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Tap water quality report

Cahokia, IL

EPA monitoring detected 5 contaminants across the 1 water supplier serving Cahokia. 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
12,528
people served
5
contaminants found
Illinois rankings Lead in Illinois PFAS in Illinois

What was found in Cahokia'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
Lithium
21.8 µg/L
No EPA limit set
 1/1 UCMR-5
Pfba
0.0148 µg/L
No EPA limit set
 1/1 UCMR-5
Pfhxa
0.0036 µg/L
No EPA limit set
 1/1 UCMR-5
Pfpea
0.0031 µg/L
No EPA limit set
 1/1 UCMR-5
Lead
0.0 mg/L 0%
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 Cahokia

SupplierPopulation served
CAHOKIA HEIGHTS 12,528

Frequently asked questions about Cahokia tap water

Is Cahokia tap water safe to drink?

EPA testing detected 5 contaminants in the water serving Cahokia. 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 Cahokia?

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

What contaminants are in Cahokia's water?

The contaminants EPA monitoring detected in Cahokia include Lithium, Pfba, Pfhxa, Pfpea, Lead. 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.