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Tap water quality report

St. Clair, MO

EPA monitoring detected 11 contaminants across the 2 water suppliers serving St. Clair. 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
4,950
people served
11
contaminants found
Missouri rankings Lead in Missouri PFAS in Missouri

What was found in St. Clair'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-Nitrite
510 µg/L 5.1%
of the EPA limit 10000 µg/L
Main supplier: ST CLAIR PWS · 4,700 people · 2019
2/2 SYR4
Barium
218.75 µg/L 11%
of the EPA limit 2000 µg/L
Main supplier: ST CLAIR PWS · 4,700 people · 2017
Highest in the city: 360.15 µg/L — VILLAGE GREENS · 250 people · 2017
2/2 SYR4
Fluoride
256.5 µg/L 6.4%
of the EPA limit 4000 µg/L
Main supplier: ST CLAIR PWS · 4,700 people · 2017
2/2 SYR4
Copper
131.95000000000005 µg/L 10%
of the EPA limit 1300 µg/L
Main supplier: ST CLAIR PWS · 4,700 people · 2017
2/2 SYR4
Lead
5.4729999999999945 µg/L 36%
of the EPA limit 15 µg/L
Main supplier: ST CLAIR PWS · 4,700 people · 2017
Highest in the city: 9.808 µg/L — VILLAGE GREENS · 250 people · 2018
2/2 SYR4
Chromium
1.452 µg/L 1.5%
of the EPA limit 100 µg/L
Main supplier: ST CLAIR PWS · 4,700 people · 2017
Highest in the city: 5.92 µg/L — VILLAGE GREENS · 250 people · 2017
2/2 SYR4
Combined Radium (-226 And -228)
2.5 pCi/L 50%
of the EPA limit 5 pCi/L
Main supplier: ST CLAIR PWS · 4,700 people · 2017
1/2 SYR4
Arsenic
1.98 µg/L 20%
of the EPA limit 10 µg/L
Main supplier: ST CLAIR PWS · 4,700 people · 2017
1/2 SYR4
Cadmium
0.2595 µg/L 5.2%
of the EPA limit 5 µg/L
Highest in the city: VILLAGE GREENS · 250 people · 2017
1/2 SYR4
Lead
0.0024 mg/L 16%
of the EPA limit 0.0150 mg/L
Main supplier: ST CLAIR PWS · 4,700 people · 2025
Highest in the city: 0.0098 mg/L — VILLAGE GREENS · 250 people · 2024
2/2 LCR
PFHXS
0.0056 µg/L
No EPA limit set
Main supplier: ST CLAIR PWS · 4,700 people · 2024
1/2 UCMR-5
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 St. Clair

SupplierPopulation served
ST CLAIR PWS 4,700
VILLAGE GREENS 250

Frequently asked questions about St. Clair tap water

Is St. Clair tap water safe to drink?

EPA testing detected 11 contaminants in the water serving St. Clair. 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 St. Clair?

2 public water suppliers report drinking-water monitoring for St. Clair, Missouri to the EPA. Each is listed above with its population served.

What contaminants are in St. Clair's water?

The contaminants EPA monitoring detected in St. Clair include Nitrate-Nitrite, Barium, Fluoride, Copper, Lead. 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.