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Tap water quality report

Lake Zurich

EPA monitoring tested this supplier for 109 contaminants and detected 24. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

109
contaminants tested
24
detected
19,759
people served
236
health-based violations
Illinois rankingsLead in IllinoisPFAS in Illinois
Water source
Ground water
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.

236
health-based violations
245
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2009-04-01 → 2009-06-30
MCL Health-based Resolved 2009-04-01 → 2009-06-30
MCL Health-based Resolved 2009-04-01 → 2009-06-30
MCL Health-based Resolved 2009-04-01 → 2009-06-30
MCL Health-based Resolved 2009-01-01 → 2009-03-31
MCL Health-based Resolved 2009-01-01 → 2009-03-31
MCL Health-based Resolved 2009-01-01 → 2009-03-31
MCL Health-based Resolved 2009-01-01 → 2009-03-31
MCL Health-based Resolved 2008-10-01 → 2008-12-31
MCL Health-based Resolved 2008-10-01 → 2008-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
Pfhxa 0.0035 µg/L 1/10 2024
Pfpea 0.0035 µg/L 1/10 2024

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
Lead
356 µg/L 2373%
of the EPA limit, in the worst sample — 15 µg/L
 85/277 SYR4 2014–2019
Copper
440 µg/L 34%
of the EPA limit 1300 µg/L
 56/277 SYR4 2014–2019
Combined Radium (-226 And -228)
7.8 pCi/L 156%
of the EPA limit, in the worst sample — 5 pCi/L
 34/35 SYR4 2012–2019
Lead
0.0069 mg/L 46%
of the EPA limit 0.0150 mg/L
 23/23 LCR 2025
Barium
3400 µg/L 170%
of the EPA limit, in the worst sample — 2000 µg/L
 22/22 SYR4 2012–2019
TTHM
51 µg/L 64%
of the EPA limit 80 µg/L
 21/32 SYR4 2012–2019
Chloroform
51 µg/L
No EPA limit set
 20/32 SYR4 2012–2019
Fluoride
1140 µg/L 28%
of the EPA limit 4000 µg/L
 18/18 SYR4 2012–2018
Bromodichloromethane
6.28 µg/L
No EPA limit set
 16/32 SYR4 2012–2019
Dibromochloromethane
3.17 µg/L
No EPA limit set
 12/32 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
16.7 µg/L 28%
of the EPA limit 60 µg/L
 10/32 SYR4 2012–2019
Lithium
26 µg/L
No EPA limit set
 8/10 UCMR-5 2024
Dichloroacetic Acid
11.2 µg/L
No EPA limit set
 7/32 SYR4 2012–2019
Trichloroacetic Acid
4.6 µg/L
No EPA limit set
 7/32 SYR4 2012–2019
Nitrate-Nitrite
122 µg/L 1.2%
of the EPA limit 10000 µg/L
 6/24 SYR4 2012–2016
Dibromoacetic Acid
0.8820 µg/L
No EPA limit set
 3/32 SYR4 2012–2019
Bromoform
1.13 µg/L
No EPA limit set
 2/32 SYR4 2012–2019
Nitrate
122 µg/L 1.2%
of the EPA limit 10000 µg/L
 2/84 SYR4 2012–2019
Nitrite
24 µg/L 2.4%
of the EPA limit 1000 µg/L
 2/51 SYR4 2012–2018
Di(2-ethylhexyl) Phthalate
2.45 µg/L 41%
of the EPA limit 6 µg/L
 1/10 SYR4 2012–2018
Monochloroacetic Acid
2.02 µg/L
No EPA limit set
 1/32 SYR4 2012–2019
Selenium
3.14 µg/L 6.3%
of the EPA limit 50 µg/L
 1/18 SYR4 2012–2018
85 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, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
SCHMITT, STEVEN
Phone
847-540-1696
Email
steve.schmitt@lakezurich.org

Frequently asked questions about Lake Zurich

Is Lake Zurich tap water safe to drink?

EPA monitoring detected 24 contaminants in Lake Zurich'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 Zurich's water?

EPA monitoring detected Lead, Copper, Combined Radium (-226 And -228), Lead, Barium, and others. The full list with the level and data source for each is above.

How many people does Lake Zurich serve?

Lake Zurich reports serving 19,759 people in Illinois, per its EPA record.

Has Lake Zurich had any water quality violations?

The EPA has 245 violations on file for Lake Zurich, of which 236 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.