Is Du Quoin, IL Tap Water Safe? Quality & Contaminants

What was found in Du Quoin's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Copper	91.3 µg/L 7% of the EPA limit 1300 µg/L Main supplier: DUQUOIN · 7,169 people · 2017	1/2	SYR4
TTHM	64.23 µg/L 80% of the EPA limit 80 µg/L Main supplier: DUQUOIN · 7,169 people · 2019	1/2	SYR4
Chloroform	51.405 µg/L No EPA limit set Main supplier: DUQUOIN · 7,169 people · 2019	1/2	SYR4
Total Haloacetic Acids (HAA5)	37.22 µg/L 62% of the EPA limit 60 µg/L Main supplier: DUQUOIN · 7,169 people · 2019	1/2	SYR4
Dichloroacetic Acid	23.835 µg/L No EPA limit set Main supplier: DUQUOIN · 7,169 people · 2019	1/2	SYR4
Lead	22.2 µg/L 148% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: DUQUOIN · 7,169 people · 2017	1/2	SYR4
Monobromoacetic Acid	11.725 µg/L No EPA limit set Main supplier: DUQUOIN · 7,169 people · 2019	1/2	SYR4
Bromodichloromethane	10.9445 µg/L No EPA limit set Main supplier: DUQUOIN · 7,169 people · 2019	1/2	SYR4
Trichloroacetic Acid	5.8505 µg/L No EPA limit set Main supplier: DUQUOIN · 7,169 people · 2019	1/2	SYR4
Monochloroacetic Acid	4.8285 µg/L No EPA limit set Main supplier: DUQUOIN · 7,169 people · 2019	1/2	SYR4
Dibromochloromethane	3.9695 µg/L No EPA limit set Main supplier: DUQUOIN · 7,169 people · 2019	1/2	SYR4
Dibromoacetic Acid	1.5545 µg/L No EPA limit set Main supplier: DUQUOIN · 7,169 people · 2019	1/2	SYR4
Bromoform	0.5500 µg/L No EPA limit set Main supplier: DUQUOIN · 7,169 people · 2019	1/2	SYR4
Pfba	0.0058 µg/L No EPA limit set Main supplier: DUQUOIN · 7,169 people · 2024	1/2	UCMR-5
Lead	0.0030 mg/L 20% of the EPA limit 0.0150 mg/L Main supplier: DUQUOIN · 7,169 people · 2025	2/2	LCR

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 the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Du Quoin

Supplier	Population served
DUQUOIN	7,169
CROSSROADS MHP	53

Frequently asked questions about Du Quoin tap water

Is Du Quoin tap water safe to drink?

EPA testing detected 15 contaminants in the water serving Du Quoin. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Du Quoin?

2 public water suppliers report drinking-water monitoring for Du Quoin, Illinois to the EPA. Each is listed above with its population served.

What contaminants are in Du Quoin's water?

The contaminants EPA monitoring detected in Du Quoin include Copper, TTHM, Chloroform, Total Haloacetic Acids (HAA5), Dichloroacetic Acid. The full list, with the level at the main supplier and the data source, is in the table above.

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.