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Water: Total Coliform Rule

Total Coliform Rule (TCR)

The Total Coliform Rule (TCR), which was published in 1989, set both health goals (Maximum Contaminant Level Goals) and legal limits (Maximum Contaminant Levels) for the presence of total coliforms in drinking water. The rule also details the type and frequency of testing that water systems must undertake. The rule applies to all public water systems.

EPA revised the 1989 TCR on February 13, 2013 intended to improve public health protection and the implementation of the rule by States and public water systems. Public water systems (PWSs) and primacy agencies must comply with the requirements of the Revised Total Coliform Rule (RTCR) by April 1, 2016.  Until then, PWSs and primacy agencies must continue complying with the 1989 TCR.

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