Is Grayslake Tap Water Safe? Quality Report

Water source: SWP
Ownership: Local government
Counties served: Lake

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	Archived	2000-09-01 → 2000-09-30
MCL	Health-based	Archived	2000-09-01 → 2000-09-30
MCL	Health-based	Archived	1999-08-01 → 1999-08-31
MCL	Health-based	Archived	1999-08-01 → 1999-08-31
TT	Health-based	Resolved	1994-01-01
TT	Health-based	Resolved	1994-01-01
TT	Health-based	Resolved	1992-12-21
TT	Health-based	Resolved	1992-12-21
MCL	Health-based	Archived	1992-10-01 → 1992-10-31
MCL	Health-based	Archived	1992-10-01 → 1992-10-31

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Bromodichloromethane	10.9 µg/L No EPA limit set	67/67	SYR4	2012–2019
Chloroform	31.3 µg/L No EPA limit set	67/67	SYR4	2012–2019
Dibromochloromethane	7.837 µg/L No EPA limit set	67/67	SYR4	2012–2019
TTHM	50.3 µg/L 63% of the EPA limit 80 µg/L	67/67	SYR4	2012–2019
Bromoform	3.626 µg/L No EPA limit set	58/67	SYR4	2012–2019
Lead	24.7 µg/L 165% of the EPA limit, in the worst sample — 15 µg/L	53/90	SYR4	2013–2019
Total Haloacetic Acids (HAA5)	13.9 µg/L 23% of the EPA limit 60 µg/L	52/67	SYR4	2012–2019
Dibromoacetic Acid	2.5 µg/L No EPA limit set	35/67	SYR4	2012–2019
Copper	520 µg/L 40% of the EPA limit 1300 µg/L	28/90	SYR4	2013–2019
Trichloroacetic Acid	6.89 µg/L No EPA limit set	28/67	SYR4	2012–2019
Lead	0.0120 mg/L 80% of the EPA limit 0.0150 mg/L	19/19	LCR	2025
Dichloroacetic Acid	11.4 µg/L No EPA limit set	16/67	SYR4	2012–2019
Monobromoacetic Acid	2.14 µg/L No EPA limit set	6/67	SYR4	2012–2019

31 contaminants tested, none detected

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Utility contact

Contact: RIGGS, PETER A.
Phone: 847-223-8515
Email: PRIGGS@VILLAGEOFGRAYSLAKE.COM

Frequently asked questions about Grayslake

Is Grayslake tap water safe to drink?

EPA monitoring detected 13 contaminants in Grayslake'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 Grayslake's water?

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

How many people does Grayslake serve?

Grayslake reports serving 21,248 people in Illinois, per its EPA record.

Has Grayslake had any water quality violations?

The EPA has 21 violations on file for Grayslake, of which 13 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.