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Tap water quality report

Hill City, SD

EPA monitoring detected 10 contaminants across the 3 water suppliers serving Hill City. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

3
water suppliers
1,472
people served
10
contaminants found
South Dakota rankings Lead in South Dakota PFAS in South Dakota

What was found in Hill City's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
2570 µg/L 26%
of the EPA limit 10000 µg/L
Main supplier: HILL CITY · 872 people · 2019
1/3 SYR4
Copper
991.5999999999998 µg/L 76%
of the EPA limit 1300 µg/L
Main supplier: HILL CITY · 872 people · 2017
3/3 SYR4
Fluoride
200 µg/L 5%
of the EPA limit 4000 µg/L
Highest in the city: APPLE SPRINGS SUBDIVISION · 180 people · 2019
1/3 SYR4
Barium
80 µg/L 4%
of the EPA limit 2000 µg/L
Main supplier: HILL CITY · 872 people · 2014
Highest in the city: 133 µg/L — APPLE SPRINGS SUBDIVISION · 180 people · 2019
2/3 SYR4
TTHM
33.78 µg/L 42%
of the EPA limit 80 µg/L
Main supplier: HILL CITY · 872 people · 2019
3/3 SYR4
Total Haloacetic Acids (HAA5)
15.634999999999998 µg/L 26%
of the EPA limit 60 µg/L
Main supplier: HILL CITY · 872 people · 2019
1/3 SYR4
Gross Alpha, Excl. Radon And U
4.404999999999999 pCi/L 29%
of the EPA limit 15 pCi/L
Main supplier: HILL CITY · 872 people · 2014
Highest in the city: 13.3 pCi/L — HERMOSA-OLD SYSTEM · 420 people · 2017
3/3 SYR4
Arsenic
9 µg/L 90%
of the EPA limit 10 µg/L
Main supplier: HILL CITY · 872 people · 2019
1/3 SYR4
Lead
2 µg/L 13%
of the EPA limit 15 µg/L
Main supplier: HILL CITY · 872 people · 2017
3/3 SYR4
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
Main supplier: HILL CITY · 872 people · 2025
Highest in the city: 0.0070 mg/L — HERMOSA-OLD SYSTEM · 420 people · 2023
3/3 LCR
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 the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Hill City

SupplierPopulation served
HILL CITY 872
HERMOSA-OLD SYSTEM 420
APPLE SPRINGS SUBDIVISION 180

Frequently asked questions about Hill City tap water

Is Hill City tap water safe to drink?

EPA testing detected 10 contaminants in the water serving Hill City. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Hill City?

3 public water suppliers report drinking-water monitoring for Hill City, South Dakota to the EPA. Each is listed above with its population served.

What contaminants are in Hill City's water?

The contaminants EPA monitoring detected in Hill City include Nitrate, Copper, Fluoride, Barium, TTHM. The full list, with the level at the main supplier and the data source, is in the table above.

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.