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FOR HOLDING TANK: To Shock: 3 cups Bleach per 1000 Gal. Maintain: 1 cup Bleach per 1000 Gal. Alpha YAnalytical Laboratories Inc. 208 Mason St. Ukiah, California 95482 e-mail: clientservices@alphadabs corn • Phone: (707) 468-0401 • Fax: (707) 468-5267 Well Disinfection for Bacterial Contamination If water from a well is found to be contaminated with coliform bacteria, it may be possible to eliminate the contamination by disinfecting the well. If the well is improperly constructed or poorly located, contamination may not be eliminated or may be only temporarily eliminated. In that case, a permanent disinfection system or a new well may be necessary. Well water systems may be disinfected by adding chlorine bleach to the water in the well. Clorox, Purex, White Magic, and Sani-Clor are some of the trade names for liquid bleaches sold in grocery stores. Read the label to insure it says the bleach contains 5.25 percent sodium hypochlorite. Use the following dosages as a guide: Well Casing Diameter Amount of Chlorine Bleach Needed 4 inches Two and one-half (2 1/2) cups 6 inches Five (5) cups 8 inches Seven and one half (7 1/2) cups 12 inches Twenty (20) cups or 1 1/4 gallons NOTE: These quantities are for 100 feet of well depth. Adjust the quantities to fit the depth of your well. Use only unscented bleach. These are the steps you should follow: If the water is cloudy, attempt to clear as much as possible by pumping the well to waste. With the pump NOT operating, add the chlorine. It may be necessary to lift the pump, but some wells have openings that can be used for this purpose. The bleach should be added between the casing and the suction pipe of the pump. Do not operate the pump for 30 minutes. After the 30-minute period, with the taps, faucets and hydrants open or closed, surge the well by starting and stopping the pump several times. Open every tap, faucet or hydrant in the water piping system. Start the pump and let water flow until clean water with a strong smell of chlorine comes out. Stop the pump and close all taps, faucets and hydrants and allow the mixture to stand in the system for 24 hours, or at least overnight. Disinfectant contact time with bacteria is important. After contact time is accomplished, flush the chlorine mixture from the system by hooking a garden hose to an outside tap and running until no chlorine odor is present. Do not flush the mixture into your septic system by running chlorinated water down drains!! Your septic system was not designed to handle the large continuous flow of water necessary to remove the chlorine and chlorine is harmful to the beneficial bacteria that make your septic tank function properly. Since chlorine will kill grass and plants, be careful where you run the water outside. Do not run mixture into streams, rivers, etc. When you can no longer smell chlorine in the water, close all taps and faucets and use the system normally. After at least one week, you should have your water retested for the presence of bacteria.