- Maximum Contaminant Level (MCL) : A Maximum Contaminant Level (MCL) is the highest level of a Contaminant that is allowed in drinking water. MCLs are set as close to the MCLG as feasible using the best available treatment technology and taking cost into consideration. MCLs are enforceable standards.
Other /More definition:
A Maximum Contaminant Level (MCL) is the highest level of a Contaminant that EPA allows in drinking water. MCLs ensure that drinking water does not pose either a short-term or long-term health risk. EPA sets MCLs at levels that are economically and technologically feasible. Some states set MCLs which are more strict than EPA's.
Other /More definition:
A Maximum Contaminant Level (MCL) is the highest level of a Contaminant that EPA allows in drinking water. MCLs ensure that drinking water does not pose either a short-term or long-term health risk. EPA sets MCLs at levels that are economically and technologically feasible. Some states set MCLs which are more strict than EPA's.

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