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Tap water quality report

New Underwood, SD

EPA monitoring detected 8 contaminants across the 4 water suppliers serving New Underwood. 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.

4
water suppliers
1,143
people served
8
contaminants found
South Dakota rankings Lead in South Dakota PFAS in South Dakota

What was found in New Underwood'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
Fluoride
595 µg/L 15%
of the EPA limit 4000 µg/L
Highest in the city: VIEWFIELD RURAL WATER SYSTEM · 220 people · 2015
2/4 SYR4
Copper
249.75 µg/L 19%
of the EPA limit 1300 µg/L
Main supplier: NEW UNDERWOOD · 679 people · 2017
4/4 SYR4
Barium
58.75 µg/L 2.9%
of the EPA limit 2000 µg/L
Highest in the city: VIEWFIELD RURAL WATER SYSTEM · 220 people · 2015
2/4 SYR4
Gross Alpha, Excl. Radon And U
48.875 pCi/L 326%
of the EPA limit, at the 95th percentile of samples — 15 pCi/L
Highest in the city: VIEWFIELD RURAL WATER SYSTEM · 220 people · 2019
2/4 SYR4
TTHM
3.89 µg/L 4.9%
of the EPA limit 80 µg/L
Main supplier: NEW UNDERWOOD · 679 people · 2019
2/4 SYR4
Lead
3.15 µg/L 21%
of the EPA limit 15 µg/L
Main supplier: NEW UNDERWOOD · 679 people · 2017
Highest in the city: 3.3 µg/L — COPPER OAKS I · 64 people · 2019
4/4 SYR4
Chromium
1 µg/L 1%
of the EPA limit 100 µg/L
Highest in the city: OAKS WATER USERS ASSOCIATION · 180 people · 2014
1/4 SYR4
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
Main supplier: NEW UNDERWOOD · 679 people · 2023
Highest in the city: 0.0050 mg/L — VIEWFIELD RURAL WATER SYSTEM · 220 people · 2025
4/4 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 New Underwood

SupplierPopulation served
NEW UNDERWOOD 679
VIEWFIELD RURAL WATER SYSTEM 220
OAKS WATER USERS ASSOCIATION 180
COPPER OAKS I 64

Frequently asked questions about New Underwood tap water

Is New Underwood tap water safe to drink?

EPA testing detected 8 contaminants in the water serving New Underwood. 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 New Underwood?

4 public water suppliers report drinking-water monitoring for New Underwood, South Dakota to the EPA. Each is listed above with its population served.

What contaminants are in New Underwood's water?

The contaminants EPA monitoring detected in New Underwood include Fluoride, Copper, Barium, Gross Alpha, Excl. Radon And U, 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.