Columbus, OH Water Quality
Columbus, OH has 1 public water system serving 1,305,946 people. The average Water Safety Score is 40/100 (F). 3 health violations are on record.
Water Systems in Columbus
Contaminants Detected in Columbus Water
| Contaminant | Systems Detected | Exceeding MCL |
|---|---|---|
| Nitrate | 1 | 1 |
Frequently Asked Questions
Columbus has 1 public water system serving 1,305,946 people. The average Water Safety Score is 40/100. There are 3 health violations on record. Check individual systems below for details.
Columbus water systems have detected 1 contaminant, including Nitrate. 3 contaminant exceedances above EPA limits were recorded.
The Water Safety Score (0-100, grades A through F) weighs health-based violations (40%), contaminant exceedances (30%), enforcement history (20%), and monitoring violations (10%). Scores are based on EPA SDWIS data from the last 10 years.
Request your utility's Consumer Confidence Report (CCR), consider an independent water test from a certified lab, and look into NSF-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. City data aggregates all public water systems serving the municipality.
The this entity record above pulls directly from the EPA Safe Drinking Water Information System (SDWIS). What follows is the per-entity context — how this entity sits in the broader U.S. public drinking-water safety distribution and which underlying factors drive the headline numbers.
Every number on this page links back to the EPA Safe Drinking Water Information System (SDWIS); the methodology page describes the inputs, refresh cadence, and known limitations of the underlying data product.
Practical use of this page is in combination with the comparison and ranking pages elsewhere on the site, which surface the same data for this entity’s peers within U.S. public water systems. A single-entity reading without peer context can be misleading when an entity is an outlier on one axis but typical on another.
Source: EPA Ground Water and Drinking Water, 2026.