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Definitions & Charts Legend
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Definitions & Charts Legend
Action Level (AL)
The concentration of a contaminant, which if exceeded, triggers treatment or other requirements which a water system shall follow.
Maximum Contaminant Level Goal (MCLG)
The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety.
Maximum Contaminant Level (MCL)
The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
Maximum Residual Disinfectant Level (MRDL)
The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.
Maximum Residual Disinfectant Level Goal (MRDLG)
The level of drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants.
Treatment Technique (TT)
A required process intended to reduce the level of a contaminant in drinking water.
mg/L milligrams per liter, or parts per million
mg/L micrograms per liter, or parts per billion NTU Nephelometric Turbidity Units N/A Not applicable |
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