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Tap water quality report

ZIP 65231 — Columbia, MO

EPA monitoring across the 2 water suppliers serving ZIP 65231 in Columbia, MO detected 18 contaminants. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier below, with the EPA limit for each.

2
water suppliers
28,115
people served
18
contaminants found

What was found in ZIP 65231

The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Fluoride
1317 µg/L 33%
of the EPA limit 4000 µg/L
Main supplier: BOONE COUNTY PWSD 9 · 15,035 people · 2018
2/2 SYR4
Barium
133.4 µg/L 6.7%
of the EPA limit 2000 µg/L
Main supplier: BOONE COUNTY PWSD 9 · 15,035 people · 2018
Highest in the ZIP: 194.05 µg/L — CALLAWAY 2 WATER DISTRICT · 13,080 people · 2018
2/2 SYR4
Copper
165.55 µg/L 13%
of the EPA limit 1300 µg/L
Main supplier: BOONE COUNTY PWSD 9 · 15,035 people · 2018
2/2 SYR4
Lithium
43.9 µg/L
No EPA limit set
Main supplier: BOONE COUNTY PWSD 9 · 15,035 people · 2024
Highest in the ZIP: 58.4 µg/L — CALLAWAY 2 WATER DISTRICT · 13,080 people · 2024
2/2 UCMR-5
Nitrate-Nitrite
30 µg/L 0.3%
of the EPA limit 10000 µg/L
Main supplier: BOONE COUNTY PWSD 9 · 15,035 people · 2019
2/2 SYR4
Lead
13.595 µg/L 91%
of the EPA limit 15 µg/L
Main supplier: BOONE COUNTY PWSD 9 · 15,035 people · 2018
2/2 SYR4
Gross Alpha, Excl. Radon And U
7.62 pCi/L 51%
of the EPA limit 15 pCi/L
Main supplier: BOONE COUNTY PWSD 9 · 15,035 people · 2015
1/2 SYR4
TTHM
5.865 µg/L 7.3%
of the EPA limit 80 µg/L
Main supplier: BOONE COUNTY PWSD 9 · 15,035 people · 2019
Highest in the ZIP: 5.9775 µg/L — CALLAWAY 2 WATER DISTRICT · 13,080 people · 2019
2/2 SYR4
Combined Radium (-226 And -228)
3.345 pCi/L 67%
of the EPA limit 5 pCi/L
Main supplier: BOONE COUNTY PWSD 9 · 15,035 people · 2019
2/2 SYR4
Dibromochloromethane
2.458 µg/L
No EPA limit set
Main supplier: BOONE COUNTY PWSD 9 · 15,035 people · 2019
2/2 SYR4
Bromoform
1.826 µg/L
No EPA limit set
Main supplier: BOONE COUNTY PWSD 9 · 15,035 people · 2019
2/2 SYR4
Xylenes, Total
1.789 µg/L 0%
of the EPA limit 10000 µg/L
Highest in the ZIP: CALLAWAY 2 WATER DISTRICT · 13,080 people · 2018
1/2 SYR4
Bromodichloromethane
1.376 µg/L
No EPA limit set
Main supplier: BOONE COUNTY PWSD 9 · 15,035 people · 2019
Highest in the ZIP: 1.7045 µg/L — CALLAWAY 2 WATER DISTRICT · 13,080 people · 2019
2/2 SYR4
Dichloroacetic Acid
1.4 µg/L
No EPA limit set
Main supplier: BOONE COUNTY PWSD 9 · 15,035 people · 2019
1/2 SYR4
Chloroform
0.8770 µg/L
No EPA limit set
Main supplier: BOONE COUNTY PWSD 9 · 15,035 people · 2019
Highest in the ZIP: 1.1835 µg/L — CALLAWAY 2 WATER DISTRICT · 13,080 people · 2019
2/2 SYR4
Dibromoacetic Acid
1.04 µg/L
No EPA limit set
Main supplier: BOONE COUNTY PWSD 9 · 15,035 people · 2019
1/2 SYR4
Chromium
0.2400 µg/L 0.2%
of the EPA limit 100 µg/L
Highest in the ZIP: CALLAWAY 2 WATER DISTRICT · 13,080 people · 2018
1/2 SYR4
Lead
0.0028 mg/L 19%
of the EPA limit 0.0150 mg/L
Main supplier: BOONE COUNTY PWSD 9 · 15,035 people · 2025
Highest in the ZIP: 0.0045 mg/L — CALLAWAY 2 WATER DISTRICT · 13,080 people · 2023
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 95th percentile of the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.

Water suppliers serving ZIP 65231

SupplierStatePopulation served
BOONE COUNTY PWSD 9 MO 15,035
CALLAWAY 2 WATER DISTRICT MO 13,080

Frequently asked questions about ZIP 65231 tap water

Is the tap water in ZIP 65231 safe to drink?

EPA testing detected 18 contaminants across the water suppliers serving ZIP 65231. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.

Which water suppliers serve ZIP 65231?

2 public water suppliers report EPA drinking-water monitoring for ZIP 65231. Each is listed above with its population served.

What contaminants are in ZIP 65231's water?

EPA monitoring detected Fluoride, Barium, Copper, Lithium, Nitrate-Nitrite, and others across this ZIP's suppliers. The full list with levels and sources is above.