Total Coliforms
Total coliforms are a group of bacteria found in the environment, including in soil, vegetation, and feces of warm-blooded animals. They are used as an indicator of water quality and the potential presence of harmful pathogens.
EPA MCLG
0 %
EPA's health goal is zero — no known safe level of exposure. This is a goal, not an enforceable limit.
Health Effects
While most coliform bacteria are not harmful, the presence of total coliforms in drinking water indicates that the water may be contaminated with fecal material and pathogens that can cause disease. Exposure can lead to gastrointestinal illnesses, respiratory infections, and other health issues.
Affected Organs & Systems:
Source: EPA — Revised Total Coliform Rule (retrieved 2026-07-27)
Common Sources
- Agricultural runoff
- Sewage discharge
- Natural deposits
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About the EPA MCLG
The EPA MCLG is the level of a contaminant in drinking water below which there is no known or expected risk to health. It is a non-enforceable public health goal, and is often stricter than the legal limit (MCL) water systems must meet.
Contaminant Type
Total Coliforms is classified as a Bacteria contaminant.
This contaminant primarily affects the Gastrointestinal system, Nervous system.
Related Bacteria Contaminants
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