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90th Percentile Value
This means that 90 percent of the samples collected were equal to or below the value reported.
Action Level (AL)
The concentration of a contaminant which, if exceeded, triggers treatment.
Highest Locational Running Annual Average (LRAA)
The highest calculated average of multiple results at a single location in a 12-month period.
Maximum Contaminant Level (MCL)
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.
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.
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n/a
Non-Applicable
ND
Contaminant not detectable using current monitoring equipment and methods.
Nephelometric Turbidity Units (NTU)
A measure of water clarity.
Parts Per Billion (ppb)
One part per billion corresponds to one penny in $10,000,000 or approximately one minute in 2,000 years.
Parts Per Million (ppm)
One part per million corresponds to one penny in $10,000 or approximately one minute in two years.
Treatment Technique (TT)
A required process intended to reduce the level of a contaminant in drinking water.
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