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Tap water quality report

Maryville, IL

EPA monitoring detected 20 contaminants across the 1 water supplier serving Maryville. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

1
water supplier
10,150
people served
20
contaminants found
Illinois rankings Lead in Illinois PFAS in Illinois

What was found in Maryville's water

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

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
9270 µg/L 93%
of the EPA limit 10000 µg/L
 1/1 SYR4
Nitrate-Nitrite
9270 µg/L 93%
of the EPA limit 10000 µg/L
 1/1 SYR4
Copper
1576 µg/L 121%
of the EPA limit, in the worst sample — 1300 µg/L
 1/1 SYR4
Fluoride
1010 µg/L 25%
of the EPA limit 4000 µg/L
 1/1 SYR4
Barium
140 µg/L 7%
of the EPA limit 2000 µg/L
 1/1 SYR4
TTHM
33.3 µg/L 42%
of the EPA limit 80 µg/L
 1/1 SYR4
Dibromochloromethane
14 µg/L
No EPA limit set
 1/1 SYR4
Bromodichloromethane
9.8 µg/L
No EPA limit set
 1/1 SYR4
Total Haloacetic Acids (HAA5)
7.5 µg/L 13%
of the EPA limit 60 µg/L
 1/1 SYR4
Lead
7 µg/L 47%
of the EPA limit 15 µg/L
 1/1 SYR4
Bromoform
5.9 µg/L
No EPA limit set
 1/1 SYR4
Chloroform
4.2 µg/L
No EPA limit set
 1/1 SYR4
Dibromoacetic Acid
4.2 µg/L
No EPA limit set
 1/1 SYR4
Selenium
3 µg/L 6%
of the EPA limit 50 µg/L
 1/1 SYR4
Dichloroacetic Acid
2.1 µg/L
No EPA limit set
 1/1 SYR4
Arsenic
1.9 µg/L 19%
of the EPA limit 10 µg/L
 1/1 SYR4
Trichloroacetic Acid
1.6 µg/L
No EPA limit set
 1/1 SYR4
Xylenes, Total
1.5 µg/L 0%
of the EPA limit 10000 µg/L
 1/1 SYR4
Monobromoacetic Acid
1.4 µg/L
No EPA limit set
 1/1 SYR4
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
 1/1 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 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 Maryville

SupplierPopulation served
MARYVILLE 10,150

Frequently asked questions about Maryville tap water

Is Maryville tap water safe to drink?

EPA testing detected 20 contaminants in the water serving Maryville. 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 Maryville?

1 public water supplier report drinking-water monitoring for Maryville, Illinois to the EPA. Each is listed above with its population served.

What contaminants are in Maryville's water?

The contaminants EPA monitoring detected in Maryville include Nitrate, Nitrate-Nitrite, Copper, Fluoride, Barium. 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.