Tap WaterIndex

← Missouri

Tap water quality report

City of Columbia Utilities

EPA monitoring tested this supplier for 98 contaminants and detected 18. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

98
contaminants tested
18
detected
126,254
people served
3
health-based violations
Missouri rankingsLead in MissouriPFAS in Missouri
Water source
Ground water
Ownership
Local government
Counties served
Boone

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

3
health-based violations
9
violations on file
2
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2008-04-01 → 2008-06-30
MCL Health-based Resolved 2008-01-01 → 2008-03-31
MCL Health-based Resolved 2007-10-01 → 2007-12-31
RPT Monitoring Unaddressed 2025-07-02
RPT Monitoring Unaddressed 2025-07-02
MR Monitoring Resolved 2022-07-01
MR Monitoring Resolved 2022-07-01
MR Monitoring Resolved 2022-07-01
MR Monitoring Resolved 2022-07-01

Other contaminants detected

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 this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Bromodichloromethane
20.355 µg/L
No EPA limit set
worst single sample: 29.8 µg/L
190/190 SYR4 2012–2019
Bromoform
3.102 µg/L
No EPA limit set
worst single sample: 3.84 µg/L
190/190 SYR4 2012–2019
Chloroform
25.81 µg/L
No EPA limit set
worst single sample: 43.4 µg/L
190/190 SYR4 2012–2019
Dibromochloromethane
15.135 µg/L
No EPA limit set
worst single sample: 20.9 µg/L
190/190 SYR4 2012–2019
TTHM
62.43 µg/L 78%
of the EPA limit 80 µg/L
worst single sample: 97.9 µg/L
187/187 SYR4 2012–2019
Trichloroacetic Acid
5.885 µg/L
No EPA limit set
worst single sample: 9.98 µg/L
186/187 SYR4 2012–2019
Dibromoacetic Acid
4.552 µg/L
No EPA limit set
worst single sample: 6.27 µg/L
185/187 SYR4 2012–2019
Dichloroacetic Acid
14.16 µg/L
No EPA limit set
worst single sample: 21 µg/L
185/187 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
29.86 µg/L 50%
of the EPA limit 60 µg/L
worst single sample: 40.8 µg/L
177/187 SYR4 2012–2019
Copper
89.62 µg/L 6.9%
of the EPA limit 1300 µg/L
worst single sample: 234 µg/L
153/153 SYR4 2012–2019
Monobromoacetic Acid
12.6 µg/L
No EPA limit set
worst single sample: 15 µg/L
71/187 SYR4 2012–2019
Lead
6.945 µg/L 46%
of the EPA limit 15 µg/L
worst single sample: 36.3 µg/L
51/153 SYR4 2012–2019
Lead
0.0021 mg/L 14%
of the EPA limit 0.0150 mg/L
 18/18 LCR 2025
Nitrate-Nitrite
37 µg/L 0.4%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Chromium
1.78 µg/L 1.8%
of the EPA limit 100 µg/L
worst single sample: 1.82 µg/L
5/5 SYR4 2012–2018
Barium
122.5 µg/L 6.1%
of the EPA limit 2000 µg/L
worst single sample: 123 µg/L
3/3 SYR4 2012–2018
Fluoride
631 µg/L 16%
of the EPA limit 4000 µg/L
worst single sample: 640 µg/L
3/3 SYR4 2012–2018
Lithium
21.4 µg/L
No EPA limit set
 2/2 UCMR-5 2024
80 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
ANDERSON, ALLISON
Phone
573-874-7264

Frequently asked questions about City of Columbia Utilities

Is City of Columbia Utilities tap water safe to drink?

EPA monitoring detected 18 contaminants in City of Columbia Utilities's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in City of Columbia Utilities's water?

EPA monitoring detected Bromodichloromethane, Bromoform, Chloroform, Dibromochloromethane, TTHM, and others. The full list with the level and data source for each is above.

How many people does City of Columbia Utilities serve?

City of Columbia Utilities reports serving 126,254 people in Missouri, per its EPA record.

Has City of Columbia Utilities had any water quality violations?

The EPA has 9 violations on file for City of Columbia Utilities, of which 3 are health-based (a contaminant limit or required treatment was breached) and 2 remain open. The rest are monitoring or reporting failures.

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.