How to read the data? The tables show the results of the city’s water-quality analyses. The column marked “Level Detected” shows the highest results from the last time tests were performed. “Likely Source” shows where this substance usually originates.
The following descriptions explain other important details. Citizens may find unfamiliar terms and abbreviations in the data on the following pages.
To provide more understanding of the unfamiliar terms and abbreviations, please refer to the following:
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 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. Action Level (AL) The concentration of a contaminant that, if exceeded, triggers treatment or other requirements that a water system must follow.
Locational Running Annual Average (LRAA) The average of sample analytical results for samples taken at a particular monitoring location during the previous four calendar quarters. 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 feasible using the best available treatment technology. 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.
“N/A” Means not applicable.
“ND” Means not detected and indicates that the substance was not found by laboratory analysis. 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. 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. Treatment Technique (TT) A required process intended to reduce the level of a contaminant in drinking water.
Picocurie per liter (pCi/L) Measure of the radioactivity in water.
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