Sewer overflows in Alaska
Sewer overflow record — reported spills, the worst utilities, and how often overflows reached waterways in Alaska.
Reported events
43
Total volume
495K gal
Reached waterways
0(0%)
Latest event
Jun 4, 2026
Worst utilities in Alaska
Ranked by number of reported overflow events.
| # | Utility | Events | Volume | Reached water |
|---|---|---|---|---|
| 1 | Anchorage Sanitary Sewer System | 41 | 43K gal | 0 |
| 2 | Ketchikan Sanitary Sewer System | 2 | 452K gal | 0 |
Biggest spills in Alaska
The largest single reported overflow events.
- 252K galJan 9, 2026Reached Tongass Narrows
- 200K galDec 23, 2025Reached Tongass Narrows
- 10K galMar 20, 2026
- 10K galMar 31, 2026Reached Fish Creek which flowed to Travels to Cook Inlet
- 6K galJan 30, 2026Reached Fish Creek
- 3K galDec 2, 2023
- 3K galJul 5, 2024
- 3K galDec 19, 2024
- 2K galOct 27, 2023
- 1K galMay 11, 2025