Shock chlorination involves placing a strong chlorine solution in the well and the complete distribution system to kill nuisance and disease-causing organisms. After shock chlorination, submit another water sample for testing. The water should test negative before use. More than one shock chlorination treatment may be needed to effectively treat the entire water supply. If the source of bacterial contamination cannot be identified or eliminated, continuous disinfection of the water supply may be necessary.
Chlorination is the most common disinfection method.
Summary Bacterial contamination of drinking water can be a problem. A water test is the only way to evaluate whether bacteria is present in a water supply. Proper well location and construction are keys to avoiding bacterial contamination of drinking water. If contamination is present, attempt to identify and eliminate the source of the contamination. A contaminated water supply can be disinfected.