Photo by Samer Farha Back in April, the regional Environmental Protection Agency coordinator for the U.S. Department of Defense sent a letter to D.C. Water complaining about their bill. The letter identified a charge that the Department of Defense doesn’t want to pay: the impervious surface area charge, which pays for the maintenance of storm sewers that collect rainwater runoff. The Government Accountability Office backed up DOD: The entire federal government wants out of this…