To chlorinate a well, pour 1 gallon of bleach into the well for each 500 drilled feet, or pour 1 gallon of bleach into the well for each 18 feet of standing water if the well is shallow. Run the outdoor faucet until a bleach smell is detected, and run water through all indoor appliances and attachments until the old water is replaced with chlorinated water. After 24 hours, turn the water on to help remove the chlorine.
Use non-scented household bleach to chlorine the well. Do not use the water for drinking, cooking, washing clothes or bathing after adding the chlorine. If possible, pour the bleach along the sides of the well when adding it to the water.
Allow the hot water to run for 10 to 15 minutes to replace the water in the tank with chlorinated water. After 24 hours, turn the outdoor faucet on for one hour, using a garden hose to direct the water to an appropriate drainage area.
After one hour, turn the water off for two hours, and repeat the process until the chlorine is gone. To determine chlorine levels, use a chlorine test strip. Repeat the process of turning on all appliances and faucets in the home to replace the chlorinated water with fresh water.