What was found in Black River Falls'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 | 1082.5 µg/L 11% of the EPA limit 10000 µg/L Main supplier: SAND PILLOW · 5,230 people · 2019
Highest in the city: 10000 µg/L — HO-CHUNK CHE-NUNK · 132 people · 2019 | 9/9 | SYR4 |
| Nitrate-Nitrite | 390 µg/L 3.9% of the EPA limit 10000 µg/L Main supplier: SAND PILLOW · 5,230 people · 2015
Highest in the city: 8850 µg/L — HO-CHUNK CHE-NUNK · 132 people · 2018 | 6/9 | SYR4 |
| Nitrite | 8400 µg/L 840% of the EPA limit, at the 95th percentile of samples — 1000 µg/L Highest in the city: HO-CHUNK CHE-NUNK · 132 people · 2018 | 1/9 | SYR4 |
| Copper | 489.25 µg/L 38% of the EPA limit 1300 µg/L Main supplier: SAND PILLOW · 5,230 people · 2019
Highest in the city: 1850.5 µg/L — BLACK RIVER CORRECTIONAL CENTER · 163 people · 2017 | 9/9 | SYR4 |
| Fluoride | 729.5 µg/L 18% of the EPA limit 4000 µg/L Main supplier: SAND PILLOW · 5,230 people · 2018
Highest in the city: 1306 µg/L — BLACK RIVER FALLS WATERWORKS · 3,608 people · 2019 | 8/9 | SYR4 |
| Barium | 13.27 µg/L 0.7% of the EPA limit 2000 µg/L Main supplier: SAND PILLOW · 5,230 people · 2018
Highest in the city: 176 µg/L — BROCKWAY SANITARY DIST 1 · 2,692 people · 2017 | 9/9 | SYR4 |
| TTHM | 14.3 µg/L 18% of the EPA limit 80 µg/L Main supplier: SAND PILLOW · 5,230 people · 2019
Highest in the city: 27.625 µg/L — CEX' HA CI · 2,002 people · 2019 | 8/9 | SYR4 |
| Lead | 14.85 µg/L 99% of the EPA limit 15 µg/L Main supplier: SAND PILLOW · 5,230 people · 2019
Highest in the city: 26.275 µg/L — BROCKWAY SANITARY DIST 1 · 2,692 people · 2019 | 9/9 | SYR4 |
| Chloroform | 19.075 µg/L No EPA limit set Highest in the city: BROCKWAY SANITARY DIST 1 · 2,692 people · 2019 | 3/9 | SYR4 |
| Total Haloacetic Acids (HAA5) | 4.18 µg/L 7% of the EPA limit 60 µg/L Main supplier: SAND PILLOW · 5,230 people · 2019
Highest in the city: 19 µg/L — CEX' HA CI · 2,002 people · 2019 | 8/9 | SYR4 |
| Dichloroacetic Acid | 6.528 µg/L No EPA limit set Highest in the city: BLACK RIVER CORRECTIONAL CENTER · 163 people · 2019 | 3/9 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.2 pCi/L 8% of the EPA limit 15 pCi/L Main supplier: SAND PILLOW · 5,230 people · 2016
Highest in the city: 5.8 pCi/L — INDIAN HEIGHTS · 126 people · 2016 | 7/9 | SYR4 |
| Bromodichloromethane | 5.45 µg/L No EPA limit set Highest in the city: BROCKWAY SANITARY DIST 1 · 2,692 people · 2019 | 3/9 | SYR4 |
| Combined Radium (-226 And -228) | 1.27 pCi/L 25% of the EPA limit 5 pCi/L Main supplier: SAND PILLOW · 5,230 people · 2016
Highest in the city: 4.09 pCi/L — INDIAN HEIGHTS · 126 people · 2019 | 8/9 | SYR4 |
| Dibromochloromethane | 3.66 µg/L No EPA limit set Highest in the city: BROCKWAY SANITARY DIST 1 · 2,692 people · 2019 | 2/9 | SYR4 |
| Trichloroacetic Acid | 3.574 µg/L No EPA limit set Highest in the city: BROCKWAY SANITARY DIST 1 · 2,692 people · 2019 | 3/9 | SYR4 |
| Monochloroacetic Acid | 3.07 µg/L No EPA limit set Highest in the city: BROCKWAY SANITARY DIST 1 · 2,692 people · 2019 | 2/9 | SYR4 |
| Arsenic | 1.5 µg/L 15% of the EPA limit 10 µg/L Highest in the city: HO CHUNK VILLAGE · 196 people · 2018 | 2/9 | SYR4 |
| Mercury | 1.1 µg/L 55% of the EPA limit 2 µg/L Highest in the city: CEX' HA CI · 2,002 people · 2018 | 1/9 | SYR4 |
| Selenium | 1 µg/L 2% of the EPA limit 50 µg/L Highest in the city: BLUE SPRUCE MOBILE HOME COMMUNITY · 80 people · 2018 | 1/9 | SYR4 |
| Bromoform | 0.6525 µg/L No EPA limit set Highest in the city: BROCKWAY SANITARY DIST 1 · 2,692 people · 2019 | 1/9 | SYR4 |
| Dibromoacetic Acid | 0.4370 µg/L No EPA limit set Highest in the city: BLACK RIVER FALLS WATERWORKS · 3,608 people · 2019 | 1/9 | SYR4 |
| Beryllium, Total | 0.4200 µg/L 11% of the EPA limit 4 µg/L Highest in the city: INDIAN HEIGHTS · 126 people · 2018 | 1/9 | SYR4 |
| Xylenes, Total | 0.1600 µg/L 0% of the EPA limit 10000 µg/L Highest in the city: BROCKWAY SANITARY DIST 1 · 2,692 people · 2019 | 1/9 | SYR4 |
| Cadmium | 0.1200 µg/L 2.4% of the EPA limit 5 µg/L Main supplier: SAND PILLOW · 5,230 people · 2018
Highest in the city: 0.1300 µg/L — INDIAN HEIGHTS · 126 people · 2018 | 3/9 | SYR4 |
| Styrene | 0.1200 µg/L 0.1% of the EPA limit 100 µg/L Highest in the city: BROCKWAY SANITARY DIST 1 · 2,692 people · 2019 | 1/9 | SYR4 |
| Lead | 0.0044 mg/L 29% of the EPA limit 0.0150 mg/L Main supplier: SAND PILLOW · 5,230 people · 2025
Highest in the city: 0.0054 mg/L — HO-CHUNK CHE-NUNK · 132 people · 2025 | 9/9 | 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 Black River Falls
| Supplier | Population served |
|---|---|
| SAND PILLOW | 5,230 |
| BLACK RIVER FALLS WATERWORKS | 3,608 |
| BROCKWAY SANITARY DIST 1 | 2,692 |
| CEX' HA CI | 2,002 |
| HO CHUNK VILLAGE | 196 |
| BLACK RIVER CORRECTIONAL CENTER | 163 |
| HO-CHUNK CHE-NUNK | 132 |
| INDIAN HEIGHTS | 126 |
| BLUE SPRUCE MOBILE HOME COMMUNITY | 80 |
Frequently asked questions about Black River Falls tap water
Is Black River Falls tap water safe to drink?
EPA testing detected 27 contaminants in the water serving Black River Falls. 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 Black River Falls?
9 public water suppliers report drinking-water monitoring for Black River Falls, Wisconsin to the EPA. Each is listed above with its population served.
What contaminants are in Black River Falls's water?
The contaminants EPA monitoring detected in Black River Falls include Nitrate, Nitrate-Nitrite, Nitrite, Copper, Fluoride. 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.