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Tap water quality report

Woodstock, IL

EPA monitoring detected 21 contaminants across the 1 water supplier serving Woodstock. 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
25,630
people served
21
contaminants found
Illinois rankings Lead in Illinois PFAS in Illinois

What was found in Woodstock'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
Nitrate
1399 µg/L 14%
of the EPA limit 10000 µg/L
Main supplier: WOODSTOCK · 25,630 people · 2019
1/1 SYR4
Copper
1341.5 µg/L 103%
of the EPA limit, at the 95th percentile of samples — 1300 µg/L
Main supplier: WOODSTOCK · 25,630 people · 2017
1/1 SYR4
Nitrate-Nitrite
1261 µg/L 13%
of the EPA limit 10000 µg/L
Main supplier: WOODSTOCK · 25,630 people · 2013
1/1 SYR4
Fluoride
1062.5 µg/L 27%
of the EPA limit 4000 µg/L
Main supplier: WOODSTOCK · 25,630 people · 2018
1/1 SYR4
Barium
81.5 µg/L 4.1%
of the EPA limit 2000 µg/L
Main supplier: WOODSTOCK · 25,630 people · 2018
1/1 SYR4
TTHM
39.585 µg/L 49%
of the EPA limit 80 µg/L
Main supplier: WOODSTOCK · 25,630 people · 2019
1/1 SYR4
Chloroform
24.0985 µg/L
No EPA limit set
Main supplier: WOODSTOCK · 25,630 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
22.265 µg/L 37%
of the EPA limit 60 µg/L
Main supplier: WOODSTOCK · 25,630 people · 2019
1/1 SYR4
Bromodichloromethane
11.965 µg/L
No EPA limit set
Main supplier: WOODSTOCK · 25,630 people · 2019
1/1 SYR4
Trichloroacetic Acid
11.34 µg/L
No EPA limit set
Main supplier: WOODSTOCK · 25,630 people · 2019
1/1 SYR4
Lead
10.86 µg/L 72%
of the EPA limit 15 µg/L
Main supplier: WOODSTOCK · 25,630 people · 2017
1/1 SYR4
Dichloroacetic Acid
9.27 µg/L
No EPA limit set
Main supplier: WOODSTOCK · 25,630 people · 2019
1/1 SYR4
Selenium
6.6 µg/L 13%
of the EPA limit 50 µg/L
Main supplier: WOODSTOCK · 25,630 people · 2018
1/1 SYR4
Chromium
6.5 µg/L 6.5%
of the EPA limit 100 µg/L
Main supplier: WOODSTOCK · 25,630 people · 2018
1/1 SYR4
Dibromochloromethane
5.65825 µg/L
No EPA limit set
Main supplier: WOODSTOCK · 25,630 people · 2019
1/1 SYR4
Dibromoacetic Acid
1.52 µg/L
No EPA limit set
Main supplier: WOODSTOCK · 25,630 people · 2019
1/1 SYR4
Monobromoacetic Acid
1.44 µg/L
No EPA limit set
Main supplier: WOODSTOCK · 25,630 people · 2019
1/1 SYR4
Arsenic
1.2 µg/L 12%
of the EPA limit 10 µg/L
Main supplier: WOODSTOCK · 25,630 people · 2018
1/1 SYR4
Bromoform
0.7530 µg/L
No EPA limit set
Main supplier: WOODSTOCK · 25,630 people · 2019
1/1 SYR4
Combined Radium (-226 And -228)
0.6690 pCi/L 13%
of the EPA limit 5 pCi/L
Main supplier: WOODSTOCK · 25,630 people · 2014
1/1 SYR4
Lead
0.0070 mg/L 47%
of the EPA limit 0.0150 mg/L
Main supplier: WOODSTOCK · 25,630 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 Woodstock

SupplierPopulation served
WOODSTOCK 25,630

Frequently asked questions about Woodstock tap water

Is Woodstock tap water safe to drink?

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

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

What contaminants are in Woodstock's water?

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