Tap WaterIndex

← Illinois

Tap water quality report

Hardin, IL

EPA monitoring detected 21 contaminants across the 2 water suppliers serving Hardin. 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
5,514
people served
21
contaminants found
Illinois rankings Lead in Illinois PFAS in Illinois

What was found in Hardin'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
Copper
396.49999999999966 µg/L 30%
of the EPA limit 1300 µg/L
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2018
Highest in the city: 1400 µg/L — IL AMERICAN-HARDIN · 839 people · 2019
2/2 SYR4
Fluoride
996 µg/L 25%
of the EPA limit 4000 µg/L
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2018
2/2 SYR4
Nitrate
40 µg/L 0.4%
of the EPA limit 10000 µg/L
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2019
Highest in the city: 390 µg/L — IL AMERICAN-HARDIN · 839 people · 2019
2/2 SYR4
Barium
338 µg/L 17%
of the EPA limit 2000 µg/L
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2018
2/2 SYR4
Nitrate-Nitrite
20 µg/L 0.2%
of the EPA limit 10000 µg/L
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2012
Highest in the city: 156 µg/L — IL AMERICAN-HARDIN · 839 people · 2015
2/2 SYR4
TTHM
113.97999999999999 µg/L 142%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2019
2/2 SYR4
Chloroform
57.43499999999999 µg/L
No EPA limit set
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
36.865 µg/L 61%
of the EPA limit 60 µg/L
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2019
2/2 SYR4
Lithium
36 µg/L
No EPA limit set
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2025
1/2 UCMR-5
Bromodichloromethane
34.33499999999999 µg/L
No EPA limit set
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2019
2/2 SYR4
Dichloroacetic Acid
21.779999999999998 µg/L
No EPA limit set
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2019
2/2 SYR4
Dibromochloromethane
19.084999999999994 µg/L
No EPA limit set
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2019
1/2 SYR4
Trichloroacetic Acid
12.91 µg/L
No EPA limit set
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2019
1/2 SYR4
Lead
7.884999999999994 µg/L 53%
of the EPA limit 15 µg/L
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2018
2/2 SYR4
Monobromoacetic Acid
6.952999999999996 µg/L
No EPA limit set
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2019
Highest in the city: 7.4 µg/L — IL AMERICAN-HARDIN · 839 people · 2019
2/2 SYR4
Dibromoacetic Acid
5.745999999999998 µg/L
No EPA limit set
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2019
2/2 SYR4
Monochloroacetic Acid
4.316 µg/L
No EPA limit set
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2019
Highest in the city: 5 µg/L — IL AMERICAN-HARDIN · 839 people · 2019
2/2 SYR4
Bromoform
3.626999999999999 µg/L
No EPA limit set
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2019
1/2 SYR4
Arsenic
2.5 µg/L 25%
of the EPA limit 10 µg/L
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2018
1/2 SYR4
Combined Radium (-226 And -228)
0.6120 pCi/L 12%
of the EPA limit 5 pCi/L
Main supplier: CALHOUN COUNTY RWD · 4,675 people · 2016
2/2 SYR4
Lead
0.0045 mg/L 30%
of the EPA limit 0.0150 mg/L
Main supplier: CALHOUN COUNTY RWD · 4,675 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 Hardin

SupplierPopulation served
CALHOUN COUNTY RWD 4,675
IL AMERICAN-HARDIN 839

Frequently asked questions about Hardin tap water

Is Hardin tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Hardin. 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 Hardin?

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

What contaminants are in Hardin's water?

The contaminants EPA monitoring detected in Hardin include Copper, Fluoride, Nitrate, Barium, Nitrate-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.