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South Madison Water Quality Data

The chart below gives you a quick look at some of the substances that the EPA requires the utility to test for. You’ll notice that the contaminant is listed to the left, followed by the maximum amount allowed by regulations and then the amount that we found in our water. The tests are done on treated or “finished” water (excluding the last three listed in this chart). See Definitions of Terms for an explaination of this chart.

Contaminant MCLG (Goal) MCL (Limit) Average of All Samples Maximum of All Samples System Wide Range Compliance Achieved Possible Source
Disinfectant Residual MRDLG MRDL          
Chlorine (as Cl2) 4 ppm 4 ppm 1.6 1.9 0.96 - 1.9 Yes Water additive used to control microbes.
Copper and Lead  MCLG AL          
Copper (ppm) [2015 Data] 1.3 ppm 1.3 ppm     0.13 (0 of 12 > AL) 90th Percentile Yes Corrosion of customer plumbing
Lead (ppb) [2015 Data] 0 ppb 15 ppb     1.2 (0 of 12 > AL) 90th Percentile Yes Corrosion of customer plumbing
Organic Disinfection By-products
Total Trihalomethanes (TTHMs) N/A 80 ppb     7.4 (Highest Sample) Yes By-product of chlorination treatment
Haloacetic acids (HAA5) N/A 60 ppb     8.5 (Highest Sample) Yes By-product of chlorination treatment
Microorganisms               
E coli 0 1     0 Yes Human and animal fecal waste
Total Coliforms   5.0%     0 Yes Naturally present in the environment
Radionuclides [2009 Data]    
Combined Radium-226/228 (pCi/L) 0 5     2.1 Yes Erosion of natural deposits
Combined Uranium 0 30     0.05 Yes Erosion of natural deposits
Gross alpha excluding radon and uranium 0 15     2.3 Yes Erosion of natural deposits

Note: The state requires us to monitor for certain contaminants less than once per year because the concentrations of these contaminants do not change frequently.  Some of our data, though accurate, is more than one year old. Some contaminants are sampled less frequently than once a year; as a result, not all contaminants were sampled for during the CCR calendar year. If any of these contaminants were detected the last time they were sampled for, they are included in the table along with the date that the detection occurred. Compliance monitoring for lead and copper is conducted every 3 years. Radiochemical contaminant monitoring is conducted every 9 years.

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