Is Mascoutah Tap Water Safe? Quality Report

Water source: SWP
Ownership: Local government
Counties served: St. Clair

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
TT	Health-based	Resolved	2014-06-01 → 2014-06-30
TT	Health-based	Resolved	2014-06-01 → 2014-06-30
TT	Health-based	Resolved	2014-06-01 → 2014-06-30
TT	Health-based	Resolved	2014-06-01 → 2014-06-30
MCL	Health-based	Resolved	2005-09-01 → 2005-09-30
MCL	Health-based	Resolved	2005-09-01 → 2005-09-30
MCL	Health-based	Resolved	2005-09-01 → 2005-09-30
MCL	Health-based	Resolved	2005-09-01 → 2005-09-30
MCL	Health-based	Resolved	1995-04-01 → 1995-06-30
MCL	Health-based	Resolved	1995-04-01 → 1995-06-30

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Bromodichloromethane	20.9 µg/L No EPA limit set	65/65	SYR4	2012–2019
Chloroform	111.2 µg/L No EPA limit set	65/65	SYR4	2012–2019
TTHM	135 µg/L 169% of the EPA limit, in the worst sample — 80 µg/L	65/65	SYR4	2012–2019
Dichloroacetic Acid	39.5 µg/L No EPA limit set	63/63	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	71.6 µg/L 119% of the EPA limit, in the worst sample — 60 µg/L	63/63	SYR4	2012–2019
Trichloroacetic Acid	27 µg/L No EPA limit set	63/63	SYR4	2012–2019
Copper	1860 µg/L 143% of the EPA limit, in the worst sample — 1300 µg/L	54/60	SYR4	2012–2018
Dibromochloromethane	5.9 µg/L No EPA limit set	50/65	SYR4	2012–2019
Lead	29.3 µg/L 195% of the EPA limit, in the worst sample — 15 µg/L	31/60	SYR4	2012–2018
Lead	0.0060 mg/L 40% of the EPA limit 0.0150 mg/L	20/20	LCR	2025
Monobromoacetic Acid	3 µg/L No EPA limit set	15/63	SYR4	2012–2019
Monochloroacetic Acid	6.8 µg/L No EPA limit set	9/63	SYR4	2012–2019
Dibromoacetic Acid	1.8 µg/L No EPA limit set	8/63	SYR4	2012–2019

31 contaminants tested, none detected

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Utility contact

Contact: HAWKINS, CODY
Phone: 618-566-2964
Email: chawkins@mascoutah.com

Frequently asked questions about Mascoutah

Is Mascoutah tap water safe to drink?

EPA monitoring detected 13 contaminants in Mascoutah'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 Mascoutah's water?

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

How many people does Mascoutah serve?

Mascoutah reports serving 8,759 people in Illinois, per its EPA record.

Has Mascoutah had any water quality violations?

The EPA has 25 violations on file for Mascoutah, of which 14 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.