What are bacteria in water, and how can they be removed?

Water tests often look for total coliform bacteria as an indicator that a well or water system may be vulnerable to contamination. A positive result may require additional testing for organisms such as E. coli, along with an inspection of the well and plumbing.

Treatment may involve well disinfection, correcting the source of contamination, and installing ultraviolet or chlorination equipment for ongoing protection. If harmful bacteria are detected, follow the instructions of the local health department before drinking the water.