Tap WaterIndex

← Ohio

Tap water quality report

Hillsboro, OH

EPA monitoring detected 19 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
35,071
people served
19
contaminants found
Ohio rankings Lead in Ohio PFAS in Ohio

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
1550 µg/L 16%
of the EPA limit 10000 µg/L
Main supplier: HIGHLAND COUNTY WATER COMPANY, INC. · 28,421 people · 2019
2/2 SYR4
Nitrate-Nitrite
1238.5 µg/L 12%
of the EPA limit 10000 µg/L
Main supplier: HIGHLAND COUNTY WATER COMPANY, INC. · 28,421 people · 2019
Highest in the city: 1380.1 µg/L — HILLSBORO CITY · 6,650 people · 2012
2/2 SYR4
Fluoride
1084 µg/L 27%
of the EPA limit 4000 µg/L
Main supplier: HIGHLAND COUNTY WATER COMPANY, INC. · 28,421 people · 2018
2/2 SYR4
Copper
811.8 µg/L 62%
of the EPA limit 1300 µg/L
Main supplier: HIGHLAND COUNTY WATER COMPANY, INC. · 28,421 people · 2018
2/2 SYR4
Nitrite
100 µg/L 10%
of the EPA limit 1000 µg/L
Highest in the city: HILLSBORO CITY · 6,650 people · 2012
1/2 SYR4
Barium
98.12 µg/L 4.9%
of the EPA limit 2000 µg/L
Main supplier: HIGHLAND COUNTY WATER COMPANY, INC. · 28,421 people · 2018
2/2 SYR4
TTHM
26.58 µg/L 33%
of the EPA limit 80 µg/L
Main supplier: HIGHLAND COUNTY WATER COMPANY, INC. · 28,421 people · 2019
Highest in the city: 82.93 µg/L — HILLSBORO CITY · 6,650 people · 2019
2/2 SYR4
Chloroform
15.18 µg/L
No EPA limit set
Main supplier: HIGHLAND COUNTY WATER COMPANY, INC. · 28,421 people · 2019
Highest in the city: 67.256 µg/L — HILLSBORO CITY · 6,650 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
11.4 µg/L 19%
of the EPA limit 60 µg/L
Main supplier: HIGHLAND COUNTY WATER COMPANY, INC. · 28,421 people · 2019
Highest in the city: 56.4275 µg/L — HILLSBORO CITY · 6,650 people · 2019
2/2 SYR4
Dichloroacetic Acid
6.36 µg/L
No EPA limit set
Main supplier: HIGHLAND COUNTY WATER COMPANY, INC. · 28,421 people · 2019
Highest in the city: 28.908 µg/L — HILLSBORO CITY · 6,650 people · 2019
2/2 SYR4
Trichloroacetic Acid
3.925 µg/L
No EPA limit set
Main supplier: HIGHLAND COUNTY WATER COMPANY, INC. · 28,421 people · 2019
Highest in the city: 23.4565 µg/L — HILLSBORO CITY · 6,650 people · 2019
2/2 SYR4
Monochloroacetic Acid
14.595 µg/L
No EPA limit set
Highest in the city: HILLSBORO CITY · 6,650 people · 2019
1/2 SYR4
Lead
13.56 µg/L 90%
of the EPA limit 15 µg/L
Main supplier: HIGHLAND COUNTY WATER COMPANY, INC. · 28,421 people · 2018
2/2 SYR4
Bromodichloromethane
8.22 µg/L
No EPA limit set
Main supplier: HIGHLAND COUNTY WATER COMPANY, INC. · 28,421 people · 2019
Highest in the city: 12.805 µg/L — HILLSBORO CITY · 6,650 people · 2019
2/2 SYR4
Dibromochloromethane
5.44 µg/L
No EPA limit set
Main supplier: HIGHLAND COUNTY WATER COMPANY, INC. · 28,421 people · 2019
2/2 SYR4
Dibromoacetic Acid
2.16 µg/L
No EPA limit set
Main supplier: HIGHLAND COUNTY WATER COMPANY, INC. · 28,421 people · 2019
Highest in the city: 3.47935 µg/L — HILLSBORO CITY · 6,650 people · 2019
2/2 SYR4
Bromoform
1.12 µg/L
No EPA limit set
Main supplier: HIGHLAND COUNTY WATER COMPANY, INC. · 28,421 people · 2019
1/2 SYR4
Atrazine
0.1575 µg/L 5.3%
of the EPA limit 3 µg/L
Highest in the city: HILLSBORO CITY · 6,650 people · 2019
1/2 SYR4
Lead
0.0017 mg/L 11%
of the EPA limit 0.0150 mg/L
Main supplier: HIGHLAND COUNTY WATER COMPANY, INC. · 28,421 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
HIGHLAND COUNTY WATER COMPANY, INC. 28,421
HILLSBORO CITY 6,650

Frequently asked questions about Hillsboro tap water

Is Hillsboro tap water safe to drink?

EPA testing detected 19 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, Ohio 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, Fluoride, Copper, 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.