| Non-Detectable (ND) - indicates that the
constituent is not present or that the value is too small to be detected. |
|
| Parts per million (ppm) - one part per
million corresponds to one minute in two years, or a single penny in
$10,000. |
|
| Parts per billion (ppb) - one part per
billion corresponds to one minute in 2,000 years, or a single penny in
$10,000,000. |
|
| Parts per trillion (ppt) - one part per
trillion corresponds to one minute in 2,000,000 years, or a single penny
in $10,000,000,000. |
|
| Picocuries per liter (pCi/L) -
picocuries per liter is a measure of the radioactivity in water |
|
| Nephelometric Turbidity unit (NTU) -
nephelometric turbidity unit is a measure of the clarity of water.
Turbidity in excess of 5 NTU is just noticeable to the average person. |
|
| Action Level - the concentration of a
contaminant which, if exceeded, triggers treatment or other requirements
which a water system must follow. |
|
| Treatment Technique (TT) - A treatment
technique is a required process intended to reduce the level of a
contaminant in drinking water. |
|
| Maximum Contaminant Level Goal - the
"Goal" (MCLG) is 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 - the
"Maximum Allowed" (MCL) is 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. |
|
| MCLs are set at very stringent levels. A person would have
to drink two liters of water every day at the MCL level for a lifetime to
have a one-in-a-million chance of having any possible health effects. |
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