Is Collinsville Tap Water Safe? Quality Report

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

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	Archived	1995-12-01 → 1995-12-31
MCL	Health-based	Archived	1995-12-01 → 1995-12-31
MCL	Health-based	Archived	1995-12-01 → 1995-12-31
MCL	Health-based	Archived	1995-09-01 → 1995-09-30
MCL	Health-based	Archived	1995-09-01 → 1995-09-30
MCL	Health-based	Archived	1995-09-01 → 1995-09-30
MCL	Health-based	Archived	1994-08-01 → 1994-08-31
MCL	Health-based	Archived	1994-08-01 → 1994-08-31
MCL	Health-based	Archived	1994-01-01 → 1994-01-31
MCL	Health-based	Archived	1994-01-01 → 1994-01-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
Pfba	0.0130 µg/L	1/2	2024
PFBS	0.0160 µg/L	1/2	2024
Pfhpa	0.0130 µg/L	1/2	2024
Pfhxa	0.0220 µg/L	1/2	2024
PFHXS	0.0120 µg/L	1/2	2024
PFOA	0.0180 µg/L	1/2	2024
PFOS	0.0089 µg/L	1/2	2024
Pfpea	0.0210 µg/L	1/2	2024

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
Nitrate	8910 µg/L 89% of the EPA limit 10000 µg/L worst single sample: 10600 µg/L	162/206	SYR4	2012–2019
Copper	12.405 µg/L 1% of the EPA limit 1300 µg/L worst single sample: 25 µg/L	34/120	SYR4	2014–2019
Bromodichloromethane	13.69 µg/L No EPA limit set worst single sample: 16.3 µg/L	32/32	SYR4	2012–2019
Bromoform	19.99 µg/L No EPA limit set worst single sample: 27.4 µg/L	32/32	SYR4	2012–2019
Chloroform	6.5962 µg/L No EPA limit set worst single sample: 9.46 µg/L	32/32	SYR4	2012–2019
Dibromochloromethane	24.03 µg/L No EPA limit set worst single sample: 29.3 µg/L	32/32	SYR4	2012–2019
TTHM	64.375 µg/L 80% of the EPA limit 80 µg/L worst single sample: 75.2 µg/L	32/32	SYR4	2012–2019
Dibromoacetic Acid	5.405 µg/L No EPA limit set worst single sample: 5.54 µg/L	31/32	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	5.475 µg/L 9.1% of the EPA limit 60 µg/L worst single sample: 7.7 µg/L	31/32	SYR4	2012–2019
Lead	0.0045 mg/L 30% of the EPA limit 0.0150 mg/L	21/21	LCR	2025
Lead	10.23 µg/L 68% of the EPA limit 15 µg/L worst single sample: 11.7 µg/L	7/120	SYR4	2014–2019
Barium	15.7 µg/L 0.8% of the EPA limit 2000 µg/L worst single sample: 16 µg/L	3/3	SYR4	2012–2018
Fluoride	892.9 µg/L 22% of the EPA limit 4000 µg/L worst single sample: 902 µg/L	3/3	SYR4	2012–2018
Chromium	9.395 µg/L 9.4% of the EPA limit 100 µg/L worst single sample: 9.6 µg/L	2/3	SYR4	2012–2018
Nitrate-Nitrite	4697.5 µg/L 47% of the EPA limit 10000 µg/L worst single sample: 4750 µg/L	2/4	SYR4	2012–2018
Arsenic	1.3 µg/L 13% of the EPA limit 10 µg/L	1/3	SYR4	2012–2018
Combined Radium (-226 And -228)	1.176 pCi/L 24% of the EPA limit 5 pCi/L	1/1	SYR4	2016
Dichloroacetic Acid	2.6 µg/L No EPA limit set	1/32	SYR4	2012–2019
Monobromoacetic Acid	1.72 µg/L No EPA limit set	1/32	SYR4	2012–2019
Selenium	5.2 µg/L 10% of the EPA limit 50 µg/L	1/3	SYR4	2012–2018

78 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfdaPfdoaPfeesaPfhpsPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: JONES, WILLIAM
Phone: 618-346-5211
Email: [email protected]

Frequently asked questions about Collinsville

Is Collinsville tap water safe to drink?

EPA monitoring detected 28 contaminants in Collinsville'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 Collinsville's water?

EPA monitoring detected Nitrate, Copper, Bromodichloromethane, Bromoform, Chloroform, and others. The full list with the level and data source for each is above.

How many people does Collinsville serve?

Collinsville reports serving 29,500 people in Illinois, per its EPA record.

Has Collinsville had any water quality violations?

The EPA has 47 violations on file for Collinsville, of which 32 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.