Is Belle Fourche, SD Tap Water Safe? Quality & Contaminants

What was found in Belle Fourche'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.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate	784 µg/L 7.8% of the EPA limit 10000 µg/L Main supplier: BELLE FOURCHE · 5,617 people · 2018	2/3	SYR4
Fluoride	300 µg/L 7.5% of the EPA limit 4000 µg/L Highest in the city: BLACK HILLS WATER DISTRIBUTION, LLC · 135 people · 2013	1/3	SYR4
Copper	194.5999999999999 µg/L 15% of the EPA limit 1300 µg/L Main supplier: BELLE FOURCHE · 5,617 people · 2018 Highest in the city: 290.7999999999997 µg/L — HAY CREEK WATER COMPANY · 323 people · 2019	2/3	SYR4
Barium	193 µg/L 9.7% of the EPA limit 2000 µg/L Main supplier: BELLE FOURCHE · 5,617 people · 2018	2/3	SYR4
Lead	6.049999999999997 µg/L 40% of the EPA limit 15 µg/L Main supplier: BELLE FOURCHE · 5,617 people · 2018 Highest in the city: 15.359999999999996 µg/L — HAY CREEK WATER COMPANY · 323 people · 2019	2/3	SYR4
TTHM	7.962999999999999 µg/L 10% of the EPA limit 80 µg/L Main supplier: BELLE FOURCHE · 5,617 people · 2019	1/3	SYR4
Gross Alpha, Excl. Radon And U	5.5 pCi/L 37% of the EPA limit 15 pCi/L Highest in the city: BLACK HILLS WATER DISTRIBUTION, LLC · 135 people · 2016	1/3	SYR4
Arsenic	5 µg/L 50% of the EPA limit 10 µg/L Main supplier: BELLE FOURCHE · 5,617 people · 2018	1/3	SYR4
Total Haloacetic Acids (HAA5)	1.03 µg/L 1.7% of the EPA limit 60 µg/L Highest in the city: HAY CREEK WATER COMPANY · 323 people · 2019	1/3	SYR4
Chromium	1 µg/L 1% of the EPA limit 100 µg/L Highest in the city: BLACK HILLS WATER DISTRIBUTION, LLC · 135 people · 2013	1/3	SYR4
Mercury	0.2000 µg/L 10% of the EPA limit 2 µg/L Highest in the city: BLACK HILLS WATER DISTRIBUTION, LLC · 135 people · 2013	1/3	SYR4
Lead	0.0030 mg/L 20% of the EPA limit 0.0150 mg/L Main supplier: BELLE FOURCHE · 5,617 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 Belle Fourche

Supplier	Population served
BELLE FOURCHE	5,617
HAY CREEK WATER COMPANY	323
BLACK HILLS WATER DISTRIBUTION, LLC	135

Frequently asked questions about Belle Fourche tap water

Is Belle Fourche tap water safe to drink?

EPA testing detected 12 contaminants in the water serving Belle Fourche. 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 Belle Fourche?

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

What contaminants are in Belle Fourche's water?

The contaminants EPA monitoring detected in Belle Fourche include Nitrate, Fluoride, Copper, Barium, 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.