TAHLEQUAH â Access to clean water and proper management of wastewater have been priorities of the Cherokee Nation for decades. The CN pursues its water objectives though a number of channels and methods, and among the most direct is its Sanitation Facilities Construction program through the Office of Environmental Health and Engineering. âThe Cherokee Nation Office of Environmental Health and Engineering administers the Sanitation Facilities Construction program authorized by Public Law 94-437 as part of our self-governance agreement with the Indian Health Service,â said Billy ...