What does a testing report showing “non-fecal coliforms” mean?

A testing report showing "non-fecal coliforms" indicates the presence of bacteria that are generally non-pathogenic. Non-fecal coliforms are typically found in soil and vegetation and are not usually associated with fecal contamination or waterborne pathogens. Their presence often suggests that the water source may have been exposed to environmental contamination but does not necessarily pose a health risk to humans.

In water quality testing, the detection of non-fecal coliforms can help differentiate between the sources of bacterial contamination. For example, while fecal coliforms indicate potential pollution from animal or human waste, the presence of non-fecal coliforms typically signals a lower risk level regarding health hazards. Therefore, when interpreting water quality reports, understanding the distinction between these types of bacteria is crucial for assessing the potential health risks associated with water use.

This understanding is integral for environmental health specialists as they evaluate the safety of water supplies and implement necessary measures to ensure public health.