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Tap water quality report

Zion

EPA monitoring tested this supplier for 44 contaminants and detected 12. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

44
contaminants tested
12
detected
24,442
people served
0
health-based violations
Illinois rankingsLead in IllinoisPFAS in Illinois
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.

0
health-based violations
10
violations on file
1
still open
ViolationTypeStatusPeriod
Other Monitoring Unaddressed 2025-07-01
Other Monitoring Resolved 2024-10-11
Other Monitoring Resolved 2024-10-11
MR Monitoring Resolved 2023-10-01
MR Monitoring Resolved 2023-10-01
MR Monitoring Resolved 2023-10-01
MR Monitoring Resolved 2023-10-01
Other Monitoring Resolved 2014-07-01
Other Monitoring Resolved 2014-07-01
MR Monitoring Archived 1996-03-01 → 1996-03-31

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Bromodichloromethane
14.28 µg/L
No EPA limit set
worst single sample: 19.9 µg/L
107/107 SYR4 2012–2019
Chloroform
38.33 µg/L
No EPA limit set
worst single sample: 51.9 µg/L
107/107 SYR4 2012–2019
Dibromochloromethane
6.47 µg/L
No EPA limit set
worst single sample: 7.8 µg/L
107/107 SYR4 2012–2019
TTHM
58.55 µg/L 73%
of the EPA limit 80 µg/L
worst single sample: 79.5 µg/L
107/107 SYR4 2012–2019
Dichloroacetic Acid
14.555 µg/L
No EPA limit set
worst single sample: 17.2 µg/L
104/104 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
25.79 µg/L 43%
of the EPA limit 60 µg/L
worst single sample: 30.9 µg/L
104/104 SYR4 2012–2019
Trichloroacetic Acid
11.69 µg/L
No EPA limit set
worst single sample: 13.1 µg/L
103/104 SYR4 2012–2019
Dibromoacetic Acid
1.6 µg/L
No EPA limit set
worst single sample: 1.7 µg/L
56/104 SYR4 2012–2019
Lead
0.0091 mg/L 61%
of the EPA limit 0.0150 mg/L
 20/20 LCR 2026
Copper
442 µg/L 34%
of the EPA limit 1300 µg/L
worst single sample: 478 µg/L
16/60 SYR4 2014–2017
Lead
6.836 µg/L 46%
of the EPA limit 15 µg/L
worst single sample: 7 µg/L
3/60 SYR4 2014–2017
Lithium
43.3 µg/L
No EPA limit set
 1/4 UCMR-5 2025
32 contaminants tested, none detected
11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaBromoformHfpo-DaMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfuna

Utility contact

Contact
RANSOM, VICTOR
Phone
847-746-4054
Email
[email protected]

Frequently asked questions about Zion

Is Zion tap water safe to drink?

EPA monitoring detected 12 contaminants in Zion'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 Zion's water?

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

How many people does Zion serve?

Zion reports serving 24,442 people in Illinois, per its EPA record.

Has Zion had any water quality violations?

The EPA has 10 violations on file for Zion, of which 0 are health-based (a contaminant limit or required treatment was breached) and 1 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.