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Tap water quality report

Wilmette, IL

EPA monitoring detected 18 contaminants across the 1 water supplier serving Wilmette. 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
27,087
people served
18
contaminants found
Illinois rankings Lead in Illinois PFAS in Illinois

What was found in Wilmette'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
1046 µg/L 26%
of the EPA limit 4000 µg/L
Main supplier: WILMETTE · 27,087 people · 2019
1/1 SYR4
Nitrate
760 µg/L 7.6%
of the EPA limit 10000 µg/L
Main supplier: WILMETTE · 27,087 people · 2019
1/1 SYR4
Nitrate-Nitrite
742 µg/L 7.4%
of the EPA limit 10000 µg/L
Main supplier: WILMETTE · 27,087 people · 2018
1/1 SYR4
Copper
189.6 µg/L 15%
of the EPA limit 1300 µg/L
Main supplier: WILMETTE · 27,087 people · 2017
1/1 SYR4
TTHM
30.88 µg/L 39%
of the EPA limit 80 µg/L
Main supplier: WILMETTE · 27,087 people · 2019
1/1 SYR4
Barium
23 µg/L 1.2%
of the EPA limit 2000 µg/L
Main supplier: WILMETTE · 27,087 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
19.88 µg/L 33%
of the EPA limit 60 µg/L
Main supplier: WILMETTE · 27,087 people · 2019
1/1 SYR4
Chloroform
16.905 µg/L
No EPA limit set
Main supplier: WILMETTE · 27,087 people · 2019
1/1 SYR4
Dichloroacetic Acid
11.845 µg/L
No EPA limit set
Main supplier: WILMETTE · 27,087 people · 2019
1/1 SYR4
Bromodichloromethane
9.975 µg/L
No EPA limit set
Main supplier: WILMETTE · 27,087 people · 2019
1/1 SYR4
Lead
8.155 µg/L 54%
of the EPA limit 15 µg/L
Main supplier: WILMETTE · 27,087 people · 2017
1/1 SYR4
Trichloroacetic Acid
7.51 µg/L
No EPA limit set
Main supplier: WILMETTE · 27,087 people · 2019
1/1 SYR4
Monobromoacetic Acid
6.228 µg/L
No EPA limit set
Main supplier: WILMETTE · 27,087 people · 2019
1/1 SYR4
Dibromochloromethane
6.085 µg/L
No EPA limit set
Main supplier: WILMETTE · 27,087 people · 2019
1/1 SYR4
Dibromoacetic Acid
1.7505 µg/L
No EPA limit set
Main supplier: WILMETTE · 27,087 people · 2019
1/1 SYR4
Bromoform
1.6002 µg/L
No EPA limit set
Main supplier: WILMETTE · 27,087 people · 2019
1/1 SYR4
Arsenic
1 µg/L 10%
of the EPA limit 10 µg/L
Main supplier: WILMETTE · 27,087 people · 2019
1/1 SYR4
Lead
0.0099 mg/L 66%
of the EPA limit 0.0150 mg/L
Main supplier: WILMETTE · 27,087 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 Wilmette

SupplierPopulation served
WILMETTE 27,087

Frequently asked questions about Wilmette tap water

Is Wilmette tap water safe to drink?

EPA testing detected 18 contaminants in the water serving Wilmette. 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 Wilmette?

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

What contaminants are in Wilmette's water?

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