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Tap water quality report

Janesville, WI

EPA monitoring detected 22 contaminants across the 3 water suppliers serving Janesville. 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.

3
water suppliers
65,913
people served
22
contaminants found
Wisconsin rankings Lead in Wisconsin PFAS in Wisconsin

What was found in Janesville'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-Nitrite
11725 µg/L 117%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2017
1/3 SYR4
Nitrate
8700 µg/L 87%
of the EPA limit 10000 µg/L
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2019
2/3 SYR4
Fluoride
940 µg/L 24%
of the EPA limit 4000 µg/L
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2019
3/3 SYR4
Copper
244.5 µg/L 19%
of the EPA limit 1300 µg/L
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2017
3/3 SYR4
Barium
55.65 µg/L 2.8%
of the EPA limit 2000 µg/L
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2017
3/3 SYR4
TTHM
16.54 µg/L 21%
of the EPA limit 80 µg/L
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2019
1/3 SYR4
Cyanide
15 µg/L 7.5%
of the EPA limit 200 µg/L
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2017
1/3 SYR4
Lead
9.535 µg/L 64%
of the EPA limit 15 µg/L
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2017
2/3 SYR4
Gross Alpha, Excl. Radon And U
6.48 pCi/L 43%
of the EPA limit 15 pCi/L
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2014
3/3 SYR4
Dibromochloromethane
5.58 µg/L
No EPA limit set
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2019
1/3 SYR4
Bromoform
5.195 µg/L
No EPA limit set
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2019
1/3 SYR4
Xylenes, Total
4.4 µg/L 0%
of the EPA limit 10000 µg/L
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2019
1/3 SYR4
Bromodichloromethane
4.1 µg/L
No EPA limit set
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2019
1/3 SYR4
Combined Radium (-226 And -228)
1.8904 pCi/L 38%
of the EPA limit 5 pCi/L
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2014
Highest in the city: 3.512 pCi/L — CARAVILLA EDUCATION AND REHAB CENTER · 298 people · 2015
3/3 SYR4
Chloroform
3.02 µg/L
No EPA limit set
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2019
1/3 SYR4
Gross Beta Particle Activity
2.379 pCi/L
No EPA limit set
Highest in the city: CARAVILLA EDUCATION AND REHAB CENTER · 298 people · 2015
1/3 SYR4
Total Haloacetic Acids (HAA5)
1.479 µg/L 2.5%
of the EPA limit 60 µg/L
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2019
2/3 SYR4
Toluene
1.3 µg/L 0.1%
of the EPA limit 1000 µg/L
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2019
2/3 SYR4
Dibromoacetic Acid
1.125 µg/L
No EPA limit set
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2019
1/3 SYR4
Ethylbenzene
0.9000 µg/L 0.1%
of the EPA limit 700 µg/L
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2019
1/3 SYR4
Dichloroacetic Acid
0.5430 µg/L
No EPA limit set
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2019
1/3 SYR4
Lead
0.0100 mg/L 67%
of the EPA limit 0.0150 mg/L
Main supplier: JANESVILLE WATER UTILITY · 64,415 people · 2020
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 Janesville

SupplierPopulation served
JANESVILLE WATER UTILITY 64,415
ROCKVALE MHP 1,200
CARAVILLA EDUCATION AND REHAB CENTER 298

Frequently asked questions about Janesville tap water

Is Janesville tap water safe to drink?

EPA testing detected 22 contaminants in the water serving Janesville. 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 Janesville?

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

What contaminants are in Janesville's water?

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