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CD�Nr` ENVIRONMENTAL HEALTH FACT 5HEET WQ� �- �4b s Instructions for Well Disinfection 00%—�� 1826 Please read care&lly before disinfecting! Necessary Items: ■ One cup of granular chlorine or 1 gallon of regular unscented liquid bleach -r$ ■ Clean hose(s) to extend from the home to the well E �' ■ Wrenches to remove the well cap ■ 5-gallon bucket ■ Small cup ■ Water sample bottle(s) ■ Location of ON/OFF switch for the well pump j ■ Eye and skin protection Procedure: 1) Draw off about 4 gallons of water into a 5-gallon bucket. Mix one (1) gallon of regular unscented liquid bleach with the 4 gallons of water. Note: Liquid bleach should not be used with a steel well casing; it can break loose accumulated corrosion and cause pump failure. Instead, use granular chlorine in a steel well casing. 2) Turn off the power to your well pump. Remove the well cap. Be careful if set screws or bolts on your well cap are rusty. Note: If the well cap has one large bolt in the center of the cap, you should not attempt to remove it. Have a licensed well contractor disinfect your well. In addition, if your well head or top is buried, or if you have a shallow well installation, your well does not meet current well construction code requirements. Chlorinating these wells is difficult and in many cases impossible. If you have an unsafe water sample and you have a well that fits this description, contact a Washtenaw County Sanitarian at (734) 222-3800. 3) Pour the chlorine/bleach mixture into the well between the casing and the cross bar or"T" bar. DO NOT pour the mixture into the 1" center hole. (Newer wells will often have markings or a statement next to the correct hole, indicating where to pour the chlorinating solution.) Avoid contact of the solution with the wire connections inside the well, as they could corrode. 4) Connect a clean hose to an outside spigot and extend it into the well approximately 4 feet. 5) Turn the power supply back on to the well pump. Turn on the outside spigot that is connected to the hose in the well. Allow the hose to run in the well for approximately 20 minutes. This distributes the disinfectant throughout the well system. Turn the spigot off when done. 6) Turn off the power supply to the well pump. Once the power is off, remove the hose from the well, and put the well cap back onto the well using the existing nuts and bolts. 7) Turn on the power to the well pump. All work is now completed on the wellhead. 8) Now it's time to distribute the chlorine/bleach to the pipes. Turn on each indoor and outdoor water faucet, and allow cold water to run until a chlorine/bleach odor is detected. Don't forget to run the shower, clothes washer, dishwasher, and any outside hydrants or plumbing fixtures in other buildings. Also, flush each toilet a couple of times. Once you detect a bleach odor, turn off all faucets. Note: Some water softening units should not be chlorinated. Contact your water softening company prior to disinfection to determine if you should bypass the softening system.