Is Granite City, IL Tap Water Safe? Quality & Contaminants

What was found in Granite City's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate	4980 µg/L 50% of the EPA limit 10000 µg/L	1/2	SYR4
Copper	1121 µg/L 86% of the EPA limit 1300 µg/L	2/2	SYR4
Fluoride	1040 µg/L 26% of the EPA limit 4000 µg/L	1/2	SYR4
TTHM	76.2 µg/L 95% of the EPA limit 80 µg/L	2/2	SYR4
Chloroform	62.2 µg/L No EPA limit set	2/2	SYR4
Total Haloacetic Acids (HAA5)	51.6 µg/L 86% of the EPA limit 60 µg/L	2/2	SYR4
Dichloroacetic Acid	27.7 µg/L No EPA limit set	2/2	SYR4
Trichloroacetic Acid	15.6 µg/L No EPA limit set	2/2	SYR4
Monochloroacetic Acid	15 µg/L No EPA limit set	2/2	SYR4
Bromodichloromethane	13.9 µg/L No EPA limit set	2/2	SYR4
Lithium	13.4 µg/L No EPA limit set	1/2	UCMR-5
Lead	8 µg/L 53% of the EPA limit 15 µg/L	1/2	SYR4
Monobromoacetic Acid	5.9 µg/L No EPA limit set	2/2	SYR4
Dibromochloromethane	3.9 µg/L No EPA limit set	2/2	SYR4
Dibromoacetic Acid	2.8 µg/L No EPA limit set	2/2	SYR4
Arsenic	2 µg/L 20% of the EPA limit 10 µg/L	1/2	SYR4
Atrazine	0.5000 µg/L 17% of the EPA limit 3 µg/L	1/2	SYR4
Carbon Tetrachloride	0.5000 µg/L 10% of the EPA limit 5 µg/L	1/2	SYR4
PFBS	0.0210 µg/L No EPA limit set	1/2	UCMR-5
Pfba	0.0174 µg/L No EPA limit set	2/2	UCMR-5
Lead	0.0060 mg/L 40% of the EPA limit 0.0150 mg/L	2/2	LCR
Pfpea	0.0045 µg/L No EPA limit set	2/2	UCMR-5
Pfhxa	0.0043 µg/L No EPA limit set	2/2	UCMR-5

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. 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 Granite City

Supplier	Population served
IL AMERICAN-GRANITE CITY	33,572
MITCHELL PWD	5,253

Frequently asked questions about Granite City tap water

Is Granite City tap water safe to drink?

EPA testing detected 23 contaminants in the water serving Granite City. 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 Granite City?

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

What contaminants are in Granite City's water?

The contaminants EPA monitoring detected in Granite City include Nitrate, Copper, Fluoride, TTHM, Chloroform. The full list, with the highest level found 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.