Safest Drinking Water in Washington 2026
Washington has 5 public water systems serving 1,062,860 people. The safest system is Bellevue City Of in Bellevue with a score of 100/100.
Top 5 Water Systems in Washington
| # | Water System | City | Pop. Served | Source | Violations | Score |
|---|---|---|---|---|---|---|
| 1 | Bellevue City Of | Bellevue | 317,330 | Surface water | 0 | A (100) |
| 2 | Alderwood Water District | Lynnwood | 200,000 | Surface water | 0 | A (100) |
| 3 | Redmond Water System City Of | Redmond | 163,335 | Surface water | 0 | A (100) |
| 4 | Kent Water Department | Kent | 166,421 | Surface water | 0 | A (97) |
| 5 | Everett Public Works Dept. City Of | Everett | 215,774 | Surface water | 0 | A (91) |
Water quality data for Washington is sourced from the EPA Safe Drinking Water Information System (SDWIS), which tracks compliance for all public water systems.
Frequently Asked Questions
Bellevue City Of in Bellevue has the highest Water Safety Score in Washington at 100/100 (Grade A), serving 317,330 people.
Washington has 5 public water systems serving 1,062,860 people. The average Water Safety Score is 98/100.
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%).