Tap WaterIndex

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Tap water quality report

Hill City

EPA monitoring tested this supplier for 20 contaminants and detected 9. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

20
contaminants tested
9
detected
872
people served
12
health-based violations
South Dakota rankingsLead in South DakotaPFAS in South Dakota
Water source
Ground water
Ownership
Local government
Counties served
Pennington

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.

12
health-based violations
244
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2018-10-01 → 2018-12-31
MCL Health-based Resolved 2018-10-01 → 2018-12-31
MCL Health-based Resolved 2018-10-01 → 2018-12-31
MCL Health-based Resolved 2018-07-01 → 2018-09-30
MCL Health-based Resolved 2018-07-01 → 2018-09-30
MCL Health-based Resolved 2018-07-01 → 2018-09-30
MCL Health-based Resolved 1991-05-01 → 1991-05-31
MCL Health-based Resolved 1991-05-01 → 1991-05-31
MCL Health-based Resolved 1991-05-01 → 1991-05-31
MCL Health-based Resolved 1991-05-01 → 1991-05-31

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 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Copper
991.6 µg/L 76%
of the EPA limit 1300 µg/L
worst single sample: 1130 µg/L
40/40 SYR4 2012–2017
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
 24/24 LCR 2025
Lead
2 µg/L 13%
of the EPA limit 15 µg/L
worst single sample: 8 µg/L
21/40 SYR4 2012–2017
Nitrate
2570 µg/L 26%
of the EPA limit 10000 µg/L
 10/12 SYR4 2017–2019
TTHM
33.78 µg/L 42%
of the EPA limit 80 µg/L
worst single sample: 35.6 µg/L
8/8 SYR4 2013–2019
Arsenic
9 µg/L 90%
of the EPA limit 10 µg/L
 5/5 SYR4 2017–2019
Total Haloacetic Acids (HAA5)
15.635 µg/L 26%
of the EPA limit 60 µg/L
worst single sample: 17 µg/L
4/8 SYR4 2013–2019
Barium
80 µg/L 4%
of the EPA limit 2000 µg/L
 2/2 SYR4 2014
Gross Alpha, Excl. Radon And U
4.405 pCi/L 29%
of the EPA limit 15 pCi/L
worst single sample: 4.6 pCi/L
2/2 SYR4 2014
11 contaminants tested, none detected
Antimony, TotalBeryllium, TotalCadmiumChromiumCombined Radium (-226 And -228)Combined UraniumGross Beta Particle ActivityMercuryNitriteSeleniumThallium, Total

Utility contact

Contact
JUSTIN ASHER
Phone
6055742300
Email
[email protected]

Frequently asked questions about Hill City

Is Hill City tap water safe to drink?

EPA monitoring detected 9 contaminants in Hill City'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 Hill City's water?

EPA monitoring detected Copper, Lead, Lead, Nitrate, TTHM, and others. The full list with the level and data source for each is above.

How many people does Hill City serve?

Hill City reports serving 872 people in South Dakota, per its EPA record.

Has Hill City had any water quality violations?

The EPA has 244 violations on file for Hill City, of which 12 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.