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Lake Zurich, IL

EPA monitoring detected 24 contaminants across the 1 water supplier serving Lake Zurich. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

1
water supplier
19,759
people served
24
contaminants found
Illinois rankings Lead in Illinois PFAS in Illinois

What was found in Lake Zurich's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Barium
3400 µg/L 170%
of the EPA limit, in the worst sample — 2000 µg/L
 1/1 SYR4
Fluoride
1140 µg/L 28%
of the EPA limit 4000 µg/L
 1/1 SYR4
Copper
440 µg/L 34%
of the EPA limit 1300 µg/L
 1/1 SYR4
Lead
356 µg/L 2373%
of the EPA limit, in the worst sample — 15 µg/L
 1/1 SYR4
Nitrate
122 µg/L 1.2%
of the EPA limit 10000 µg/L
 1/1 SYR4
Nitrate-Nitrite
122 µg/L 1.2%
of the EPA limit 10000 µg/L
 1/1 SYR4
Chloroform
51 µg/L
No EPA limit set
 1/1 SYR4
TTHM
51 µg/L 64%
of the EPA limit 80 µg/L
 1/1 SYR4
Lithium
26 µg/L
No EPA limit set
 1/1 UCMR-5
Nitrite
24 µg/L 2.4%
of the EPA limit 1000 µg/L
 1/1 SYR4
Total Haloacetic Acids (HAA5)
16.7 µg/L 28%
of the EPA limit 60 µg/L
 1/1 SYR4
Dichloroacetic Acid
11.2 µg/L
No EPA limit set
 1/1 SYR4
Combined Radium (-226 And -228)
7.8 pCi/L 156%
of the EPA limit, in the worst sample — 5 pCi/L
 1/1 SYR4
Bromodichloromethane
6.28 µg/L
No EPA limit set
 1/1 SYR4
Trichloroacetic Acid
4.6 µg/L
No EPA limit set
 1/1 SYR4
Dibromochloromethane
3.17 µg/L
No EPA limit set
 1/1 SYR4
Selenium
3.14 µg/L 6.3%
of the EPA limit 50 µg/L
 1/1 SYR4
Di(2-ethylhexyl) Phthalate
2.45 µg/L 41%
of the EPA limit 6 µg/L
 1/1 SYR4
Monochloroacetic Acid
2.02 µg/L
No EPA limit set
 1/1 SYR4
Bromoform
1.13 µg/L
No EPA limit set
 1/1 SYR4
Dibromoacetic Acid
0.8820 µg/L
No EPA limit set
 1/1 SYR4
Lead
0.0069 mg/L 46%
of the EPA limit 0.0150 mg/L
 1/1 LCR
Pfhxa
0.0035 µg/L
No EPA limit set
 1/1 UCMR-5
Pfpea
0.0035 µg/L
No EPA limit set
 1/1 UCMR-5
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. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Lake Zurich

SupplierPopulation served
LAKE ZURICH 19,759

Frequently asked questions about Lake Zurich tap water

Is Lake Zurich tap water safe to drink?

EPA testing detected 24 contaminants in the water serving Lake Zurich. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Lake Zurich?

1 public water supplier report drinking-water monitoring for Lake Zurich, Illinois to the EPA. Each is listed above with its population served.

What contaminants are in Lake Zurich's water?

The contaminants EPA monitoring detected in Lake Zurich include Barium, Fluoride, Copper, Lead, Nitrate. The full list, with the highest level found and the data source, is in the table above.

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.