Within the public system of mental health, developmental disabilities, and substance abuse services, there are area, county, and State facilities. An area authority or county program is the locus of coordination among public services for clients of its catchment area. (1985, c. 589, s. 2; 1989, c. 625, s. 13; 1993, c. 396, s. 3; 2001-437, s. 1.4.)