2020 Water Quality Data Table (continued)
90th Percentile AND Number of Samples Over the Action Level
Number of Samples Exceedes AL
Sample Month & Year
Violation Yes/No
Lead & Copper
Location(s)
AL ALG
Likely Source of Contaminant
Lead c (ppb)
N <0.00200
0 c
15 0
Aug-20 Corrosion of household plumbing systems; Erosion of natural deposits
10 Representative Sample Sites
Copper d (ppm)
N 0.149
0 d
1.3 1.3
Aug-20 Corrosion of household plumbing systems; Erosion of natural deposits
Table Footnotes
a
If the results for Alpha emitters is above 5 pCi/L, an additional test for radium would be required.
b
If the results for Alpha emitters is above 15 pCi/L, an additional test for uranium would be required.
c 90% of the samples taken had a detected amount of <0.00200. None of the samples taken exceeded the action level. d 90% of the samples taken had a detected amount of 0.149 or less. None of the samples taken exceeded the action level. ** Well 3 sample result for sodium was 1,300 ppm from MAP sampling, a follow-up test results were 5.2 ppm
Definitions
MCL Maximum Contaminant Level - The “Maximum Allowed” (MCL) is 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. MCLG Maximum Contaminant Level Goal - The “Goal” (MCLG) is the level of a contaminant in drinking water below which MCLGs allow for a margin of safety. There is no known or expected risk to health. MRDL Maximum Residual Disinfection Level - 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. MRDLG Maximum Residual Disinfection Level Goal - 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. MRL Minimun Reporting Limit - The smallest measured concentrationof a substance that can be reliably measured by a given analytical method. MREM Millirems Per Year - A measure of radiation absorbed by the body
AL Action Level -The concentration of a contaminant, which, if exceeded, triggers treatment or other requirements, which a water system must follow.
TT Treatment Technique - A treatment technique is a required process intended to reduce the level of a contaminant in drinking water. ppb Parts Per Billion or Micrograms per Liter (ug/L) ppm Parts per million or Milligrams per Liter (mg/L) pCi/1 Picocuries per liter - a measure of the radioactivity in water P/A Presence/Absence ND or < No Detect - Not detectable az reporting limit N/A Not Applicable - Sampling was not completed by regulation or was not required µg/L Micrograms per liter (1 = 1000 mg/L)
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