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Tap water quality report

Northbrook

EPA monitoring tested this supplier for 107 contaminants and detected 20. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

107
contaminants tested
20
detected
34,407
people served
4
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.

4
health-based violations
15
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 1993-01-01
TT Health-based Resolved 1993-01-01
TT Health-based Resolved 1993-01-01
TT Health-based Resolved 1993-01-01
MR Monitoring Resolved 2023-07-01 → 2023-09-30
MR Monitoring Resolved 2023-07-01 → 2023-09-30
MR Monitoring Resolved 2023-07-01 → 2023-09-30
MR Monitoring Resolved 2023-07-01 → 2023-09-30
MR Monitoring Resolved 2020-12-30
MR Monitoring Resolved 2020-12-30

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
11.51 µg/L
No EPA limit set
worst single sample: 13.4 µg/L
107/107 SYR4 2012–2019
Chloroform
26.4 µg/L
No EPA limit set
worst single sample: 39.5 µg/L
107/107 SYR4 2012–2019
Dibromochloromethane
6.628 µg/L
No EPA limit set
worst single sample: 7.12 µg/L
107/107 SYR4 2012–2019
Dichloroacetic Acid
11.78 µg/L
No EPA limit set
worst single sample: 13.3 µg/L
107/107 SYR4 2012–2019
TTHM
43.26 µg/L 54%
of the EPA limit 80 µg/L
worst single sample: 58.3 µg/L
107/107 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
20.85 µg/L 35%
of the EPA limit 60 µg/L
worst single sample: 25.2 µg/L
107/107 SYR4 2012–2019
Trichloroacetic Acid
8.519 µg/L
No EPA limit set
worst single sample: 10.5 µg/L
107/107 SYR4 2012–2019
Monobromoacetic Acid
2.842 µg/L
No EPA limit set
worst single sample: 6.21 µg/L
67/107 SYR4 2012–2019
Dibromoacetic Acid
1.87 µg/L
No EPA limit set
worst single sample: 1.98 µg/L
37/107 SYR4 2012–2019
Lead
0.0110 mg/L 73%
of the EPA limit 0.0150 mg/L
 23/23 LCR 2026
Lead
13.475 µg/L 90%
of the EPA limit 15 µg/L
worst single sample: 19.1 µg/L
16/61 SYR4 2013–2017
Nitrate
432 µg/L 4.3%
of the EPA limit 10000 µg/L
 14/16 SYR4 2012–2019
Barium
22.09 µg/L 1.1%
of the EPA limit 2000 µg/L
worst single sample: 22.3 µg/L
8/8 SYR4 2012–2019
Fluoride
987.4 µg/L 25%
of the EPA limit 4000 µg/L
worst single sample: 1000 µg/L
8/8 SYR4 2012–2019
Copper
244.7 µg/L 19%
of the EPA limit 1300 µg/L
worst single sample: 269 µg/L
7/60 SYR4 2014–2017
Bromoform
0.6200 µg/L
No EPA limit set
worst single sample: 0.6220 µg/L
4/107 SYR4 2012–2019
Nitrate-Nitrite
393.95 µg/L 3.9%
of the EPA limit 10000 µg/L
worst single sample: 407 µg/L
4/4 SYR4 2012–2016
Arsenic
1.1 µg/L 11%
of the EPA limit 10 µg/L
 1/8 SYR4 2012–2019
Monochloroacetic Acid
2.42 µg/L
No EPA limit set
 1/107 SYR4 2012–2019
Selenium
2 µg/L 4%
of the EPA limit 50 µg/L
 1/8 SYR4 2012–2019
87 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 EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
RIZZO, JOSEPH
Phone
847-664-4139
Email
[email protected]

Frequently asked questions about Northbrook

Is Northbrook tap water safe to drink?

EPA monitoring detected 20 contaminants in Northbrook'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 Northbrook's water?

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

How many people does Northbrook serve?

Northbrook reports serving 34,407 people in Illinois, per its EPA record.

Has Northbrook had any water quality violations?

The EPA has 15 violations on file for Northbrook, of which 4 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.