As with the other suburban municipalities, water supply and wastewater disposal became important concerns as farmland was developed into villages and towns. Several times during the 1930s, the board advised the township Council to build water mains to service streets where the population was increasing. Conflicts between existing farms, homes, and factories of the suburbs led to further action by the medical officer of health. For example, he refused a permit for a couple to start a chinchilla farm, and investigated complaints that factories were causing air or noise pollution, or contaminating waterways.
By the time Dr. Hill retired in 1965, after over 40 years on the job, North York had a full public health program.
Dr. Carl E. Hill (1922-1956)
Dr. Charles G. Johnstone (1956-1965)
Dr. Ivy R. Moody (acting, 1966)
Dr. Brian Russell (1965-1969)
Dr. G. Sweet (acting 1969-1970; appointed 1970-1976)
Dr. Agnes Marguerite Archibald (1976-1981)
Dr. Gordon K. Martin (1982-1990)
Dr. Graham L. Pollett (1991-1993)
Dr. Barbara Yaffe (1994-1997)