Is Lemont, IL Tap Water Safe? Quality & Contaminants

What was found in Lemont'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
Fluoride	1342 µg/L 34% of the EPA limit 4000 µg/L Main supplier: LEMONT · 17,500 people · 2019	1/2	SYR4
Copper	151.5 µg/L 12% of the EPA limit 1300 µg/L Main supplier: LEMONT · 17,500 people · 2017 Highest in the city: 213.5 µg/L — FRANCISCAN SISTERS OF CHICAGO · 505 people · 2018	2/2	SYR4
Lithium	53.8 µg/L No EPA limit set Main supplier: LEMONT · 17,500 people · 2024	1/2	UCMR-5
Barium	32.6 µg/L 1.6% of the EPA limit 2000 µg/L Main supplier: LEMONT · 17,500 people · 2019	1/2	SYR4
Xylenes, Total	13.76 µg/L 0.1% of the EPA limit 10000 µg/L Main supplier: LEMONT · 17,500 people · 2019	1/2	SYR4
Combined Radium (-226 And -228)	13.555 pCi/L 271% of the EPA limit, at the 95th percentile of samples — 5 pCi/L Main supplier: LEMONT · 17,500 people · 2019	1/2	SYR4
Lead	7.665 µg/L 51% of the EPA limit 15 µg/L Main supplier: LEMONT · 17,500 people · 2017	2/2	SYR4
Ethylbenzene	5.918 µg/L 0.8% of the EPA limit 700 µg/L Main supplier: LEMONT · 17,500 people · 2019	1/2	SYR4
Chromium	4 µg/L 4% of the EPA limit 100 µg/L Main supplier: LEMONT · 17,500 people · 2019	1/2	SYR4
Arsenic	2.62 µg/L 26% of the EPA limit 10 µg/L Main supplier: LEMONT · 17,500 people · 2019	1/2	SYR4
Selenium	2.2 µg/L 4.4% of the EPA limit 50 µg/L Main supplier: LEMONT · 17,500 people · 2019	1/2	SYR4
Toluene	1.4 µg/L 0.1% of the EPA limit 1000 µg/L Main supplier: LEMONT · 17,500 people · 2019	1/2	SYR4
Mercury	1.3 µg/L 65% of the EPA limit 2 µg/L Main supplier: LEMONT · 17,500 people · 2019	1/2	SYR4
Lead	0.0200 mg/L 133% above the EPA limit of 0.0150 mg/L Main supplier: LEMONT · 17,500 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 Lemont

Supplier	Population served
LEMONT	17,500
FRANCISCAN SISTERS OF CHICAGO	505

Frequently asked questions about Lemont tap water

Is Lemont tap water safe to drink?

EPA testing detected 14 contaminants in the water serving Lemont. 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 Lemont?

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

What contaminants are in Lemont's water?

The contaminants EPA monitoring detected in Lemont include Fluoride, Copper, Lithium, Barium, Xylenes, Total. 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.