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Tap water quality report

Centralia, IL

EPA monitoring detected 21 contaminants across the 3 water suppliers serving Centralia. 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.

3
water suppliers
15,529
people served
21
contaminants found
Illinois rankings Lead in Illinois PFAS in Illinois

What was found in Centralia'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
1900 µg/L 19%
of the EPA limit 10000 µg/L
Main supplier: CENTRALIA · 12,182 people · 2019
1/3 SYR4
Nitrate-Nitrite
1810 µg/L 18%
of the EPA limit 10000 µg/L
Main supplier: CENTRALIA · 12,182 people · 2018
1/3 SYR4
Fluoride
1119 µg/L 28%
of the EPA limit 4000 µg/L
Main supplier: CENTRALIA · 12,182 people · 2019
1/3 SYR4
Copper
461 µg/L 35%
of the EPA limit 1300 µg/L
Main supplier: CENTRALIA · 12,182 people · 2018
Highest in the city: 624.4 µg/L — CLINTON COUNTY EAST PWD · 1,950 people · 2017
2/3 SYR4
TTHM
68.929 µg/L 86%
of the EPA limit 80 µg/L
Main supplier: CENTRALIA · 12,182 people · 2019
Highest in the city: 77.21 µg/L — CLINTON COUNTY EAST PWD · 1,950 people · 2019
2/3 SYR4
Chloroform
53.5275 µg/L
No EPA limit set
Main supplier: CENTRALIA · 12,182 people · 2019
Highest in the city: 63.68 µg/L — CLINTON COUNTY EAST PWD · 1,950 people · 2019
2/3 SYR4
Barium
55.95 µg/L 2.8%
of the EPA limit 2000 µg/L
Main supplier: CENTRALIA · 12,182 people · 2019
1/3 SYR4
Total Haloacetic Acids (HAA5)
28.52 µg/L 48%
of the EPA limit 60 µg/L
Main supplier: CENTRALIA · 12,182 people · 2019
Highest in the city: 54.155 µg/L — CLINTON COUNTY EAST PWD · 1,950 people · 2019
2/3 SYR4
Trichloroacetic Acid
11 µg/L
No EPA limit set
Main supplier: CENTRALIA · 12,182 people · 2019
Highest in the city: 32.915 µg/L — CLINTON COUNTY EAST PWD · 1,950 people · 2019
2/3 SYR4
Dichloroacetic Acid
15.15 µg/L
No EPA limit set
Main supplier: CENTRALIA · 12,182 people · 2019
Highest in the city: 25.85 µg/L — CLINTON COUNTY EAST PWD · 1,950 people · 2019
2/3 SYR4
Monobromoacetic Acid
20.4 µg/L
No EPA limit set
Main supplier: CENTRALIA · 12,182 people · 2019
2/3 SYR4
Bromodichloromethane
11.065 µg/L
No EPA limit set
Main supplier: CENTRALIA · 12,182 people · 2019
Highest in the city: 15.8625 µg/L — CLINTON COUNTY EAST PWD · 1,950 people · 2019
2/3 SYR4
Lead
3.92 µg/L 26%
of the EPA limit 15 µg/L
Main supplier: CENTRALIA · 12,182 people · 2018
Highest in the city: 12.925 µg/L — CLINTON COUNTY EAST PWD · 1,950 people · 2017
2/3 SYR4
Dibromochloromethane
4.6695 µg/L
No EPA limit set
Main supplier: CENTRALIA · 12,182 people · 2019
2/3 SYR4
Monochloroacetic Acid
3.8245 µg/L
No EPA limit set
Main supplier: CENTRALIA · 12,182 people · 2019
1/3 SYR4
Dibromoacetic Acid
2.775 µg/L
No EPA limit set
Main supplier: CENTRALIA · 12,182 people · 2019
2/3 SYR4
Bromoform
1.8173 µg/L
No EPA limit set
Main supplier: CENTRALIA · 12,182 people · 2019
1/3 SYR4
Arsenic
1.8 µg/L 18%
of the EPA limit 10 µg/L
Main supplier: CENTRALIA · 12,182 people · 2019
1/3 SYR4
Simazine
1.42 µg/L 36%
of the EPA limit 4 µg/L
Main supplier: CENTRALIA · 12,182 people · 2019
1/3 SYR4
Atrazine
1.103 µg/L 37%
of the EPA limit 3 µg/L
Main supplier: CENTRALIA · 12,182 people · 2019
1/3 SYR4
Lead
0.0033 mg/L 22%
of the EPA limit 0.0150 mg/L
Main supplier: CENTRALIA · 12,182 people · 2025
2/3 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 Centralia

SupplierPopulation served
CENTRALIA 12,182
CLINTON COUNTY EAST PWD 1,950
CENTRALIA CORRECTIONAL SITE 1,397

Frequently asked questions about Centralia tap water

Is Centralia tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Centralia. 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 Centralia?

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

What contaminants are in Centralia's water?

The contaminants EPA monitoring detected in Centralia include Nitrate, Nitrate-Nitrite, Fluoride, Copper, TTHM. 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.