestic well tested annually to verify if the above-described chemical continues to be above state drinking standards. If your private well analysis for nitrate exceeds the State standard of 45 ppm again, the following alternatives are being provided for your guidance: 1. As a temporary measure, it is recommended that bottled drinking water be used if this well is supplying drinking water. 2. In cases where exposure may continue indefinitely, such as with contaminated private wells, installation of a water treatment device, such as a filter, may be advisable. However, using bottled water or installing a water treatment device at the kitchen water tap, will not stop exposure to nitrates in your private water supply. Most treatment units sold for home installation only treat water at the point of use, such as the kitchen faucet, and do not prevent exposure through skin contact, bathing or inhalation. As a result, point of entry filters, which treat water for the entire house, are recommended because they remove all potential sources of exposure. The "Reverse Osmosis Purification Filter" is the recommended water treatment device in this case. It operates by passing the Well water through a series of filters and reverse osmosis membranes thereby removing the nitrate contaminant. Water treatment equipment suppliers and installers are listed in your phone directory yellow pages under "Water Filtration& Purification Equipment."