The original order alleged that 2 of Range's Barnett Shale gas wells contaminated private wells located in Parker County, Texas, with methane.
Range has been fighting with the EPA before the Texas Railroad Commission in federal court and in the fifth circuit court of appeals over the EPA's emergency orders.
The Texas Railroad Commission ruled in 2011 that Range wasn't responsible for the methane contamination.
Read EPA's letter to Range along with the dismissal filing.
