Decatur CountyPower Outage History
2014–2025 · Iowa
Better than average — fewer or shorter outages than most counties.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Sep 20, 2019 | 2 hrs | 1,885 (48%) | Heavy Rain |
| May 7, 2024 | 8 hrs | 908 (23%) | Hail |
| Nov 26, 2015 | 2 hrs | 742 (19%) | Unnamed event |
| Mar 14, 2018 | 2 hrs | 733 (19%) | Unnamed event |
| Jun 28, 2018 | 2 hrs | 674 (17%) | Unnamed event |
Over the 12 years from 2014 to 2025, Decatur County recorded 369 distinct power outage events, averaging 2.5 hours per event.
The single worst outage on record in Decatur County started September 20, 2019 (Heavy Rain), lasting 2 hours and leaving up to 1,885 customers without power (48% of the county) at its peak.
June has historically been the worst month for outages in Decatur County, with 56 events recorded during that month across the dataset.
Based on this history, Decatur County earns a Reliability Grade of B, placing it in the 79th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Decatur County's outage profile
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Outage-prep kit
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Similar counties in Iowa
Counties with the closest reliability grade and national percentile to Decatur County.
| County | Grade | National percentile |
|---|---|---|
| O'Brien County | B | 79th |
| Warren County | B | 79th |
| Hamilton County | B | 80th |
| Crawford County | B | 79th |
| Cerro Gordo County | A | 80th |
Most reliable counties in Iowa
The top 3 counties in Iowa by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Clay County | A | 97th |
| Emmet County | A | 95th |
| Bremer County | A | 94th |
Least reliable counties in Iowa
The bottom 3 counties in Iowa by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Marshall County | F | 6th |
| Tama County | F | 12th |
| Jasper County | F | 14th |
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 Decatur County?
Between 2014 and 2025, Decatur County recorded 369 outage events, averaging 2.5 hours each.
What is Decatur County's reliability grade?
Decatur County has a Reliability Grade of B, in the 79th national percentile.
What was the worst power outage in Decatur County?
The worst outage on record started September 20, 2019 (Heavy Rain), lasting 2 hours and affecting up to 1,885 customers.