Jefferson CountyPower Outage History
What this grade means
Worse than average — more frequent or longer outages than most counties. This county's recorded history shows more frequent outages and/or longer restoration times than most US counties over the same 12-year period. If you live here, it's worth taking backup power more seriously than an average household would.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Nov 5, 2022 | 96 hrs | 18,119 (66%) | Unnamed event |
| May 27, 2025 | 2 hrs | 17,647 (65%) | Unnamed event |
| Nov 15, 2021 | 67 hrs | 11,002 (40%) | Unnamed event |
| Jun 28, 2022 | 3 hrs | 7,937 (29%) | Unnamed event |
| Dec 17, 2025 | 37 hrs | 7,495 (27%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Jefferson County, Washington that day.
Over the 7 years from 2019 to 2025, Jefferson County recorded 374 distinct power outage events, averaging 4.8 hours per event.
The single worst outage on record in Jefferson County started November 5, 2022, lasting 96 hours and leaving up to 18,119 customers without power (66% of the county) at its peak.
January has historically been the worst month for outages in Jefferson County, with 49 events recorded during that month across the dataset.
Based on this history, Jefferson County earns a Reliability Grade of D, placing it in the 34th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Washington
Counties with the closest reliability grade and national percentile to Jefferson County.
| County | Grade | National percentile |
|---|---|---|
| Thurston County | D | 33rd |
| Garfield County | D | 32nd |
| Kittitas County | D | 31st |
| Clallam County | D | 38th |
| King County | D | 28th |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
FAQ
How often does power go out in Jefferson County?
Between 2019 and 2025, Jefferson County recorded 374 outage events, averaging 4.8 hours each.
What is Jefferson County's reliability grade?
Jefferson County has a Reliability Grade of D, in the 34th national percentile.
What was the worst power outage in Jefferson County?
The worst outage on record started November 5, 2022, lasting 96 hours and affecting up to 18,119 customers.