Decatur CountyPower Outage History
What this grade means
(How grades are calculated)Better than average — fewer or shorter outages than most counties. This county's outage history is better than the national median: recorded outages are less frequent and/or shorter in duration than a typical US county experienced over the same 12-year period. It isn't in the top tier nationally, but its track record points to lower-than-average outage risk.
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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Decatur County, Iowa that day.
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).
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 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.