Water quality for ZIP code 99546
ZIP 99546 covers Adak in Aleutians West Census Area, Alaska, one of 7 ZIP codes in the county. 8 active public water systems serve the county; 7 had an EPA violation in the past three years.
Most likely your provider
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in Aleutians West Census Area
5 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Atka |
50 | 7 | 106.7 mi | |
| Nikolski Village Nikolski |
34 | 3 | 342.9 mi | |
| Saint George Water System Saint George |
65 | 7 | 433.3 mi | |
| Unalaska Water System Unalaska |
9,400 | 6 | 444.1 mi | |
| Saint Paul Water System Saint Paul |
380 | 7 | 450.8 mi |
Non-community systems in Aleutians West Census Area (2: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Offshore Systems, Dutch Harbor Unalaska |
535 | 0 | 0 | |
|
Usaf Eareckson Shemya Stations |
120 | 1 | 0 |
About this data
Water systems are matched to Aleutians West Census Area, the county this ZIP code lies in, nearest to the ZIP code's centre first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Alaska records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.