What was found in ZIP 65201
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.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 37 µg/L 0.4% of the EPA limit 10000 µg/L Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2019
Highest in the ZIP: 6779 µg/L — CLARK COUNTY CONS PWSD 1 · 7,140 people · 2019 | 4/5 | SYR4 |
| Fluoride | 631 µg/L 16% of the EPA limit 4000 µg/L Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2018
Highest in the ZIP: 1515 µg/L — BOONE COUNTY CONS PWSD 1 · 24,700 people · 2018 | 4/5 | SYR4 |
| Copper | 89.62 µg/L 6.9% of the EPA limit 1300 µg/L Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2019
Highest in the ZIP: 863.25 µg/L — THOMAS HILL PWSD 1 · 11,250 people · 2018 | 5/5 | SYR4 |
| Barium | 122.5 µg/L 6.1% of the EPA limit 2000 µg/L Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2018
Highest in the ZIP: 187.7 µg/L — BOONE COUNTY CONS PWSD 1 · 24,700 people · 2018 | 4/5 | SYR4 |
| TTHM | 62.43 µg/L 78% of the EPA limit 80 µg/L Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2019
Highest in the ZIP: 70.265 µg/L — THOMAS HILL PWSD 1 · 11,250 people · 2019 | 5/5 | SYR4 |
| Lithium | 21.4 µg/L No EPA limit set Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2024
Highest in the ZIP: 68.8 µg/L — BOONE COUNTY CONS PWSD 1 · 24,700 people · 2024 | 3/5 | UCMR-5 |
| Chloroform | 25.81 µg/L No EPA limit set Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2019
Highest in the ZIP: 59.3 µg/L — THOMAS HILL PWSD 1 · 11,250 people · 2019 | 5/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 29.86 µg/L 50% of the EPA limit 60 µg/L Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2019
Highest in the ZIP: 54.9 µg/L — THOMAS HILL PWSD 1 · 11,250 people · 2019 | 2/5 | SYR4 |
| Dichloroacetic Acid | 14.16 µg/L No EPA limit set Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2019
Highest in the ZIP: 33.435 µg/L — THOMAS HILL PWSD 1 · 11,250 people · 2019 | 5/5 | SYR4 |
| Bromodichloromethane | 20.355 µg/L No EPA limit set Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2019 | 5/5 | SYR4 |
| Trichloroacetic Acid | 5.885 µg/L No EPA limit set Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2019
Highest in the ZIP: 19.76 µg/L — THOMAS HILL PWSD 1 · 11,250 people · 2019 | 4/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 17 pCi/L 113% of the EPA limit, at the 95th percentile of samples — 15 pCi/L Highest in the ZIP: BOONE COUNTY CONS PWSD 1 · 24,700 people · 2018 | 2/5 | SYR4 |
| Lead | 6.945 µg/L 46% of the EPA limit 15 µg/L Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2019
Highest in the ZIP: 15.66 µg/L — THOMAS HILL PWSD 1 · 11,250 people · 2018 | 5/5 | SYR4 |
| Dibromochloromethane | 15.135 µg/L No EPA limit set Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2019 | 5/5 | SYR4 |
| Monobromoacetic Acid | 12.6 µg/L No EPA limit set Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2019 | 3/5 | SYR4 |
| Chromium | 1.78 µg/L 1.8% of the EPA limit 100 µg/L Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2018
Highest in the ZIP: 6.236 µg/L — BOONE COUNTY CONS PWSD 1 · 24,700 people · 2018 | 3/5 | SYR4 |
| Dibromoacetic Acid | 4.552 µg/L No EPA limit set Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2019 | 5/5 | SYR4 |
| Combined Radium (-226 And -228) | 3.44 pCi/L 69% of the EPA limit 5 pCi/L Highest in the ZIP: BOONE COUNTY CONS PWSD 1 · 24,700 people · 2018 | 2/5 | SYR4 |
| Bromoform | 3.102 µg/L No EPA limit set Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2019
Highest in the ZIP: 3.366 µg/L — BOONE COUNTY CONS PWSD 1 · 24,700 people · 2019 | 4/5 | SYR4 |
| Combined Uranium | 1.1 µg/L 3.7% of the EPA limit 30 µg/L Highest in the ZIP: BOONE COUNTY CONS PWSD 1 · 24,700 people · 2018 | 1/5 | SYR4 |
| Dichloromethane | 0.6200 µg/L 12% of the EPA limit 5 µg/L Highest in the ZIP: BOONE COUNTY CONS PWSD 1 · 24,700 people · 2018 | 1/5 | SYR4 |
| Pfba | 0.0093 µg/L No EPA limit set Highest in the ZIP: THOMAS HILL PWSD 1 · 11,250 people · 2025 | 1/5 | UCMR-5 |
| Lead | 0.0021 mg/L 14% of the EPA limit 0.0150 mg/L Main supplier: CITY OF COLUMBIA UTILITIES · 126,254 people · 2025
Highest in the ZIP: 0.0035 mg/L — BOONE COUNTY CONS PWSD 1 · 24,700 people · 2024 | 5/5 | 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 65201
| Supplier | State | Population served |
|---|---|---|
| CITY OF COLUMBIA UTILITIES | MO | 126,254 |
| BOONE COUNTY CONS PWSD 1 | MO | 24,700 |
| BOONE COUNTY PWSD 9 | MO | 15,035 |
| THOMAS HILL PWSD 1 | MO | 11,250 |
| CLARK COUNTY CONS PWSD 1 | MO | 7,140 |
Frequently asked questions about ZIP 65201 tap water
Is the tap water in ZIP 65201 safe to drink?
EPA testing detected 23 contaminants across the water suppliers serving ZIP 65201. 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 65201?
5 public water suppliers report EPA drinking-water monitoring for ZIP 65201. Each is listed above with its population served.
What contaminants are in ZIP 65201's water?
EPA monitoring detected Nitrate-Nitrite, Fluoride, Copper, Barium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.