City of Columbia Utilities
Columbia, Missouri · PWSID: MO3010181
Columbia Water Quality Summary
City of Columbia Utilities supplies drinking water to about 126,254 people in Columbia, Missouri, and draws from ground water (wells or aquifers), which is naturally filtered but can carry minerals and contaminants from the surrounding geology. On the IsWaterSafe scale it earns a good Water Safety Score of 88 out of 100 (Grade B), a composite of its EPA SDWIS violation and contaminant record.
EPA SDWIS shows no health-based or monitoring violations on record for City of Columbia Utilities, though 4 enforcement actions are logged in its history.
Across the single substance sampled, none exceeded its EPA limit. Combined Filter Effluent sits highest relative to its ceiling, detected at 0.5 NTU against an MCL of 1 NTU (sampled July 2022) — within the legal limit.
The most recent documented episode is a health-based violation involving Combined Filter Effluent, beginning July 2022 and marked resolved June 2023.
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Detected Contaminants
| Contaminant | Detected Level | MCL (Limit) | Status | Sample Date |
|---|---|---|---|---|
| Combined Filter Effluent | 0.5 NTU | 1 NTU | Within Limit | Jul 1, 2022 |
Violation History
Frequently Asked Questions
City of Columbia Utilities has a Water Safety Score of B (88/100). The system serves 126,254 people and has 0 health violations on record. Check the contaminant table above for specific detected substances.
City of Columbia Utilities has 0 contaminant exceedances above EPA health guidelines. See the full contaminant detection table above for all tested substances and their levels relative to legal limits and health guidelines.
The Water Safety Score (0-100, grades A through F) is based on contaminant levels relative to legal limits, health guideline exceedances, violation history, and enforcement actions. Higher scores indicate fewer concerns.
If your water system has violations, request the Consumer Confidence Report from your utility, consider getting an independent water test from a certified lab, and look into certified water filters for specific contaminants of concern. For lead, run cold water for 30 seconds before drinking.
Water quality data sourced from EPA's Safe Drinking Water Information System (SDWIS). Safety scores are calculated based on contaminant levels, violations, and enforcement history. This is not a substitute for your utility's official Consumer Confidence Report.
Source: EPA Ground Water and Drinking Water, 2026.