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Terms & abbreviations
- Action Level (AL)
-
the concentration of a contaminant which, if exceeded, triggers treatment or
other requirements which a water system must follow
- Chlorine Residual
-
the amount of chlorine in water available for disinfection
- Disinfection By-product (DBP)
-
Chemical compounds that result from the addition of chlorine to water
containing organic substances
- HAA (haloacetic acids)
-
the combined concentration of the following five contaminants: dibromo-
dichloro-, monobromo-, monochloro-, and trichloro- acetic acids
- Inorganic Contaminant
-
chemical substances of mineral origin, such as iron or manganese
- 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 possible.
- 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 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 a disinfectant in drinking water 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.
- mg/L
-
(milligrams per liter) corresponds to one part of liquid in one million parts of liquid (parts per million - ppm)
- Microbiological contaminant
-
Very small organisms, such as bacteria
- NA
-
not applicable
- ND
-
not detected at testing limits
- NTU
-
Nephelometric Turbidity Unit - a measurement of particles in water
- Organics
-
substances containing the element carbon. These can be naturally occurring or
man-made and can include pesticides, solvents, and by-products of disinfection.
- pCi/L
-
picocuries per liter; units of concentration of radioactive substances
- ppb
-
parts per billion; a concentration equal to 1 microgram of a substance in one
liter of water, µg/L
- ppm
-
parts per million, a concentration equal to 1 milligram of a substance in one
liter of water, mg/L
- Radionuclides
-
Contaminants giving off ionizing radiation
- TTHM (total trihalomethanes)
-
the combined concentration of the following four contaminants:
bromodichloromethane, bromoform, chloroform, and dibromochloromethane
- TON (threshold odor number)
-
The greatest number of dilutions of a sample with "odor-free" water yielding a
definitely perceptible odor
- Treatment Technique (TT)
-
A required process intended to reduce the level of a contaminant in drinking water
- W (waiver)
-
variances and exemptions—state permission not to meet an MCL, treatment
technique, or monitoring requirement under certain conditions
- µg/L
-
(micrograms per liter) corresponds to one part of liquid in one billion parts
of liquid (parts per billion, ppb)
More information:  or 315-455-7061
After hours & weekend emergency answering service 315-475-7601
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