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Tap water quality report

Collinsville, IL

EPA monitoring detected 28 contaminants across the 1 water supplier serving Collinsville. 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.

1
water supplier
29,500
people served
28
contaminants found
Illinois rankings Lead in Illinois PFAS in Illinois

What was found in Collinsville'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
Nitrate
8910 µg/L 89%
of the EPA limit 10000 µg/L
Main supplier: COLLINSVILLE · 29,500 people · 2019
1/1 SYR4
Nitrate-Nitrite
4697.5 µg/L 47%
of the EPA limit 10000 µg/L
Main supplier: COLLINSVILLE · 29,500 people · 2018
1/1 SYR4
Fluoride
892.9 µg/L 22%
of the EPA limit 4000 µg/L
Main supplier: COLLINSVILLE · 29,500 people · 2018
1/1 SYR4
TTHM
64.37499999999999 µg/L 80%
of the EPA limit 80 µg/L
Main supplier: COLLINSVILLE · 29,500 people · 2019
1/1 SYR4
Dibromochloromethane
24.029999999999998 µg/L
No EPA limit set
Main supplier: COLLINSVILLE · 29,500 people · 2019
1/1 SYR4
Bromoform
19.99 µg/L
No EPA limit set
Main supplier: COLLINSVILLE · 29,500 people · 2019
1/1 SYR4
Barium
15.7 µg/L 0.8%
of the EPA limit 2000 µg/L
Main supplier: COLLINSVILLE · 29,500 people · 2018
1/1 SYR4
Bromodichloromethane
13.69 µg/L
No EPA limit set
Main supplier: COLLINSVILLE · 29,500 people · 2019
1/1 SYR4
Copper
12.404999999999983 µg/L 1%
of the EPA limit 1300 µg/L
Main supplier: COLLINSVILLE · 29,500 people · 2019
1/1 SYR4
Lead
10.229999999999997 µg/L 68%
of the EPA limit 15 µg/L
Main supplier: COLLINSVILLE · 29,500 people · 2019
1/1 SYR4
Chromium
9.395 µg/L 9.4%
of the EPA limit 100 µg/L
Main supplier: COLLINSVILLE · 29,500 people · 2018
1/1 SYR4
Chloroform
6.596199999999999 µg/L
No EPA limit set
Main supplier: COLLINSVILLE · 29,500 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
5.475 µg/L 9.1%
of the EPA limit 60 µg/L
Main supplier: COLLINSVILLE · 29,500 people · 2019
1/1 SYR4
Dibromoacetic Acid
5.405 µg/L
No EPA limit set
Main supplier: COLLINSVILLE · 29,500 people · 2019
1/1 SYR4
Selenium
5.2 µg/L 10%
of the EPA limit 50 µg/L
Main supplier: COLLINSVILLE · 29,500 people · 2018
1/1 SYR4
Dichloroacetic Acid
2.6 µg/L
No EPA limit set
Main supplier: COLLINSVILLE · 29,500 people · 2019
1/1 SYR4
Monobromoacetic Acid
1.72 µg/L
No EPA limit set
Main supplier: COLLINSVILLE · 29,500 people · 2019
1/1 SYR4
Arsenic
1.3 µg/L 13%
of the EPA limit 10 µg/L
Main supplier: COLLINSVILLE · 29,500 people · 2018
1/1 SYR4
Combined Radium (-226 And -228)
1.176 pCi/L 24%
of the EPA limit 5 pCi/L
Main supplier: COLLINSVILLE · 29,500 people · 2016
1/1 SYR4
Pfhxa
0.0220 µg/L
No EPA limit set
Main supplier: COLLINSVILLE · 29,500 people · 2024
1/1 UCMR-5
Pfpea
0.0210 µg/L
No EPA limit set
Main supplier: COLLINSVILLE · 29,500 people · 2024
1/1 UCMR-5
PFOA
0.0180 µg/L
No EPA limit set
Main supplier: COLLINSVILLE · 29,500 people · 2024
1/1 UCMR-5
PFBS
0.0160 µg/L
No EPA limit set
Main supplier: COLLINSVILLE · 29,500 people · 2024
1/1 UCMR-5
Pfba
0.0130 µg/L
No EPA limit set
Main supplier: COLLINSVILLE · 29,500 people · 2024
1/1 UCMR-5
Pfhpa
0.0130 µg/L
No EPA limit set
Main supplier: COLLINSVILLE · 29,500 people · 2024
1/1 UCMR-5
PFHXS
0.0120 µg/L
No EPA limit set
Main supplier: COLLINSVILLE · 29,500 people · 2024
1/1 UCMR-5
PFOS
0.0089 µg/L
No EPA limit set
Main supplier: COLLINSVILLE · 29,500 people · 2024
1/1 UCMR-5
Lead
0.0045 mg/L 30%
of the EPA limit 0.0150 mg/L
Main supplier: COLLINSVILLE · 29,500 people · 2025
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 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 Collinsville

SupplierPopulation served
COLLINSVILLE 29,500

Frequently asked questions about Collinsville tap water

Is Collinsville tap water safe to drink?

EPA testing detected 28 contaminants in the water serving Collinsville. 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 Collinsville?

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

What contaminants are in Collinsville's water?

The contaminants EPA monitoring detected in Collinsville include Nitrate, Nitrate-Nitrite, Fluoride, TTHM, Dibromochloromethane. 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.