Tap WaterIndex

← Wisconsin

Tap water quality report

Elkhorn, WI

EPA monitoring detected 20 contaminants across the 2 water suppliers serving Elkhorn. 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
10,417
people served
20
contaminants found
Wisconsin rankings Lead in Wisconsin PFAS in Wisconsin

What was found in Elkhorn'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
1100 µg/L 85%
of the EPA limit 1300 µg/L
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2017
2/2 SYR4
Barium
1069.5 µg/L 53%
of the EPA limit 2000 µg/L
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2017
2/2 SYR4
Fluoride
1066 µg/L 27%
of the EPA limit 4000 µg/L
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2017
2/2 SYR4
Nitrate
720 µg/L 7.2%
of the EPA limit 10000 µg/L
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2019
2/2 SYR4
Nitrate-Nitrite
94.7 µg/L 0.9%
of the EPA limit 10000 µg/L
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2017
1/2 SYR4
Chloroform
51.9 µg/L
No EPA limit set
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2019
2/2 SYR4
Arsenic
49.25 µg/L 493%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2019
2/2 SYR4
TTHM
41.106 µg/L 51%
of the EPA limit 80 µg/L
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
18.069 µg/L 30%
of the EPA limit 60 µg/L
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2019
2/2 SYR4
Lead
7.71 µg/L 51%
of the EPA limit 15 µg/L
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2017
Highest in the city: 10.75 µg/L — LUDWELL ESTATES · 100 people · 2018
2/2 SYR4
Gross Alpha, Excl. Radon And U
10.195 pCi/L 68%
of the EPA limit 15 pCi/L
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2019
1/2 SYR4
Trichloroacetic Acid
9.85 µg/L
No EPA limit set
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2019
2/2 SYR4
Bromodichloromethane
5.36 µg/L
No EPA limit set
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2019
Highest in the city: 9.8 µg/L — LUDWELL ESTATES · 100 people · 2019
2/2 SYR4
Combined Radium (-226 And -228)
9.6725 pCi/L 193%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2019
2/2 SYR4
Dichloroacetic Acid
8.37 µg/L
No EPA limit set
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2019
Highest in the city: 8.4 µg/L — LUDWELL ESTATES · 100 people · 2019
2/2 SYR4
Dibromochloromethane
1.773 µg/L
No EPA limit set
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2019
Highest in the city: 3.1 µg/L — LUDWELL ESTATES · 100 people · 2019
2/2 SYR4
Dichloromethane
1.2 µg/L 24%
of the EPA limit 5 µg/L
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2019
1/2 SYR4
Dibromoacetic Acid
0.1600 µg/L
No EPA limit set
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2019
Highest in the city: 0.8680 µg/L — LUDWELL ESTATES · 100 people · 2019
2/2 SYR4
Combined Uranium
0.2507 µg/L 0.8%
of the EPA limit 30 µg/L
Main supplier: ELKHORN WATERWORKS · 10,317 people · 2017
1/2 SYR4
Lead
0.0140 mg/L 93%
of the EPA limit 0.0150 mg/L
Main supplier: ELKHORN WATERWORKS · 10,317 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 Elkhorn

SupplierPopulation served
ELKHORN WATERWORKS 10,317
LUDWELL ESTATES 100

Frequently asked questions about Elkhorn tap water

Is Elkhorn tap water safe to drink?

EPA testing detected 20 contaminants in the water serving Elkhorn. 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 Elkhorn?

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

What contaminants are in Elkhorn's water?

The contaminants EPA monitoring detected in Elkhorn include Copper, Barium, Fluoride, Nitrate, Nitrate-Nitrite. 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.