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Tap water quality report

Wonder Lake

EPA monitoring tested this supplier for 109 contaminants and detected 20. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

109
contaminants tested
20
detected
3,870
people served
5
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.

5
health-based violations
393
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2023-04-02
TT Health-based Resolved 2023-04-02
TT Health-based Resolved 2023-04-02
MCL Health-based Archived 2001-01-01 → 2001-01-31
MCL Health-based Archived 2001-01-01 → 2001-01-31
MR Monitoring Resolved 2025-07-01
MR Monitoring Resolved 2025-07-01
MR Monitoring Resolved 2025-07-01
MR Monitoring Resolved 2025-04-01
MR Monitoring Resolved 2025-04-01

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Copper
2520 µg/L 194%
of the EPA limit, in the worst sample — 1300 µg/L
 103/133 SYR4 2014–2019
Lead
31.8 µg/L 212%
of the EPA limit, in the worst sample — 15 µg/L
 34/133 SYR4 2014–2019
Lead
0.0018 mg/L 12%
of the EPA limit 0.0150 mg/L
 25/25 LCR 2026
Barium
81 µg/L 4.1%
of the EPA limit 2000 µg/L
 18/18 SYR4 2012–2019
Arsenic
8.4 µg/L 84%
of the EPA limit 10 µg/L
 15/18 SYR4 2012–2019
Fluoride
557 µg/L 14%
of the EPA limit 4000 µg/L
 13/18 SYR4 2012–2019
Nitrate
390 µg/L 3.9%
of the EPA limit 10000 µg/L
 12/52 SYR4 2012–2019
Chloroform
19.5 µg/L
No EPA limit set
 10/10 SYR4 2014–2019
TTHM
39 µg/L 49%
of the EPA limit 80 µg/L
 10/10 SYR4 2014–2019
Total Haloacetic Acids (HAA5)
14.71 µg/L 25%
of the EPA limit 60 µg/L
 10/10 SYR4 2014–2019
Dichloroacetic Acid
9.43 µg/L
No EPA limit set
 9/10 SYR4 2014–2019
Combined Radium (-226 And -228)
1.42 pCi/L 28%
of the EPA limit 5 pCi/L
 6/12 SYR4 2014–2019
Nitrate-Nitrite
380 µg/L 3.8%
of the EPA limit 10000 µg/L
 4/16 SYR4 2015–2019
Trichloroacetic Acid
3.24 µg/L
No EPA limit set
 4/10 SYR4 2014–2019
Bromodichloromethane
12 µg/L
No EPA limit set
 2/10 SYR4 2014–2019
Bromoform
1.76 µg/L
No EPA limit set
 2/10 SYR4 2014–2019
Dibromoacetic Acid
4.5 µg/L
No EPA limit set
 2/10 SYR4 2014–2019
Dibromochloromethane
6.6 µg/L
No EPA limit set
 2/10 SYR4 2014–2019
Monobromoacetic Acid
4.31 µg/L
No EPA limit set
 1/10 SYR4 2014–2019
Selenium
2.3 µg/L 4.6%
of the EPA limit 50 µg/L
 1/18 SYR4 2012–2019
89 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 TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MANGUM, JAMES
Phone
815-277-9589
Email
jmangum@wlvillage.org

Frequently asked questions about Wonder Lake

Is Wonder Lake tap water safe to drink?

EPA monitoring detected 20 contaminants in Wonder Lake'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 Wonder Lake's water?

EPA monitoring detected Copper, Lead, Lead, Barium, Arsenic, and others. The full list with the level and data source for each is above.

How many people does Wonder Lake serve?

Wonder Lake reports serving 3,870 people in Illinois, per its EPA record.

Has Wonder Lake had any water quality violations?

The EPA has 393 violations on file for Wonder Lake, of which 5 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.