Pennsylvania is a member of eight interstate organizations and shares basins with fifteen other states. The eight organizations are:
Susquehanna River Basin Commission Delaware River Basin Commission Partnership for the Delaware Estuary Great Lakes Commission Interstate Commission on the Potomac River Basin Ohio River Valley Water Sanitation Commission
Susquehanna River Basin Commission
Delaware River Basin Commission
Partnership for the Delaware Estuary
Great Lakes Commission
Interstate Commission on the Potomac River Basin
Ohio River Valley Water Sanitation Commission