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Tap water quality report

Monroe, WI

EPA monitoring detected 20 contaminants across the 3 water suppliers serving Monroe. 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
11,086
people served
20
contaminants found
Wisconsin rankings Lead in Wisconsin PFAS in Wisconsin

What was found in Monroe'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
229 µg/L 2.3%
of the EPA limit 10000 µg/L
Main supplier: MONROE WATERWORKS · 10,780 people · 2017
Highest in the city: 1629.5 µg/L — VAN-GOGH HOMES LLC · 46 people · 2019
3/3 SYR4
Nitrate
545.5 µg/L 5.5%
of the EPA limit 10000 µg/L
Main supplier: MONROE WATERWORKS · 10,780 people · 2019
Highest in the city: 1570 µg/L — VAN-GOGH HOMES LLC · 46 people · 2019
3/3 SYR4
Fluoride
1090 µg/L 27%
of the EPA limit 4000 µg/L
Main supplier: MONROE WATERWORKS · 10,780 people · 2019
3/3 SYR4
Copper
181 µg/L 14%
of the EPA limit 1300 µg/L
Main supplier: MONROE WATERWORKS · 10,780 people · 2017
Highest in the city: 216.7 µg/L — VAN-GOGH HOMES LLC · 46 people · 2018
3/3 SYR4
Barium
102.55 µg/L 5.1%
of the EPA limit 2000 µg/L
Main supplier: MONROE WATERWORKS · 10,780 people · 2017
3/3 SYR4
Lead
14 µg/L 93%
of the EPA limit 15 µg/L
Main supplier: MONROE WATERWORKS · 10,780 people · 2017
3/3 SYR4
Gross Alpha, Excl. Radon And U
10.7 pCi/L 71%
of the EPA limit 15 pCi/L
Main supplier: MONROE WATERWORKS · 10,780 people · 2017
2/3 SYR4
Combined Radium (-226 And -228)
8.605 pCi/L 172%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
Main supplier: MONROE WATERWORKS · 10,780 people · 2017
3/3 SYR4
TTHM
5.79 µg/L 7.2%
of the EPA limit 80 µg/L
Main supplier: MONROE WATERWORKS · 10,780 people · 2019
2/3 SYR4
Chloroform
4.445 µg/L
No EPA limit set
Main supplier: MONROE WATERWORKS · 10,780 people · 2019
1/3 SYR4
Toluene
3.9 µg/L 0.4%
of the EPA limit 1000 µg/L
Main supplier: MONROE WATERWORKS · 10,780 people · 2017
1/3 SYR4
Arsenic
2.3 µg/L 23%
of the EPA limit 10 µg/L
Main supplier: MONROE WATERWORKS · 10,780 people · 2017
1/3 SYR4
Bromodichloromethane
1.475 µg/L
No EPA limit set
Main supplier: MONROE WATERWORKS · 10,780 people · 2019
1/3 SYR4
Dibromochloromethane
1.34 µg/L
No EPA limit set
Main supplier: MONROE WATERWORKS · 10,780 people · 2019
1/3 SYR4
Total Haloacetic Acids (HAA5)
0.7066 µg/L 1.2%
of the EPA limit 60 µg/L
Main supplier: MONROE WATERWORKS · 10,780 people · 2019
Highest in the city: 1.241 µg/L — PLEASANT VIEW NURSING HOME · 260 people · 2019
2/3 SYR4
Combined Uranium
1.19 µg/L 4%
of the EPA limit 30 µg/L
Main supplier: MONROE WATERWORKS · 10,780 people · 2017
1/3 SYR4
Dichloroacetic Acid
0.4870 µg/L
No EPA limit set
Main supplier: MONROE WATERWORKS · 10,780 people · 2019
Highest in the city: 1.094 µg/L — PLEASANT VIEW NURSING HOME · 260 people · 2019
2/3 SYR4
Bromoform
0.7635 µg/L
No EPA limit set
Main supplier: MONROE WATERWORKS · 10,780 people · 2019
1/3 SYR4
Trichloroacetic Acid
0.4400 µg/L
No EPA limit set
Main supplier: MONROE WATERWORKS · 10,780 people · 2019
1/3 SYR4
Lead
0.0047 mg/L 31%
of the EPA limit 0.0150 mg/L
Main supplier: MONROE WATERWORKS · 10,780 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 Monroe

SupplierPopulation served
MONROE WATERWORKS 10,780
PLEASANT VIEW NURSING HOME 260
VAN-GOGH HOMES LLC 46

Frequently asked questions about Monroe tap water

Is Monroe tap water safe to drink?

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

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

What contaminants are in Monroe's water?

The contaminants EPA monitoring detected in Monroe 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.