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Tap water quality report

Wonder Lake (Niu)

EPA monitoring tested this supplier for 50 contaminants and detected 11. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

50
contaminants tested
11
detected
1,950
people served
18
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.

18
health-based violations
394
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2013-07-01 → 2013-09-30
MCL Health-based Resolved 2013-07-01 → 2013-09-30
MCL Health-based Resolved 2013-07-01 → 2013-09-30
MCL Health-based Resolved 2013-07-01 → 2013-09-30
MCL Health-based Resolved 2013-07-01 → 2013-09-30
MCL Health-based Resolved 2013-07-01 → 2013-09-30
MCL Health-based Resolved 2013-04-01 → 2013-06-30
MCL Health-based Resolved 2013-04-01 → 2013-06-30
MCL Health-based Resolved 2013-04-01 → 2013-06-30
MCL Health-based Resolved 2013-04-01 → 2013-06-30

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
Arsenic
11 µg/L 110%
of the EPA limit, in the worst sample — 10 µg/L
 33/33 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2023
Copper
14 µg/L 1.1%
of the EPA limit 1300 µg/L
 10/20 SYR4 2014–2017
Chloroform
2.82 µg/L
No EPA limit set
 7/8 SYR4 2013–2019
TTHM
2.82 µg/L 3.5%
of the EPA limit 80 µg/L
 7/8 SYR4 2013–2019
Dichloroacetic Acid
8.6 µg/L
No EPA limit set
 5/8 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
11 µg/L 18%
of the EPA limit 60 µg/L
 5/8 SYR4 2013–2019
Barium
69 µg/L 3.5%
of the EPA limit 2000 µg/L
 3/3 SYR4 2012–2018
Fluoride
1270 µg/L 32%
of the EPA limit 4000 µg/L
 3/3 SYR4 2012–2018
Lead
3.2 µg/L 21%
of the EPA limit 15 µg/L
 2/20 SYR4 2014–2017
Trichloroacetic Acid
2.41 µg/L
No EPA limit set
 1/8 SYR4 2013–2019
39 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalBenzeneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCyanideCadmiumCarbon TetrachlorideChromiumCombined Radium (-226 And -228)DichloromethaneDibromoacetic AcidDibromochloromethaneEthylbenzeneMercuryMonobromoacetic AcidMonochloroacetic AcidNitrateNitrate-NitriteNitriteSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

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

Frequently asked questions about Wonder Lake (Niu)

Is Wonder Lake (Niu) tap water safe to drink?

EPA monitoring detected 11 contaminants in Wonder Lake (Niu)'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 (Niu)'s water?

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

How many people does Wonder Lake (Niu) serve?

Wonder Lake (Niu) reports serving 1,950 people in Illinois, per its EPA record.

Has Wonder Lake (Niu) had any water quality violations?

The EPA has 394 violations on file for Wonder Lake (Niu), of which 18 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.