Tap WaterIndex

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Tap water quality report

Madison

EPA monitoring tested this supplier for 37 contaminants and detected 7. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

37
contaminants tested
7
detected
6,191
people served
36
health-based violations
South Dakota rankingsLead in South DakotaPFAS in South Dakota
Water source
Ground water
Ownership
Local government
Counties served
Lake

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

36
health-based violations
86
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2013-01-01 → 2013-03-31
MCL Health-based Resolved 2013-01-01 → 2013-03-31
MCL Health-based Resolved 2013-01-01 → 2013-03-31
MCL Health-based Resolved 2013-01-01 → 2013-03-31
MCL Health-based Resolved 2012-10-01 → 2012-12-31
MCL Health-based Resolved 2012-10-01 → 2012-12-31
MCL Health-based Resolved 2012-10-01 → 2012-12-31
MCL Health-based Resolved 2012-10-01 → 2012-12-31
MCL Health-based Resolved 2012-07-01 → 2012-09-30
MCL Health-based Resolved 2012-07-01 → 2012-09-30

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Copper
550 µg/L 42%
of the EPA limit 1300 µg/L
 100/100 SYR4 2014–2018
Lead
45.5 µg/L 303%
of the EPA limit, in the worst sample — 15 µg/L
 100/100 SYR4 2014–2018
TTHM
117 µg/L 146%
of the EPA limit, in the worst sample — 80 µg/L
 22/22 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
22.6 µg/L 38%
of the EPA limit 60 µg/L
 21/21 SYR4 2012–2019
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2023
Lithium
87 µg/L
No EPA limit set
 4/4 UCMR-5 2024
Nitrate
600 µg/L 6%
of the EPA limit 10000 µg/L
 2/6 SYR4 2017–2019
30 contaminants tested, none detected
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Utility contact

Contact
JAN TIEMAN
Phone
6052567515
Email
Jan.tieman@cityofmadisonsd.gov

Frequently asked questions about Madison

Is Madison tap water safe to drink?

EPA monitoring detected 7 contaminants in Madison's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Madison's water?

EPA monitoring detected Copper, Lead, TTHM, Total Haloacetic Acids (HAA5), Lead, and others. The full list with the level and data source for each is above.

How many people does Madison serve?

Madison reports serving 6,191 people in South Dakota, per its EPA record.

Has Madison had any water quality violations?

The EPA has 86 violations on file for Madison, of which 36 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.