A Guide to Your Water Quality This report is a summary of the quality of water we provided to our customers in 2019. Data found in the following pages was obtained from sampling protocols, as defined by the Environmental Protection Agency (EPA).
Definitions and Abbreviations Action Level: The concentration of a contaminant, which, if exceeded, triggers treatment or other requirements that a water system must follow. Level 1 Assessment: A Level 1 assessment is a study of the water system to identify potential problems and determine (if possible) why total coliform bacteria were found.
There is evidence that addition of a disinfectant is necessary for control of microbial contaminants. MRDLG: Maximum Residual Disinfectant Level Goal; the level of a drinking water disinfectant below which there are no known or expected health risks. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants.
Level 2 Assessment: A Level 2 assessment is a very detailed study of the water system to identify potential problems and determine (if possible) why an Escherichia coli (E. coli) maximum contaminant level (MCL) violation has occurred and/or why total coliform bacteria were found on multiple occasions.
MRL: Minimum Reporting Level; the lowest concentration of a constituent or a contaminant that can be measured by a laboratory.
MCL: Maximum Contaminant Level; the highest level of a contaminant allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
NTU: Nepholomeric Turbidity Units; a measure of water turbidity or clarity.
MCLG: Maximum Contaminant Level Goal; the level of a contaminant in drinking water below which there is no known or expected health risks. MCLGs allow for a margin of safety. MRDL: Maximum Residual Disinfectant Level; the highest level of disinfectant allowed in drinking water.
WATER QUALITY REPORT 2020 | CITY OF SOUTHLAKE
Water Quality Report 2020.indd 3
N/A: Data field not applicable to the particular constituent we are reporting information about.
pCi/L: Picocuries per Liter; a measure of radioactivity. ppb: Parts per Billion or micrograms per liter (Âľg/L). ppm: Parts per Million or milligrams per liter (mg/L). TT: Treatment Technique; a required process intended to reduce the level of a contaminant in drinking water.
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