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South Madison 2019 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 those listed under “Untreated Source Water”). 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
Inorganics              
Barium (ppm) 2 2 0.33 0.33 ND - 0.33 Yes Erosion of natural deposits
Fluoride (ppm) 4 4 0.62 0.75 0.41 - 0.75 Yes Natural deposits; water treatment additive
Nitrate (ppm) 10 10 0.52 0.78 0.41 - 0.78 Yes Fertilizer, septic tank leachate
Secondary Drinking Water Standards MCLG (Goal) SMCL   *Secondary standards are non-mandatory guidelines established by the EPA to assist utilities in managing drinking water for aesthetic considerations, such as taste, odor, and color. These contaminants are not considered to present a risk to human health at the SMCL
Chloride (ppm) N/A 250 26 28 23 - 28 N/A Natural deposits; water treatment additive
Hardness (ppm) N/A N/A 408 450 360 - 450 N/A Erosion of natural deposits; leaching
Iron (ppm) N/A 0.3 0.032 0.032 0.032 (1 sample) N/A Erosion of natural deposits; leaching
pH (Standard Units) N/A 6.5 - 8.5 7.75 7.98 7.27 - 7.98 N/A  
Silver (ppb) N/A 100 2.4 7.0 ND - 7.0 N/A Naturally present in the environment
Sodium (ppm) N/A N/A 9.4 11 8.2 - 11 N/A Erosion of natural deposits; leaching
Sulfate (ppm) N/A 250 48 50 43 - 50 N/A Erosion of natural deposits; leaching
Disinfectant Residual MRDLG MRDL          
Chlorine (as Cl2) (ppm) 4 4 1.8 2.2 1.1 - 2.2 Yes Water additive used to control microbes
Copper and Lead  MCLG AL          
Copper (ppm) [2018 Data] 1.3 1.3 0.27 1.5 0.17 ppm is the 90th Percentile
(1 of 8 > AL)
1.5 Corrosion of customer plumbing
Lead (ppb) [2018 Data] 0 15 2.5 9.7 8.5 ppb is the 90th Percentile
(0 of 8 > AL)
9.7 Corrosion of customer plumbing
Organic Disinfection By-products
Total Trihalomethanes (TTHMs) (ppb) N/A 80 8.5 9.5 7.4 - 9.5 Yes By-product of chlorination treatment
Haloacetic acids (HAA5) (ppb) N/A 60 4.7 5.0 4.4 - 5.0 Yes By-product of chlorination treatment
Microorganisms               
E coli 0 1 ND ND ND Yes Human and animal fecal waste
Total Coliforms N/A 5.0% N/A 1 Sample 0 - 1 Yes Naturally present in the environment
Radionuclides [2019 Data]    
Combined Radium -226 & -228 (pCi/L) 0 5 N/A 1.3 1 Sample Yes Erosion of natural deposits
Combined Uranium (ppb) 0 30 N/A 2.2 ug/L 1 Sample Yes Erosion of natural deposits
Gross Alpha excluding Radon and Uranium (pCi/L) 0 15 N/A 1.1 1 Sample 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 required no less frequently than every three years. Radiochemical contaminant monitoring is conducted every nine years.

Note about Lead in Tap Water: Infants and young children are typically more vulnerable to lead in drinking water than the general population. It is possible that the lead levels at your home may be higher than other homes in your community as a result of materials used in your home’s plumbing. If you are concerned about elevated lead levels in your home’s water, you may wish to have your water tested. Also, flush your tap water for 30 seconds to two minutes before using tap water. Additional information is available from the U.S. EPA Safe Drinking Water Hotline at 800-426-4791 or www.EPA.gov

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