Is Lake in the Hills Tap Water Safe? Quality Report

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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2012-08-01 → 2012-08-31
MCL	Health-based	Resolved	2012-08-01 → 2012-08-31
MCL	Health-based	Resolved	2012-08-01 → 2012-08-31
MCL	Health-based	Resolved	2012-08-01 → 2012-08-31
MCL	Health-based	Resolved	2005-06-01 → 2005-06-30
MCL	Health-based	Resolved	2005-06-01 → 2005-06-30
MCL	Health-based	Resolved	2005-06-01 → 2005-06-30
MCL	Health-based	Resolved	2005-06-01 → 2005-06-30
MCL	Health-based	Archived	1997-07-01 → 1997-07-31
MCL	Health-based	Archived	1997-07-01 → 1997-07-31

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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Copper	1505 µg/L 116% of the EPA limit, at the 95th percentile of samples — 1300 µg/L worst single sample: 2080 µg/L	51/60	SYR4	2014–2017
Bromodichloromethane	10.4035 µg/L No EPA limit set worst single sample: 12.33 µg/L	28/28	SYR4	2012–2019
Chloroform	25.762 µg/L No EPA limit set worst single sample: 26.76 µg/L	28/28	SYR4	2012–2019
TTHM	38.3115 µg/L 48% of the EPA limit 80 µg/L worst single sample: 43.87 µg/L	28/28	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	26.5 µg/L 44% of the EPA limit 60 µg/L worst single sample: 28.3 µg/L	28/28	SYR4	2012–2019
Dibromochloromethane	7.9464 µg/L No EPA limit set worst single sample: 8.898 µg/L	27/28	SYR4	2012–2019
Trichloroacetic Acid	13.01 µg/L No EPA limit set worst single sample: 13.9 µg/L	27/28	SYR4	2012–2019
Barium	1380 µg/L 69% of the EPA limit 2000 µg/L worst single sample: 2180 µg/L	23/24	SYR4	2012–2019
Fluoride	1086 µg/L 27% of the EPA limit 4000 µg/L worst single sample: 1320 µg/L	23/23	SYR4	2012–2018
Lead	0.0027 mg/L 18% of the EPA limit 0.0150 mg/L	23/23	LCR	2025
Dichloroacetic Acid	13.07 µg/L No EPA limit set worst single sample: 14.4 µg/L	15/28	SYR4	2012–2019
Bromoform	1.935 µg/L No EPA limit set worst single sample: 2.037 µg/L	13/28	SYR4	2012–2019
Combined Radium (-226 And -228)	3.0415 pCi/L 61% of the EPA limit 5 pCi/L worst single sample: 3.19 pCi/L	12/19	SYR4	2012–2019
Dibromoacetic Acid	3.17 µg/L No EPA limit set worst single sample: 3.5 µg/L	12/28	SYR4	2012–2019
Lithium	10.8 µg/L No EPA limit set	4/16	UCMR-5	2025
Arsenic	1.56 µg/L 16% of the EPA limit 10 µg/L worst single sample: 1.6 µg/L	3/23	SYR4	2012–2018
Lead	4.19 µg/L 28% of the EPA limit 15 µg/L worst single sample: 4.2 µg/L	3/60	SYR4	2014–2017
Cadmium	1 µg/L 20% of the EPA limit 5 µg/L	1/23	SYR4	2012–2018
Chromium	5.2 µg/L 5.2% of the EPA limit 100 µg/L	1/23	SYR4	2012–2018

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, TotalChlorobenzeneCyanideCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitrateNitrate-NitriteNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: RIVERA, KEVIN
Phone: 847-960-7520
Email: [email protected]

Frequently asked questions about Lake in the Hills

Is Lake in the Hills tap water safe to drink?

EPA monitoring detected 19 contaminants in Lake in the Hills'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 Lake in the Hills's water?

EPA monitoring detected Copper, Bromodichloromethane, Chloroform, TTHM, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Lake in the Hills serve?

Lake in the Hills reports serving 28,661 people in Illinois, per its EPA record.

Has Lake in the Hills had any water quality violations?

The EPA has 44 violations on file for Lake in the Hills, 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.