Is Algonquin Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: McHenry

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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2006-08-01 → 2006-08-31
MCL	Health-based	Resolved	2006-08-01 → 2006-08-31
MCL	Health-based	Resolved	2006-08-01 → 2006-08-31
MCL	Health-based	Resolved	2006-08-01 → 2006-08-31
TT	Health-based	Resolved	1993-09-02
TT	Health-based	Resolved	1993-07-01
TT	Health-based	Resolved	1993-07-01
TT	Health-based	Resolved	1993-07-01
TT	Health-based	Resolved	1993-07-01
TT	Health-based	Resolved	1993-07-01

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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Chloroform	39.675 µg/L No EPA limit set worst single sample: 59.6 µg/L	102/102	SYR4	2012–2019
TTHM	71.17 µg/L 89% of the EPA limit 80 µg/L worst single sample: 110.5 µg/L	102/102	SYR4	2012–2019
Bromodichloromethane	21.8 µg/L No EPA limit set worst single sample: 31.9 µg/L	101/102	SYR4	2012–2019
Dibromochloromethane	11.705 µg/L No EPA limit set worst single sample: 17.4 µg/L	100/102	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	37.87 µg/L 63% of the EPA limit 60 µg/L worst single sample: 49 µg/L	99/102	SYR4	2012–2019
Trichloroacetic Acid	17.7 µg/L No EPA limit set worst single sample: 21.3 µg/L	99/102	SYR4	2012–2019
Dichloroacetic Acid	18.5 µg/L No EPA limit set worst single sample: 26.1 µg/L	89/102	SYR4	2012–2019
Dibromoacetic Acid	3.191 µg/L No EPA limit set worst single sample: 3.69 µg/L	88/102	SYR4	2012–2019
Copper	1377.5 µg/L 106% of the EPA limit, at the 95th percentile of samples — 1300 µg/L worst single sample: 2080 µg/L	86/90	SYR4	2012–2018
Lead	12.86 µg/L 86% of the EPA limit 15 µg/L worst single sample: 85.1 µg/L	58/90	SYR4	2012–2018
Bromoform	2.636 µg/L No EPA limit set worst single sample: 4.457 µg/L	45/102	SYR4	2012–2019
Nitrate	2000 µg/L 20% of the EPA limit 10000 µg/L	40/70	SYR4	2012–2019
Lead	0.0023 mg/L 15% of the EPA limit 0.0150 mg/L	26/26	LCR	2025
Nitrate-Nitrite	2000 µg/L 20% of the EPA limit 10000 µg/L	12/12	SYR4	2012–2018
Barium	456 µg/L 23% of the EPA limit 2000 µg/L worst single sample: 460 µg/L	9/9	SYR4	2012–2018
Fluoride	1005.6 µg/L 25% of the EPA limit 4000 µg/L worst single sample: 1060 µg/L	9/9	SYR4	2012–2018
Combined Radium (-226 And -228)	3.645 pCi/L 73% of the EPA limit 5 pCi/L worst single sample: 3.77 pCi/L	6/10	SYR4	2013–2019
Monobromoacetic Acid	6.402 µg/L No EPA limit set worst single sample: 6.7 µg/L	5/102	SYR4	2012–2019
Monochloroacetic Acid	2.348 µg/L No EPA limit set worst single sample: 2.36 µg/L	4/102	SYR4	2012–2019
Arsenic	1.1 µg/L 11% of the EPA limit 10 µg/L	1/9	SYR4	2012–2018

88 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 EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: BADRAN, NADIM
Phone: 847-658-2700
Email: [email protected]

Frequently asked questions about Algonquin

Is Algonquin tap water safe to drink?

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

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

How many people does Algonquin serve?

Algonquin reports serving 30,700 people in Illinois, per its EPA record.

Has Algonquin had any water quality violations?

The EPA has 56 violations on file for Algonquin, of which 29 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.