Alaska Water Quality
Drinking water data for all 30 counties.
Avg Water Score
19.8
State Grade
F
Counties with Data
22
of 30 total
Best Water Quality
All Alaska Counties
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Frequently Asked Questions
Which county in Alaska has the best water quality?
Yakutat City and Borough has the highest water quality score in Alaska at 86.0/100 (Grade: A), based on EPA SDWIS data.
Which county in Alaska has the most water violations?
Yukon-Koyukuk Census Area has among the lowest water quality scores in Alaska at 0.3/100. See the individual county page for detailed violation history.
Is the tap water safe to drink in Alaska?
Alaska has an average water quality score of 19.8/100 based on EPA Safe Drinking Water Act compliance data. Individual county scores vary — check your specific county's page for detailed information.
What contaminants are found in Alaska water supplies?
Drinking water quality varies by county and water system. The EPA Safe Drinking Water Information System (SDWIS) tracks violations for contaminants like lead, nitrates, bacteria, and disinfection byproducts. See individual county pages for specific contaminant and violation history.
Data Source
Water quality data sourced from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.
Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.