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Tap water quality report

West Chicago, IL

EPA monitoring detected 19 contaminants across the 1 water supplier serving West Chicago. 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
25,166
people served
19
contaminants found
Illinois rankings Lead in Illinois PFAS in Illinois

What was found in West Chicago'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
Fluoride
1085.9 µg/L 27%
of the EPA limit 4000 µg/L
Main supplier: WEST CHICAGO · 25,166 people · 2018
1/1 SYR4
Copper
260.6 µg/L 20%
of the EPA limit 1300 µg/L
Main supplier: WEST CHICAGO · 25,166 people · 2018
1/1 SYR4
Nitrate
129 µg/L 1.3%
of the EPA limit 10000 µg/L
Main supplier: WEST CHICAGO · 25,166 people · 2019
1/1 SYR4
Nitrate-Nitrite
124.65 µg/L 1.2%
of the EPA limit 10000 µg/L
Main supplier: WEST CHICAGO · 25,166 people · 2016
1/1 SYR4
Barium
78.77 µg/L 3.9%
of the EPA limit 2000 µg/L
Main supplier: WEST CHICAGO · 25,166 people · 2018
1/1 SYR4
Lithium
36.8 µg/L
No EPA limit set
Main supplier: WEST CHICAGO · 25,166 people · 2024
1/1 UCMR-5
TTHM
30.188 µg/L 38%
of the EPA limit 80 µg/L
Main supplier: WEST CHICAGO · 25,166 people · 2019
1/1 SYR4
Lead
18.175 µg/L 121%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: WEST CHICAGO · 25,166 people · 2018
1/1 SYR4
Chloroform
9.5725 µg/L
No EPA limit set
Main supplier: WEST CHICAGO · 25,166 people · 2019
1/1 SYR4
Dibromochloromethane
9.3 µg/L
No EPA limit set
Main supplier: WEST CHICAGO · 25,166 people · 2019
1/1 SYR4
Bromodichloromethane
9.249 µg/L
No EPA limit set
Main supplier: WEST CHICAGO · 25,166 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
7.384 µg/L 12%
of the EPA limit 60 µg/L
Main supplier: WEST CHICAGO · 25,166 people · 2019
1/1 SYR4
Dichloroacetic Acid
5.212 µg/L
No EPA limit set
Main supplier: WEST CHICAGO · 25,166 people · 2019
1/1 SYR4
Bromoform
3.8085 µg/L
No EPA limit set
Main supplier: WEST CHICAGO · 25,166 people · 2019
1/1 SYR4
Dibromoacetic Acid
2.806 µg/L
No EPA limit set
Main supplier: WEST CHICAGO · 25,166 people · 2019
1/1 SYR4
Monobromoacetic Acid
2.69 µg/L
No EPA limit set
Main supplier: WEST CHICAGO · 25,166 people · 2019
1/1 SYR4
Combined Radium (-226 And -228)
2.57 pCi/L 51%
of the EPA limit 5 pCi/L
Main supplier: WEST CHICAGO · 25,166 people · 2018
1/1 SYR4
Trichloroacetic Acid
1.701 µg/L
No EPA limit set
Main supplier: WEST CHICAGO · 25,166 people · 2019
1/1 SYR4
Lead
0.00093 mg/L 6.2%
of the EPA limit 0.0150 mg/L
Main supplier: WEST CHICAGO · 25,166 people · 2025
1/1 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 West Chicago

SupplierPopulation served
WEST CHICAGO 25,166

Frequently asked questions about West Chicago tap water

Is West Chicago tap water safe to drink?

EPA testing detected 19 contaminants in the water serving West Chicago. 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 West Chicago?

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

What contaminants are in West Chicago's water?

The contaminants EPA monitoring detected in West Chicago include Fluoride, Copper, 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.