Understanding the Terms USED IN THE WATER QUALITY TABLE
STATE AND FEDERAL REGULATIONS – LEVELS OF CONTAMINANTS
This report shows the results of our monitoring for the period of January 1 to December 31, 2024. Federal and state regulations allow us to monitor for some contaminants less than once per year because the concentrations of these contaminants do not change frequently. Some of our data, though representative, may be more than one year old. The Environmental Protection Agency (EPA) requires monitoring of over 80 drinking water contaminants. Those contaminants listed in the tables are the only contaminants detected in your drinking water.
TO HELP YOU BETTER UNDERSTAND THE TERMS AND ABBREVIATIONS, WE'VE PROVIDED THE FOLLOWING DEFINITIONS:
Maximum Contaminant Level or MCL: 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. Maximum Contaminant Level Goal or 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 goal or MRDLG: The level of a drinking water disinfectant 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.
concentrations of trihalomethanes (THMs) and haloacetic acids (HAAs). Water systems will use results from the IDSE, in conjunction with their Stage 1 DBPR compliance monitoring data, to select compliance monitoring locations for the Stage 2 DBPR. Parts per million (ppm) or Milligrams per liter (mg/L): One part by weight of analyte to 1 million parts by weight of the water sample.
MGD: Million gallons per day.
Contaminant: Any physical, chemical, biological or radiological substance in the water.
Action Level (AL): The concentration of a contaminant that, if exceeded, triggers treatment or other requirements that a water system must follow.
Parts per billion (ppb) or Micrograms per liter (μg/L): One part by weight of analyte to 1 billion parts by weight of the water sample.
Violation: Violations occur when detected limits are greater than Maximum Contaminant Levels or Action Levels set by the EPA.
ND means not detected and indicates that the substance was not found by laboratory analysis.
Picocurie per liter (pCi/L): Measure of the radioactivity in water.
UCMR: Unregulated contaminants monitoring rule.
Initial Distribution System Evaluation (IDSE): An important part of the Stage 2 Disinfection Byproducts Rule (DBPR). The IDSE is a one-time study conducted by water systems to identify distribution system locations with high
Maximum residual disinfectant level or 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.
90th Percentile: The analytical result that is greater than or equal to 90% of the results.
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