Safest Drinking Water in Connecticut 2026
Connecticut has 5 public water systems serving 1,388,028 people. The safest system is Metropolitan District Commission in Hartford with a score of 95/100.
Top 5 Water Systems in Connecticut
| # | Water System | City | Pop. Served | Source | Violations | Score |
|---|---|---|---|---|---|---|
| 1 | Metropolitan District Commission | Hartford | 390,887 | Surface water | 0 | A (95) |
| 2 | Regional Water Authority | New Haven | 418,900 | Surface water | 0 | B (80) |
| 3 | Aquarion-Stamford | Shelton | 119,214 | Surface water | 0 | B (80) |
| 4 | Aquarion-Eastern Fairfield County | Shelton | 351,756 | Surface water | 0 | C (79) |
| 5 | Waterbury Water Department | Waterbury | 107,271 | Surface water | 0 | C (75) |
Water quality data for Connecticut is sourced from the EPA Safe Drinking Water Information System (SDWIS), which tracks compliance for all public water systems.
Frequently Asked Questions
Metropolitan District Commission in Hartford has the highest Water Safety Score in Connecticut at 95/100 (Grade A), serving 390,887 people.
Connecticut has 5 public water systems serving 1,388,028 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.