Total coliforms are a group of bacteria commonly found in the environment, including soil, water, and vegetation. They are also present in the intestines of warm-blooded animals and humans. The presence of total coliforms in water can indicate potential contamination by fecal matter, which may carry harmful pathogens. Testing for total coliforms is a standard method used to assess water quality, especially in drinking water supplies. While most total coliforms are not harmful, their presence can signal the need for further testing for more dangerous bacteria, such as E. coli, which can pose serious health risks.