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Tap water quality report

Woodstock

EPA monitoring tested this supplier for 108 contaminants and detected 21. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

108
contaminants tested
21
detected
25,630
people served
10
health-based violations
Illinois rankingsLead in IllinoisPFAS in Illinois
Water source
Ground water
Ownership
Local government
Counties served
McHenry

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

10
health-based violations
26
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2024-04-02
TT Health-based Resolved 2024-04-02
TT Health-based Resolved 2024-04-02
TT Health-based Resolved 2024-04-02
MCL Health-based Archived 1996-08-01 → 1996-08-31
MCL Health-based Archived 1996-08-01 → 1996-08-31
MCL Health-based Archived 1996-08-01 → 1996-08-31
MCL Health-based Archived 1992-12-01 → 1992-12-31
MCL Health-based Archived 1992-12-01 → 1992-12-31
MCL Health-based Archived 1992-12-01 → 1992-12-31

Other contaminants detected

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 this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Copper
1341.5 µg/L 103%
of the EPA limit, at the 95th percentile of samples — 1300 µg/L
worst single sample: 1530 µg/L
54/60 SYR4 2014–2017
Nitrate
1399 µg/L 14%
of the EPA limit 10000 µg/L
worst single sample: 1520 µg/L
32/32 SYR4 2012–2019
Bromodichloromethane
11.965 µg/L
No EPA limit set
worst single sample: 12.3 µg/L
28/28 SYR4 2012–2019
Chloroform
24.0985 µg/L
No EPA limit set
worst single sample: 27.2 µg/L
28/28 SYR4 2012–2019
Dibromochloromethane
5.65825 µg/L
No EPA limit set
worst single sample: 6.35 µg/L
28/28 SYR4 2012–2019
TTHM
39.585 µg/L 49%
of the EPA limit 80 µg/L
worst single sample: 43.7 µg/L
28/28 SYR4 2012–2019
Lead
10.86 µg/L 72%
of the EPA limit 15 µg/L
worst single sample: 60 µg/L
25/60 SYR4 2014–2017
Total Haloacetic Acids (HAA5)
22.265 µg/L 37%
of the EPA limit 60 µg/L
worst single sample: 23 µg/L
24/28 SYR4 2012–2019
Trichloroacetic Acid
11.34 µg/L
No EPA limit set
worst single sample: 12 µg/L
24/28 SYR4 2012–2019
Lead
0.0070 mg/L 47%
of the EPA limit 0.0150 mg/L
 20/20 LCR 2025
Dichloroacetic Acid
9.27 µg/L
No EPA limit set
worst single sample: 9.9 µg/L
19/28 SYR4 2012–2019
Dibromoacetic Acid
1.52 µg/L
No EPA limit set
worst single sample: 1.7 µg/L
13/28 SYR4 2012–2019
Barium
81.5 µg/L 4.1%
of the EPA limit 2000 µg/L
worst single sample: 82 µg/L
6/6 SYR4 2012–2018
Fluoride
1062.5 µg/L 27%
of the EPA limit 4000 µg/L
worst single sample: 1080 µg/L
6/6 SYR4 2012–2018
Nitrate-Nitrite
1261 µg/L 13%
of the EPA limit 10000 µg/L
worst single sample: 1280 µg/L
2/2 SYR4 2013
Arsenic
1.2 µg/L 12%
of the EPA limit 10 µg/L
 1/6 SYR4 2012–2018
Bromoform
0.7530 µg/L
No EPA limit set
 1/28 SYR4 2012–2019
Chromium
6.5 µg/L 6.5%
of the EPA limit 100 µg/L
 1/6 SYR4 2012–2018
Combined Radium (-226 And -228)
0.6690 pCi/L 13%
of the EPA limit 5 pCi/L
 1/2 SYR4 2014
Monobromoacetic Acid
1.44 µg/L
No EPA limit set
 1/28 SYR4 2012–2019
Selenium
6.6 µg/L 13%
of the EPA limit 50 µg/L
 1/6 SYR4 2012–2018
87 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
AYMOND, BRENT
Phone
815-338-6118
Email
[email protected]

Frequently asked questions about Woodstock

Is Woodstock tap water safe to drink?

EPA monitoring detected 21 contaminants in Woodstock's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Woodstock's water?

EPA monitoring detected Copper, Nitrate, Bromodichloromethane, Chloroform, Dibromochloromethane, and others. The full list with the level and data source for each is above.

How many people does Woodstock serve?

Woodstock reports serving 25,630 people in Illinois, per its EPA record.

Has Woodstock had any water quality violations?

The EPA has 26 violations on file for Woodstock, of which 10 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

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.