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Tap water quality report

Owanka, SD

EPA monitoring detected 8 contaminants across the 2 water suppliers serving Owanka. 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.

2
water suppliers
103
people served
8
contaminants found
South Dakota rankings Lead in South Dakota PFAS in South Dakota

What was found in Owanka'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
1500 µg/L 38%
of the EPA limit 4000 µg/L
Main supplier: OWANKA RURAL WATER SYSTEM · 52 people · 2017
2/2 SYR4
Copper
180.2 µg/L 14%
of the EPA limit 1300 µg/L
Main supplier: OWANKA RURAL WATER SYSTEM · 52 people · 2019
2/2 SYR4
Barium
15 µg/L 0.8%
of the EPA limit 2000 µg/L
Main supplier: OWANKA RURAL WATER SYSTEM · 52 people · 2017
Highest in the city: 22 µg/L — LAKESIDE WATER USERS DISTRICT · 51 people · 2013
2/2 SYR4
Gross Alpha, Excl. Radon And U
10.194 pCi/L 68%
of the EPA limit 15 pCi/L
Main supplier: OWANKA RURAL WATER SYSTEM · 52 people · 2019
2/2 SYR4
Lead
4.6 µg/L 31%
of the EPA limit 15 µg/L
Main supplier: OWANKA RURAL WATER SYSTEM · 52 people · 2019
2/2 SYR4
TTHM
3.8475 µg/L 4.8%
of the EPA limit 80 µg/L
Main supplier: OWANKA RURAL WATER SYSTEM · 52 people · 2019
1/2 SYR4
Chromium
1 µg/L 1%
of the EPA limit 100 µg/L
Highest in the city: LAKESIDE WATER USERS DISTRICT · 51 people · 2013
1/2 SYR4
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
Main supplier: OWANKA RURAL WATER SYSTEM · 52 people · 2025
2/2 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 Owanka

SupplierPopulation served
OWANKA RURAL WATER SYSTEM 52
LAKESIDE WATER USERS DISTRICT 51

Frequently asked questions about Owanka tap water

Is Owanka tap water safe to drink?

EPA testing detected 8 contaminants in the water serving Owanka. 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 Owanka?

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

What contaminants are in Owanka's water?

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