Coliforms are bacteria that are naturally present in the environment and are used as an indicator that other, potentially-harmful, bacteria may be present.
WELLS: Levels of coliform over four (4) colonies can indicate poor well construction or cleaning, or issues related to aging of the well such as the presence of holes in in the well casing. Samples indicating the presence of coliform bacteria must be tested for E. coli.
See E. coli, fecal coliform, and fecal indicators.
Total Coliform Bacteria (Counts)
MCL ADVISORY - ACTION IS REQUIRED
Total coliform levels were detected in your water sample to exceed the maximum contaminant level (MCL) of 4 MPN or CFU as required for Private Water Systems without Continuous Disinfection.
ACTION IS OPTIONAL
Your well water meets compliance with the private water systems rules standard of <=4 MPN or CFU.
- Ohio Department of Health - Private Water Systems Program - Water Quality - Total Coliform
- USEPA - Water: Basic Information about Regulated Drinking Water Contaminants - Basic Information about Pathogens and Indicators in Drinking Water
- USEPA - Water: Monitoring & Assessment - Fecal Bacteria
- CDC - Drinking Water - Well Testing