The hospital/health system is now in its 101st year of operation. The 100th anniversary was celebrated in December 2002. The healthcare system traces its heritage to the turn of the century when its predecessor facilities, Charleroi-Monessen Hospital and Memorial Hospital of Monongahela, were founded. The two hospitals consolidated on July 1, 1972, forming what is now Monongahela Valley Hospital. The current facility in Carroll Township opened in September 1978.