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Tap water quality report

Chesterfield, MO

EPA monitoring detected 34 contaminants across the 2 water suppliers serving Chesterfield. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

2
water suppliers
1,111,343
people served
34
contaminants found
Missouri rankings Lead in Missouri PFAS in Missouri

What was found in Chesterfield'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
3450 µg/L 35%
of the EPA limit 10000 µg/L
 2/2 SYR4
Nitrate-Nitrite
3450 µg/L 35%
of the EPA limit 10000 µg/L
 2/2 SYR4
Copper
916 µg/L 70%
of the EPA limit 1300 µg/L
 2/2 SYR4
Fluoride
800 µg/L 20%
of the EPA limit 4000 µg/L
 2/2 SYR4
Barium
138 µg/L 6.9%
of the EPA limit 2000 µg/L
 2/2 SYR4
Nitrite
100 µg/L 10%
of the EPA limit 1000 µg/L
 1/2 SYR4
TTHM
99.9 µg/L 125%
of the EPA limit, in the worst sample — 80 µg/L
 2/2 SYR4
Chloroform
96.5 µg/L
No EPA limit set
 2/2 SYR4
Lithium
86.8 µg/L
No EPA limit set
 1/2 UCMR-5
Total Haloacetic Acids (HAA5)
54.3 µg/L 90%
of the EPA limit 60 µg/L
 2/2 SYR4
Dichloroacetic Acid
44.7 µg/L
No EPA limit set
 2/2 SYR4
Dibromochloromethane
20.1 µg/L
No EPA limit set
 2/2 SYR4
Bromodichloromethane
16.7 µg/L
No EPA limit set
 2/2 SYR4
Bromoform
13.4 µg/L
No EPA limit set
 2/2 SYR4
Lead
10 µg/L 67%
of the EPA limit 15 µg/L
 2/2 SYR4
Chromium
7.87 µg/L 7.9%
of the EPA limit 100 µg/L
 2/2 SYR4
Trichloroacetic Acid
7.8 µg/L
No EPA limit set
 2/2 SYR4
Monobromoacetic Acid
6.6 µg/L
No EPA limit set
 1/2 SYR4
Dibromoacetic Acid
6.24 µg/L
No EPA limit set
 2/2 SYR4
Monochloroacetic Acid
4.7 µg/L
No EPA limit set
 1/2 SYR4
Selenium
3 µg/L 6%
of the EPA limit 50 µg/L
 1/2 SYR4
Arsenic
1.74 µg/L 17%
of the EPA limit 10 µg/L
 1/2 SYR4
Dichloromethane
1.1 µg/L 22%
of the EPA limit 5 µg/L
 1/2 SYR4
Di(2-ethylhexyl) Phthalate
1.1 µg/L 18%
of the EPA limit 6 µg/L
 1/2 SYR4
Atrazine
0.7000 µg/L 23%
of the EPA limit 3 µg/L
 1/2 SYR4
Diquat
0.6000 µg/L 3%
of the EPA limit 20 µg/L
 1/2 SYR4
2,4-D
0.5000 µg/L 0.7%
of the EPA limit 70 µg/L
 1/2 SYR4
Antimony, Total
0.5000 µg/L 8.3%
of the EPA limit 6 µg/L
 1/2 SYR4
Picloram
0.2000 µg/L 0%
of the EPA limit 500 µg/L
 1/2 SYR4
Hexachlorocyclopentadiene
0.1000 µg/L 0.2%
of the EPA limit 50 µg/L
 1/2 SYR4
Benzo(A)Pyrene
0.0400 µg/L 20%
of the EPA limit 0.2000 µg/L
 1/2 SYR4
Ethylene Dibromide
0.0200 µg/L 40%
of the EPA limit 0.0500 µg/L
 1/2 SYR4
Pfba
0.0051 µg/L
No EPA limit set
 1/2 UCMR-5
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
 2/2 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 Chesterfield

SupplierPopulation served
MO AMERICAN ST LOUIS ST CHARLES COUNTIES 1,111,000
MO AMERICAN PEVELY FARMS 343

Frequently asked questions about Chesterfield tap water

Is Chesterfield tap water safe to drink?

EPA testing detected 34 contaminants in the water serving Chesterfield. 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 Chesterfield?

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

What contaminants are in Chesterfield's water?

The contaminants EPA monitoring detected in Chesterfield 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.