| | Site | License number | Start date | Title | Topic |
|---|
| ENS 50924 | Cooper | | 25 March 2015 22:19:00 | Offsite Notification Due to Effluent Below National Pollutant Discharge Elimination System Ph Limits | |
| ENS 46970 | Cooper | | 20 June 2011 00:40:00 | Release of Oil to the Missouri River | |
| ENS 46941 | Cooper | | 9 June 2011 14:20:00 | Offsite Notification Concerning Inability to Meet Sludge Pond Discharge Permit Due to River Levels | |
| ENS 46756 | Cooper | | 14 April 2011 21:25:00 | Offsite Notification to Nebraska Department of Environmental Quality | |
| ENS 46017 | Cooper | | 16 June 2010 17:33:00 | Offsite Notification to the Nebraska Department of Environmental Quality | |
| ENS 45251 | Fort Calhoun | | 9 August 2009 09:00:00 | State of Nebraska Notified Due to Minor Sewage Spill to the Missouri River | |
| ENS 44655 | Fort Calhoun | | 13 November 2008 06:20:00 | Oil Spill from Circulating Water Pump Oil Sight Glass Line | |
| ENS 43575 | Fort Calhoun | | 17 August 2007 15:53:00 | Offsite Notification Performed Due to External Environmental Event | |
| ENS 43347 | Fort Calhoun | | 5 May 2007 17:10:00 | Offsite Notification Made to the State of Nebraska Due to a Small Oil Spill | |
| ENS 40262 | Cooper | | 20 October 2003 20:26:00 | Offsite Notification to Nebraska Department of Environmental Quality | |