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The coliform index is a rating of the purity of water based on a count of fecal bacteria. It is one of many tests done to assure sufficient water quality. Coliform bacteria are microorganisms that primarily originate in the intestines of warm-blooded animals.

ing to the World Health Organization, a zero count of E. coli per 100 ml of water is considered safe for drinking. A count of 1–10 MPN/100 ml is regarded as low risk; 11–100 MPN/100 ml is medium risk.

Contaminant Level coli in drinking water. For E. coli (EC), the Maximum Contaminant Level Goal (MCLG) is set at zero. The Maximum Contaminant Level (MCL) is based on the occurrence of a condition that includes routine and repeat samples.

If any routine sample is total coliform-positive, repeat samples are required. samples must be collected and analyzed for total coliforms: One REPEAT sample must be collected from the same tap as the original sample. One REPEAT sample must be collected within five service connections upstream.

The Maximum Contaminant Level (MCL) for bacteria in drinking water is zero total coliform colonies per 100 milliliters of water as established by the EPA. The total coliform test is the basic yardstick for determining the biological quality in a water supply.

The term CFU refers to the number of living bacterial cells in a water sample. Therefore, this measure is used to tell us the degree of contamination in samples of water or the degree of the infection in humans and animals. For full- body contact, E. coli levels cannot exceed 235 CFU per 100 mL of water.

The Maximum Contaminant Level (MCL) for bacteria in drinking water is zero total coliform colonies per 100 milliliters of water as established by the EPA.

The Environmental Protection Agency (EPA) establishes health standards for contaminants in drinking water. The heath standard (Maximum Contaminant Level, or MCL) for total coliform in drinking water established by the EPA is zero.