Columbia Energy Center is located in Pardeeville, Wisconsin.

The CCR units and regulatory designation of units at Columbia are below. Modules 1-3 were previously described as separate existing CCR landfills although they are contiguous and are managed as a single landfill by the facility and by the Wisconsin Department of Natural Resources.

  • COL Primary Ash Pond (existing surface impoundment)
  • COL Secondary Pond (inactive surface impoundment)
  • COL Dry Ash Disposal Facility - Modules 1 - 3 (existing landfill)
  • COL Dry Ash Disposal Facility – Module 4 (new landfill)