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Tap water quality report

Lemont

EPA monitoring tested this supplier for 109 contaminants and detected 14. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

109
contaminants tested
14
detected
17,500
people served
90
health-based violations
Illinois rankingsLead in IllinoisPFAS in Illinois
Water source
Ground water
Ownership
Local government
Counties served
Cook

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.

90
health-based violations
136
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2025-08-31
TT Health-based Resolved 2025-08-31
TT Health-based Resolved 2025-08-31
TT Health-based Resolved 2025-08-31
MCL Health-based Resolved 2015-10-01 → 2015-12-31
MCL Health-based Resolved 2015-10-01 → 2015-12-31
MCL Health-based Resolved 2015-10-01 → 2015-12-31
MCL Health-based Resolved 2015-10-01 → 2015-12-31
MCL Health-based Resolved 2015-07-01 → 2015-09-30
MCL Health-based Resolved 2015-07-01 → 2015-09-30

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 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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Combined Radium (-226 And -228)
13.555 pCi/L 271%
of the EPA limit, at the 95th percentile of samples — 5 pCi/L
worst single sample: 25.7 pCi/L
78/84 SYR4 2013–2019
Copper
151.5 µg/L 12%
of the EPA limit 1300 µg/L
worst single sample: 270 µg/L
60/60 SYR4 2014–2017
Lead
7.665 µg/L 51%
of the EPA limit 15 µg/L
worst single sample: 11 µg/L
28/60 SYR4 2014–2017
Lead
0.0200 mg/L 133%
above the EPA limit of 0.0150 mg/L
 17/17 LCR 2025
Barium
32.6 µg/L 1.6%
of the EPA limit 2000 µg/L
worst single sample: 34 µg/L
15/15 SYR4 2012–2019
Fluoride
1342 µg/L 34%
of the EPA limit 4000 µg/L
worst single sample: 1420 µg/L
14/15 SYR4 2012–2019
Arsenic
2.62 µg/L 26%
of the EPA limit 10 µg/L
worst single sample: 3.1 µg/L
9/15 SYR4 2012–2019
Lithium
53.8 µg/L
No EPA limit set
 8/8 UCMR-5 2024
Xylenes, Total
13.76 µg/L 0.1%
of the EPA limit 10000 µg/L
worst single sample: 15 µg/L
3/24 SYR4 2012–2019
Ethylbenzene
5.918 µg/L 0.8%
of the EPA limit 700 µg/L
worst single sample: 6.2 µg/L
2/25 SYR4 2012–2019
Chromium
4 µg/L 4%
of the EPA limit 100 µg/L
 1/15 SYR4 2012–2019
Mercury
1.3 µg/L 65%
of the EPA limit 2 µg/L
 1/15 SYR4 2012–2019
Selenium
2.2 µg/L 4.4%
of the EPA limit 50 µg/L
 1/15 SYR4 2012–2019
Toluene
1.4 µg/L 0.1%
of the EPA limit 1000 µg/L
 1/24 SYR4 2012–2019
95 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDibromochloromethaneDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitrateNitrate-NitriteNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTotal Haloacetic Acids (HAA5)Total Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
SCHAFER, GEORGE
Phone
630-257-1550
Email
gschafer@lemont.il.us

Frequently asked questions about Lemont

Is Lemont tap water safe to drink?

EPA monitoring detected 14 contaminants in Lemont'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 Lemont's water?

EPA monitoring detected Combined Radium (-226 And -228), Copper, Lead, Lead, Barium, and others. The full list with the level and data source for each is above.

How many people does Lemont serve?

Lemont reports serving 17,500 people in Illinois, per its EPA record.

Has Lemont had any water quality violations?

The EPA has 136 violations on file for Lemont, of which 90 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.