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Tap water quality report

Williamsville, IL

EPA monitoring detected 12 contaminants across the 1 water supplier serving Williamsville. 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
6,198
people served
12
contaminants found
Illinois rankings Lead in Illinois PFAS in Illinois

What was found in Williamsville'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
TTHM
57.54 µg/L 72%
of the EPA limit 80 µg/L
Main supplier: WILLIAMSVILLE · 6,198 people · 2019
1/1 SYR4
Chloroform
45.03 µg/L
No EPA limit set
Main supplier: WILLIAMSVILLE · 6,198 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
28.739999999999995 µg/L 48%
of the EPA limit 60 µg/L
Main supplier: WILLIAMSVILLE · 6,198 people · 2019
1/1 SYR4
Dichloroacetic Acid
23.119999999999997 µg/L
No EPA limit set
Main supplier: WILLIAMSVILLE · 6,198 people · 2019
1/1 SYR4
Lead
14.0755 µg/L 94%
of the EPA limit 15 µg/L
Main supplier: WILLIAMSVILLE · 6,198 people · 2019
1/1 SYR4
Bromodichloromethane
11.49 µg/L
No EPA limit set
Main supplier: WILLIAMSVILLE · 6,198 people · 2019
1/1 SYR4
Trichloroacetic Acid
5.569999999999999 µg/L
No EPA limit set
Main supplier: WILLIAMSVILLE · 6,198 people · 2019
1/1 SYR4
Dibromochloromethane
4.684999999999999 µg/L
No EPA limit set
Main supplier: WILLIAMSVILLE · 6,198 people · 2019
1/1 SYR4
Monochloroacetic Acid
2 µg/L
No EPA limit set
Main supplier: WILLIAMSVILLE · 6,198 people · 2019
1/1 SYR4
Dibromoacetic Acid
1.9999999999999978 µg/L
No EPA limit set
Main supplier: WILLIAMSVILLE · 6,198 people · 2019
1/1 SYR4
Bromoform
1.3 µg/L
No EPA limit set
Main supplier: WILLIAMSVILLE · 6,198 people · 2019
1/1 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: WILLIAMSVILLE · 6,198 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 Williamsville

SupplierPopulation served
WILLIAMSVILLE 6,198

Frequently asked questions about Williamsville tap water

Is Williamsville tap water safe to drink?

EPA testing detected 12 contaminants in the water serving Williamsville. 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 Williamsville?

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

What contaminants are in Williamsville's water?

The contaminants EPA monitoring detected in Williamsville include TTHM, Chloroform, Total Haloacetic Acids (HAA5), Dichloroacetic Acid, Lead. 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.