The City of St. Marys Landfill closed June 1, 1998. The Landfill must be maintained for a minimum of 30 years after closure. This was official in 2005. The post closure monitoring requirements include groundwater, explosive gas, and leachate monitoring. Additional environmental work performed at the Landfill includes monitoring of the St. Marys River and environmental investigations when needed.
Maintenance on the closed facility includes maintaining the ditch and surface water improvements, erosion control, maintenance of access roads, mowing, maintaining the leachate collection system, and clay cap.