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Tap water quality report

Bison, SD

EPA monitoring detected 5 contaminants across the 2 water suppliers serving Bison. 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
780
people served
5
contaminants found
South Dakota rankings Lead in South Dakota PFAS in South Dakota

What was found in Bison'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
Copper
70 µg/L 5.4%
of the EPA limit 1300 µg/L
Main supplier: PERKINS COUNTY RURAL WATER · 470 people · 2019
Highest in the city: 346.9 µg/L — BISON · 310 people · 2017
2/2 SYR4
Total Haloacetic Acids (HAA5)
25.68 µg/L 43%
of the EPA limit 60 µg/L
Main supplier: PERKINS COUNTY RURAL WATER · 470 people · 2019
2/2 SYR4
TTHM
16.51 µg/L 21%
of the EPA limit 80 µg/L
Main supplier: PERKINS COUNTY RURAL WATER · 470 people · 2019
2/2 SYR4
Lead
0.5025 µg/L 3.4%
of the EPA limit 15 µg/L
Main supplier: PERKINS COUNTY RURAL WATER · 470 people · 2019
Highest in the city: 1.935 µg/L — BISON · 310 people · 2017
2/2 SYR4
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
Main supplier: PERKINS COUNTY RURAL WATER · 470 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 Bison

SupplierPopulation served
PERKINS COUNTY RURAL WATER 470
BISON 310

Frequently asked questions about Bison tap water

Is Bison tap water safe to drink?

EPA testing detected 5 contaminants in the water serving Bison. 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 Bison?

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

What contaminants are in Bison's water?

The contaminants EPA monitoring detected in Bison include Copper, Total Haloacetic Acids (HAA5), TTHM, Lead, 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.