Mason County Power Outage History
2019–2025 · Washington
Average — typical outage frequency and duration nationally. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jan 13, 2021 | 21 hrs | 23,192 (59%) | Flood |
| Dec 18, 2024 | 20 hrs | 9,672 (25%) | Unnamed event |
| Sep 7, 2020 | 6 hrs | 6,681 (17%) | Unnamed event |
| Jul 17, 2025 | 7 hrs | 5,707 (14%) | Unnamed event |
| Jan 14, 2022 | 4 hrs | 5,450 (14%) | Unnamed event |
Over the 7 years from 2019 to 2025, Mason County recorded 419 distinct power outage events, averaging 2.9 hours per event.
The single worst outage on record in Mason County started January 13, 2021 (Flood), lasting 21 hours and leaving up to 23,192 customers without power (59% of the county) at its peak.
November has historically been the worst month for outages in Mason County, with 66 events recorded during that month across the dataset.
Based on this history, Mason County earns a Reliability Grade of C, placing it in the 55th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Washington
Counties with the closest reliability grade and national percentile to Mason County.
| County | Grade | National percentile |
|---|---|---|
| Lewis County | C | 59th |
| Pend Oreille County | C | 51st |
| Columbia County | B | 63rd |
| Pierce County | C | 46th |
| Spokane County | B | 69th |
FAQ
How often does power go out in Mason County?
Between 2019 and 2025, Mason County recorded 419 outage events, averaging 2.9 hours each.
What is Mason County's reliability grade?
Mason County has a Reliability Grade of C, in the 55th national percentile.
What was the worst power outage in Mason County?
The worst outage on record started January 13, 2021 (Flood), lasting 21 hours and affecting up to 23,192 customers.