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Tap water quality report

Mount Vernon, IL

EPA monitoring detected 13 contaminants across the 2 water suppliers serving Mount Vernon. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

2
water suppliers
16,178
people served
13
contaminants found
Illinois rankings Lead in Illinois PFAS in Illinois

What was found in Mount Vernon'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.

ContaminantLevel vs EPA limitSuppliersSource
Copper
225.2 µg/L 17%
of the EPA limit 1300 µg/L
Main supplier: MOUNT VERNON · 15,793 people · 2017
1/2 SYR4
TTHM
52.729999999999976 µg/L 66%
of the EPA limit 80 µg/L
Main supplier: MOUNT VERNON · 15,793 people · 2019
1/2 SYR4
Chloroform
38.05999999999999 µg/L
No EPA limit set
Main supplier: MOUNT VERNON · 15,793 people · 2019
1/2 SYR4
Lead
34.7 µg/L 231%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: MOUNT VERNON · 15,793 people · 2017
1/2 SYR4
Total Haloacetic Acids (HAA5)
28 µg/L 47%
of the EPA limit 60 µg/L
Main supplier: MOUNT VERNON · 15,793 people · 2019
1/2 SYR4
Dichloroacetic Acid
23.48999999999999 µg/L
No EPA limit set
Main supplier: MOUNT VERNON · 15,793 people · 2019
1/2 SYR4
Bromodichloromethane
10.8 µg/L
No EPA limit set
Main supplier: MOUNT VERNON · 15,793 people · 2019
1/2 SYR4
Trichloroacetic Acid
4.7 µg/L
No EPA limit set
Main supplier: MOUNT VERNON · 15,793 people · 2019
1/2 SYR4
Dibromochloromethane
3.9450000000000003 µg/L
No EPA limit set
Main supplier: MOUNT VERNON · 15,793 people · 2019
1/2 SYR4
Monochloroacetic Acid
3.01 µg/L
No EPA limit set
Main supplier: MOUNT VERNON · 15,793 people · 2019
1/2 SYR4
Dibromoacetic Acid
1.5 µg/L
No EPA limit set
Main supplier: MOUNT VERNON · 15,793 people · 2019
1/2 SYR4
Pfba
0.0099 µg/L
No EPA limit set
Main supplier: MOUNT VERNON · 15,793 people · 2024
1/2 UCMR-5
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: MOUNT VERNON · 15,793 people · 2025
Highest in the city: 0.0024 mg/L — OAK GROVE VILLAGE · 385 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 Mount Vernon

SupplierPopulation served
MOUNT VERNON 15,793
OAK GROVE VILLAGE 385

Frequently asked questions about Mount Vernon tap water

Is Mount Vernon tap water safe to drink?

EPA testing detected 13 contaminants in the water serving Mount Vernon. 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 Mount Vernon?

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

What contaminants are in Mount Vernon's water?

The contaminants EPA monitoring detected in Mount Vernon include Copper, TTHM, Chloroform, Lead, Total Haloacetic Acids (HAA5). 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.