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Tap water quality report

Zion, IL

EPA monitoring detected 21 contaminants across the 3 water suppliers serving Zion. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

3
water suppliers
25,067
people served
21
contaminants found
Illinois rankings Lead in Illinois PFAS in Illinois

What was found in Zion's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Fluoride
1902 µg/L 48%
of the EPA limit 4000 µg/L
Highest in the city: LAKE COUNTY PUBLIC WATER DISTRICT · 1 people · 2019
1/3 SYR4
Nitrate
680 µg/L 6.8%
of the EPA limit 10000 µg/L
Highest in the city: LAKE COUNTY PUBLIC WATER DISTRICT · 1 people · 2019
1/3 SYR4
Nitrate-Nitrite
668 µg/L 6.7%
of the EPA limit 10000 µg/L
Highest in the city: LAKE COUNTY PUBLIC WATER DISTRICT · 1 people · 2018
1/3 SYR4
Copper
442 µg/L 34%
of the EPA limit 1300 µg/L
Main supplier: ZION · 24,442 people · 2017
2/3 SYR4
TTHM
58.55 µg/L 73%
of the EPA limit 80 µg/L
Main supplier: ZION · 24,442 people · 2019
3/3 SYR4
Lithium
43.3 µg/L
No EPA limit set
Main supplier: ZION · 24,442 people · 2025
1/3 UCMR-5
Chloroform
38.33 µg/L
No EPA limit set
Main supplier: ZION · 24,442 people · 2019
3/3 SYR4
Total Haloacetic Acids (HAA5)
25.79 µg/L 43%
of the EPA limit 60 µg/L
Main supplier: ZION · 24,442 people · 2019
3/3 SYR4
Barium
21 µg/L 1.1%
of the EPA limit 2000 µg/L
Highest in the city: LAKE COUNTY PUBLIC WATER DISTRICT · 1 people · 2019
1/3 SYR4
Bromodichloromethane
14.28 µg/L
No EPA limit set
Main supplier: ZION · 24,442 people · 2019
Highest in the city: 17.36 µg/L — BEACH MHP · 624 people · 2019
3/3 SYR4
Dichloroacetic Acid
14.555 µg/L
No EPA limit set
Main supplier: ZION · 24,442 people · 2019
3/3 SYR4
Trichloroacetic Acid
11.69 µg/L
No EPA limit set
Main supplier: ZION · 24,442 people · 2019
3/3 SYR4
Monobromoacetic Acid
9.476 µg/L
No EPA limit set
Highest in the city: LAKE COUNTY PUBLIC WATER DISTRICT · 1 people · 2019
1/3 SYR4
Lead
6.836 µg/L 46%
of the EPA limit 15 µg/L
Main supplier: ZION · 24,442 people · 2017
Highest in the city: 9.42 µg/L — BEACH MHP · 624 people · 2019
2/3 SYR4
Dibromochloromethane
6.47 µg/L
No EPA limit set
Main supplier: ZION · 24,442 people · 2019
Highest in the city: 8.295 µg/L — BEACH MHP · 624 people · 2019
3/3 SYR4
Monochloroacetic Acid
3.2 µg/L
No EPA limit set
Highest in the city: LAKE COUNTY PUBLIC WATER DISTRICT · 1 people · 2019
1/3 SYR4
Selenium
2.8 µg/L 5.6%
of the EPA limit 50 µg/L
Highest in the city: LAKE COUNTY PUBLIC WATER DISTRICT · 1 people · 2019
1/3 SYR4
Dibromoacetic Acid
1.6 µg/L
No EPA limit set
Main supplier: ZION · 24,442 people · 2019
Highest in the city: 1.935 µg/L — LAKE COUNTY PUBLIC WATER DISTRICT · 1 people · 2019
3/3 SYR4
Arsenic
1.1 µg/L 11%
of the EPA limit 10 µg/L
Highest in the city: LAKE COUNTY PUBLIC WATER DISTRICT · 1 people · 2019
1/3 SYR4
Bromoform
0.5030 µg/L
No EPA limit set
Highest in the city: LAKE COUNTY PUBLIC WATER DISTRICT · 1 people · 2019
1/3 SYR4
Lead
0.0091 mg/L 61%
of the EPA limit 0.0150 mg/L
Main supplier: ZION · 24,442 people · 2026
2/3 LCR
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 the system's samples — 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 Zion

SupplierPopulation served
ZION 24,442
BEACH MHP 624
LAKE COUNTY PUBLIC WATER DISTRICT 1

Frequently asked questions about Zion tap water

Is Zion tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Zion. 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 Zion?

3 public water suppliers report drinking-water monitoring for Zion, Illinois to the EPA. Each is listed above with its population served.

What contaminants are in Zion's water?

The contaminants EPA monitoring detected in Zion include Fluoride, Nitrate, Nitrate-Nitrite, Copper, TTHM. The full list, with the level at the main supplier 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.