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Tap water quality report

Hillsboro, WI

EPA monitoring detected 20 contaminants across the 2 water suppliers serving Hillsboro. 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
1,385
people served
20
contaminants found
Wisconsin rankings Lead in Wisconsin PFAS in Wisconsin

What was found in Hillsboro'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
2615 µg/L 26%
of the EPA limit 10000 µg/L
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2019
Highest in the city: 5550 µg/L — MARELL COURTS AND RENTALS LLC · 60 people · 2019
2/2 SYR4
Nitrate-Nitrite
2550 µg/L 26%
of the EPA limit 10000 µg/L
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2017
2/2 SYR4
Copper
1702 µg/L 131%
of the EPA limit, at the 95th percentile of samples — 1300 µg/L
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2019
2/2 SYR4
Fluoride
249.5 µg/L 6.2%
of the EPA limit 4000 µg/L
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2017
2/2 SYR4
Barium
52.21 µg/L 2.6%
of the EPA limit 2000 µg/L
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2017
2/2 SYR4
Lead
15.19 µg/L 101%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2019
2/2 SYR4
TTHM
7.83 µg/L 9.8%
of the EPA limit 80 µg/L
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2019
1/2 SYR4
trans-1,2-Dichloroethylene
7.24 µg/L 7.2%
of the EPA limit 100 µg/L
Highest in the city: MARELL COURTS AND RENTALS LLC · 60 people · 2019
1/2 SYR4
Gross Alpha, Excl. Radon And U
5.34 pCi/L 36%
of the EPA limit 15 pCi/L
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2017
2/2 SYR4
Combined Radium (-226 And -228)
4.3225 pCi/L 86%
of the EPA limit 5 pCi/L
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2017
2/2 SYR4
Gross Beta Particle Activity
4 pCi/L
No EPA limit set
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2014
1/2 SYR4
Dibromochloromethane
3.035 µg/L
No EPA limit set
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2019
1/2 SYR4
Bromoform
2.435 µg/L
No EPA limit set
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2019
1/2 SYR4
Bromodichloromethane
1.875 µg/L
No EPA limit set
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2019
1/2 SYR4
Chloroform
1.2 µg/L
No EPA limit set
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2019
1/2 SYR4
Total Haloacetic Acids (HAA5)
0.8875 µg/L 1.5%
of the EPA limit 60 µg/L
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2019
1/2 SYR4
Dibromoacetic Acid
0.5400 µg/L
No EPA limit set
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2019
1/2 SYR4
Trichloroacetic Acid
0.2900 µg/L
No EPA limit set
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2019
1/2 SYR4
Dichloroacetic Acid
0.2800 µg/L
No EPA limit set
Main supplier: HILLSBORO WATERWORKS · 1,325 people · 2019
1/2 SYR4
Lead
0.0032 mg/L 21%
of the EPA limit 0.0150 mg/L
Main supplier: HILLSBORO WATERWORKS · 1,325 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 Hillsboro

SupplierPopulation served
HILLSBORO WATERWORKS 1,325
MARELL COURTS AND RENTALS LLC 60

Frequently asked questions about Hillsboro tap water

Is Hillsboro tap water safe to drink?

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

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

What contaminants are in Hillsboro's water?

The contaminants EPA monitoring detected in Hillsboro 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.