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Tap water quality report

Lake Mills, WI

EPA monitoring detected 22 contaminants across the 2 water suppliers serving Lake Mills. 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
6,371
people served
22
contaminants found
Wisconsin rankings Lead in Wisconsin PFAS in Wisconsin

What was found in Lake Mills'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
Nitrate
2600 µg/L 26%
of the EPA limit 10000 µg/L
Highest in the city: LAKEWOOD VILLAGE · 160 people · 2017
1/2 SYR4
Nitrate-Nitrite
2319.5 µg/L 23%
of the EPA limit 10000 µg/L
Highest in the city: LAKEWOOD VILLAGE · 160 people · 2019
1/2 SYR4
Copper
1500 µg/L 115%
of the EPA limit, at the 95th percentile of samples — 1300 µg/L
Main supplier: LAKE MILLS WATERWORKS · 6,211 people · 2019
2/2 SYR4
Fluoride
1240 µg/L 31%
of the EPA limit 4000 µg/L
Main supplier: LAKE MILLS WATERWORKS · 6,211 people · 2019
2/2 SYR4
Barium
100 µg/L 5%
of the EPA limit 2000 µg/L
Main supplier: LAKE MILLS WATERWORKS · 6,211 people · 2017
Highest in the city: 148 µg/L — LAKEWOOD VILLAGE · 160 people · 2018
2/2 SYR4
Lead
118 µg/L 787%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: LAKE MILLS WATERWORKS · 6,211 people · 2019
2/2 SYR4
Gross Alpha, Excl. Radon And U
10.8545 pCi/L 72%
of the EPA limit 15 pCi/L
Main supplier: LAKE MILLS WATERWORKS · 6,211 people · 2019
2/2 SYR4
TTHM
9.4 µg/L 12%
of the EPA limit 80 µg/L
Main supplier: LAKE MILLS WATERWORKS · 6,211 people · 2019
1/2 SYR4
Combined Radium (-226 And -228)
6.513 pCi/L 130%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Main supplier: LAKE MILLS WATERWORKS · 6,211 people · 2019
2/2 SYR4
Chloroform
5.44 µg/L
No EPA limit set
Main supplier: LAKE MILLS WATERWORKS · 6,211 people · 2019
1/2 SYR4
Total Haloacetic Acids (HAA5)
4.892 µg/L 8.2%
of the EPA limit 60 µg/L
Main supplier: LAKE MILLS WATERWORKS · 6,211 people · 2019
1/2 SYR4
Chromium
3.48 µg/L 3.5%
of the EPA limit 100 µg/L
Highest in the city: LAKEWOOD VILLAGE · 160 people · 2018
1/2 SYR4
Dichloroacetic Acid
3 µg/L
No EPA limit set
Main supplier: LAKE MILLS WATERWORKS · 6,211 people · 2019
1/2 SYR4
Xylenes, Total
2.8 µg/L 0%
of the EPA limit 10000 µg/L
Main supplier: LAKE MILLS WATERWORKS · 6,211 people · 2019
1/2 SYR4
Bromodichloromethane
2.7 µg/L
No EPA limit set
Main supplier: LAKE MILLS WATERWORKS · 6,211 people · 2019
1/2 SYR4
Dibromochloromethane
1.27 µg/L
No EPA limit set
Main supplier: LAKE MILLS WATERWORKS · 6,211 people · 2019
1/2 SYR4
Trichloroacetic Acid
1.2 µg/L
No EPA limit set
Main supplier: LAKE MILLS WATERWORKS · 6,211 people · 2019
1/2 SYR4
Combined Uranium
1.0502 µg/L 3.5%
of the EPA limit 30 µg/L
Main supplier: LAKE MILLS WATERWORKS · 6,211 people · 2019
1/2 SYR4
Monobromoacetic Acid
0.7315 µg/L
No EPA limit set
Main supplier: LAKE MILLS WATERWORKS · 6,211 people · 2019
1/2 SYR4
Dibromoacetic Acid
0.6860 µg/L
No EPA limit set
Main supplier: LAKE MILLS WATERWORKS · 6,211 people · 2019
1/2 SYR4
Styrene
0.3400 µg/L 0.3%
of the EPA limit 100 µg/L
Highest in the city: LAKEWOOD VILLAGE · 160 people · 2018
1/2 SYR4
Lead
0.0046 mg/L 31%
of the EPA limit 0.0150 mg/L
Main supplier: LAKE MILLS WATERWORKS · 6,211 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 Lake Mills

SupplierPopulation served
LAKE MILLS WATERWORKS 6,211
LAKEWOOD VILLAGE 160

Frequently asked questions about Lake Mills tap water

Is Lake Mills tap water safe to drink?

EPA testing detected 22 contaminants in the water serving Lake Mills. 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 Lake Mills?

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

What contaminants are in Lake Mills's water?

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