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Tap water quality report

Mchenry, IL

EPA monitoring detected 21 contaminants across the 1 water supplier serving Mchenry. 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.

1
water supplier
22,335
people served
21
contaminants found
Illinois rankings Lead in Illinois PFAS in Illinois

What was found in Mchenry'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
1760 µg/L 135%
of the EPA limit, at the 95th percentile of samples — 1300 µg/L
Main supplier: MCHENRY · 22,335 people · 2017
1/1 SYR4
Fluoride
1214 µg/L 30%
of the EPA limit 4000 µg/L
Main supplier: MCHENRY · 22,335 people · 2018
1/1 SYR4
Nitrate
640 µg/L 6.4%
of the EPA limit 10000 µg/L
Main supplier: MCHENRY · 22,335 people · 2019
1/1 SYR4
Nitrate-Nitrite
629.5 µg/L 6.3%
of the EPA limit 10000 µg/L
Main supplier: MCHENRY · 22,335 people · 2018
1/1 SYR4
Barium
150 µg/L 7.5%
of the EPA limit 2000 µg/L
Main supplier: MCHENRY · 22,335 people · 2018
1/1 SYR4
TTHM
40.63 µg/L 51%
of the EPA limit 80 µg/L
Main supplier: MCHENRY · 22,335 people · 2019
1/1 SYR4
Lead
36 µg/L 240%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: MCHENRY · 22,335 people · 2017
1/1 SYR4
Bromodichloromethane
12.78 µg/L
No EPA limit set
Main supplier: MCHENRY · 22,335 people · 2019
1/1 SYR4
Chloroform
12.39 µg/L
No EPA limit set
Main supplier: MCHENRY · 22,335 people · 2019
1/1 SYR4
Dibromochloromethane
12.1015 µg/L
No EPA limit set
Main supplier: MCHENRY · 22,335 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
11.771 µg/L 20%
of the EPA limit 60 µg/L
Main supplier: MCHENRY · 22,335 people · 2019
1/1 SYR4
Lithium
9.09 µg/L
No EPA limit set
Main supplier: MCHENRY · 22,335 people · 2023
1/1 UCMR-5
Trichloroacetic Acid
8.096 µg/L
No EPA limit set
Main supplier: MCHENRY · 22,335 people · 2019
1/1 SYR4
Dichloroacetic Acid
5.376 µg/L
No EPA limit set
Main supplier: MCHENRY · 22,335 people · 2019
1/1 SYR4
Chromium
5.2 µg/L 5.2%
of the EPA limit 100 µg/L
Main supplier: MCHENRY · 22,335 people · 2018
1/1 SYR4
Bromoform
4.0422 µg/L
No EPA limit set
Main supplier: MCHENRY · 22,335 people · 2019
1/1 SYR4
Dibromoacetic Acid
2.855 µg/L
No EPA limit set
Main supplier: MCHENRY · 22,335 people · 2019
1/1 SYR4
Arsenic
1.58 µg/L 16%
of the EPA limit 10 µg/L
Main supplier: MCHENRY · 22,335 people · 2018
1/1 SYR4
Combined Radium (-226 And -228)
1.2497 pCi/L 25%
of the EPA limit 5 pCi/L
Main supplier: MCHENRY · 22,335 people · 2018
1/1 SYR4
Lead
0.0041 mg/L 27%
of the EPA limit 0.0150 mg/L
Main supplier: MCHENRY · 22,335 people · 2026
1/1 LCR
PFBS
0.0039 µg/L
No EPA limit set
Main supplier: MCHENRY · 22,335 people · 2024
1/1 UCMR-5
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 Mchenry

SupplierPopulation served
MCHENRY 22,335

Frequently asked questions about Mchenry tap water

Is Mchenry tap water safe to drink?

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

1 public water supplier report drinking-water monitoring for Mchenry, Illinois to the EPA. Each is listed above with its population served.

What contaminants are in Mchenry's water?

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