| Action Level |
The concentration of a contaminant which, if exceeded, triggers a treatment or other requirement that a water system must follow. |
CU
|
Color Unit |
| MFL |
Million fibers per liter |
| MCL |
Maximum Contaminant Level. The highest level of a contaminant that is allowed in drinking water. |
| MCLG |
Maximum Contaminant Level Goal. The contaminant level desired. |
| MREM |
Millirems (a measure of the radiation absorbed by the body) |
NTU
|
Nephelometric Turbidity Unit. Unit used in water treatment for measurement of cloudiness
|
pCi/L
|
Picocuries per liter (a measure of radioactivity)
|
| ppb |
Parts per billion. One part per billion is the equivalent of 1/2 of a dissolved aspirin tablet in 1,000 bathtubs of water (approximately 50,000 gallons). |
| ppm |
Parts per million. One part per million is the equivalent of 1/2 of a dissolved aspirin tablet in a full bathtub of water (approximately 50 gallons). |
TON
|
Threshold Odor Number. Unit of measure used to describe that level at which an odor is detected. The higher the number, the more noticeable the odor. |
| Treatment Technique |
A required process intended to reduce the level of a contaminant in drinking water |
