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Important Definitions
Maximum Contamination Level Goal (MCLG):

The level of a contaminant in drinking water below which there is no known or expected risk to health. MCGL’s allow for a margin of safety.


Maximum Contaminant Level (MCL):

The highest level of contaminant that is allowed in drinking water.  MCL’s are set as close to MCLG’s as feasible using the best available treatment technology.


Maximum Residual Disinfection Level (MRDL): 

The highest level of disinfectant (Chlorine, Chloramines and Chlorine Dioxide) allowed in drinking water.  There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.


Maximum Residual Disinfectant Goal (MRDG): 

The level of a drinking water disinfectant (Chlorine, Chlora- mines, Chlorine Dioxide) below which there is no known or expected risk to health.  MRDLG’s do not reflect the benefits of the use of disinfectants to control microbial contaminants.


Treatment Technique:

A method by which water is treated in a water treatment facility.


Action level (AL): The concentration of a contaminant which, if exceeded, triggers treatment or other requirements that a water system must follow.