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Tap water quality report

Winnetka

EPA monitoring tested this supplier for 107 contaminants and detected 18. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

107
contaminants tested
18
detected
12,475
people served
0
health-based violations
Illinois rankingsLead in IllinoisPFAS in Illinois
Water source
Surface water
Ownership
Local government
Counties served
Cook

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
15
violations on file
0
still open
ViolationTypeStatusPeriod
Other Monitoring Resolved 2010-07-01
Other Monitoring Resolved 2010-07-01
MR Monitoring Resolved 2006-12-01 → 2006-12-31
MR Monitoring Resolved 2006-12-01 → 2006-12-31
MR Monitoring Resolved 2006-10-01 → 2006-12-31
MR Monitoring Resolved 2006-10-01 → 2006-12-31
MR Monitoring Archived 1979-06-25 → 1980-06-24
MR Monitoring Archived 1979-06-25 → 1980-06-24
MR Monitoring Archived 1979-06-25 → 1980-06-24
MR Monitoring Archived 1979-06-25 → 1980-06-24

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
14.4 µg/L
No EPA limit set
worst single sample: 15 µg/L
79/79 SYR4 2012–2019
Chloroform
19.69 µg/L
No EPA limit set
worst single sample: 29.8 µg/L
79/79 SYR4 2012–2019
Dibromochloromethane
8.568 µg/L
No EPA limit set
worst single sample: 9.83 µg/L
79/79 SYR4 2012–2019
TTHM
45.01 µg/L 56%
of the EPA limit 80 µg/L
worst single sample: 50.2 µg/L
79/79 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
21.68 µg/L 36%
of the EPA limit 60 µg/L
worst single sample: 26.4 µg/L
77/79 SYR4 2012–2019
Trichloroacetic Acid
7.38 µg/L
No EPA limit set
worst single sample: 11 µg/L
77/79 SYR4 2012–2019
Bromoform
2.8525 µg/L
No EPA limit set
worst single sample: 4.589 µg/L
76/79 SYR4 2012–2019
Dibromoacetic Acid
2.485 µg/L
No EPA limit set
worst single sample: 3.36 µg/L
64/79 SYR4 2012–2019
Dichloroacetic Acid
12.575 µg/L
No EPA limit set
worst single sample: 14.3 µg/L
58/79 SYR4 2012–2019
Copper
495.05 µg/L 38%
of the EPA limit 1300 µg/L
worst single sample: 590 µg/L
42/60 SYR4 2014–2017
Lead
8.805 µg/L 59%
of the EPA limit 15 µg/L
worst single sample: 12 µg/L
42/60 SYR4 2014–2017
Lead
0.0085 mg/L 57%
of the EPA limit 0.0150 mg/L
 18/18 LCR 2025
Nitrate
600 µg/L 6%
of the EPA limit 10000 µg/L
 14/16 SYR4 2012–2019
Barium
22 µg/L 1.1%
of the EPA limit 2000 µg/L
 8/8 SYR4 2012–2019
Fluoride
1132.5 µg/L 28%
of the EPA limit 4000 µg/L
worst single sample: 1150 µg/L
8/8 SYR4 2012–2019
Monobromoacetic Acid
2.17 µg/L
No EPA limit set
worst single sample: 2.21 µg/L
6/79 SYR4 2012–2019
Arsenic
1.37 µg/L 14%
of the EPA limit 10 µg/L
worst single sample: 1.4 µg/L
4/8 SYR4 2012–2019
Combined Radium (-226 And -228)
0.8370 pCi/L 17%
of the EPA limit 5 pCi/L
 1/1 SYR4 2014
89 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, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
NARHI, NICHOLAS
Phone
847-716-3556
Email
[email protected]

Frequently asked questions about Winnetka

Is Winnetka tap water safe to drink?

EPA monitoring detected 18 contaminants in Winnetka'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 Winnetka's water?

EPA monitoring detected Bromodichloromethane, Chloroform, Dibromochloromethane, TTHM, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Winnetka serve?

Winnetka reports serving 12,475 people in Illinois, per its EPA record.

Has Winnetka had any water quality violations?

The EPA has 15 violations on file for Winnetka, of which 0 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.