Positive coliform bacteria test results can be listed two ways. A questionable result means possible, but uncertain, presence of bacteria. An unsatisfactory result means bacteria levels are too high. If you receive a positive result, submit another sample. Mistakes made during collection can cause a positive result.
Bacteria also tend to clump together in water and on surfaces.
Several tests will give a better estimation of the bacteria level throughout the water supply. Bacteriological report form used by the Indiana State Board of Health for a private water supply. A positive result indicates the water must be disinfected for cooking and drinking. Two common methods of disinfection are shock chlorination and continuous chlorination. After receiving a positive result, not caused by poor sampling, shock chlorinate your water supply.