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DEFINITIONS AND ABBREVIATIONS
<: less than
Action level: the concentration of a contaminant that, if
exceeded, triggers treatment or other requirements that a
community water system shall follow
C/100 ml: colonies per 100 milliliters
Gr/gal: Grains Per Gallon: measure of water hardness
EPA: United States Environmental Protection Agency
MCL: Maximum Contaminant Level: The highest level of a
contaminant that is allowed in drinking water. MCL’s are set as
close to the MCLGs as
feasible using the best available treatment technology
MCLG: Maximum Contaminant Level Goal: The level of a
contaminant in drinking water below which there is no known or
expected risk to health. MCLG’s allow for a margin of safety.
µg/L: micrograms per liter: a unit of measurement equal
to ppb
mg/L: milligrams per liter: a unit of measurement equal
to ppm
MRDL: Maximum Residual Disinfectant Level goal: The level
of a drinking water disinfectant below which there is no known
or expected risk to health. MRDL GOALS do not reflect the benefits
of the use of disinfectants to control microbial contaminants.
NA: not applicable
ND: none detected
NR: not required
NTU: Nephelometric Turbidity Unit: measure of how light
is scattered by particulate matter in water
pCi/L: pico-Curies per Liter: a measure of radioactivity
ppb: parts per billion: a unit of measurement equal to
micrograms per liter (µg/L). 1 ppb (or 1 µg/L) is comparable to
one penny in $10,000,000.
ppm: parts per million: a unit of measurement equal to
milligrams per liter (mg/L). 1 ppm (or 1 mg/L) is comparable to
one penny in $10,000.
TT: Treatment Technique: a required process intended to
reduce the level of a contaminant in drinking water
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