Safest Drinking Water in Oklahoma 2026
Oklahoma has 5 public water systems serving 1,370,955 people. The safest system is Oklahoma City in Oklahoma City with a score of 100/100.
Top 5 Water Systems in Oklahoma
| # | Water System | City | Pop. Served | Source | Violations | Score |
|---|---|---|---|---|---|---|
| 1 | Oklahoma City | Oklahoma City | 644,000 | Surface water | 0 | A (100) |
| 2 | Broken Arrow Municipal Authority | Broken Arrow | 116,330 | Surface water | 0 | B (82) |
| 3 | Tulsa | Tulsa | 413,000 | Surface water | 0 | B (80) |
| 4 | Lawton | Lawton | 92,757 | Surface water | 0 | B (80) |
| 5 | Norman Utilities Authority | Norman | 104,868 | Surface water | 1 | C (70) |
Water quality data for Oklahoma is sourced from the EPA Safe Drinking Water Information System (SDWIS), which tracks compliance for all public water systems.
Frequently Asked Questions
Oklahoma City in Oklahoma City has the highest Water Safety Score in Oklahoma at 100/100 (Grade A), serving 644,000 people.
Oklahoma has 5 public water systems serving 1,370,955 people. The average Water Safety Score is 82/100.
The Water Safety Score (0-100) is based on health violations (40%), contaminant exceedances (30%), enforcement history (20%), and monitoring violations (10%). Higher scores mean cleaner, safer water.
Water Safety Score: health violations (40%), contaminant exceedances (30%), enforcement history (20%), monitoring violations (10%).
The this entity category groups every U.S. public drinking-water safety entity sharing this attribute. The list above is the data; the paragraphs below explain what the grouping means against the broader the EPA Safe Drinking Water Information System (SDWIS) distribution and how to read the relative rankings within the category.
For readers using this category as a starting point, the per-entity detail pages linked from the table above carry the underlying the EPA Safe Drinking Water Information System (SDWIS) data in full. The category-level view is the filter; the per-entity pages are the actual answer.
Source: EPA Ground Water and Drinking Water, 2026.