§ 390. Consolidated health district; establishment. The commissioner, on the written request of the town board of any town and the board of trustees of any village and the common council or other like authority of any city, may combine into one health district, hereinafter referred to as a consolidated health district, any two or more of such towns, villages or cities and may on the written request of the town board of any town, board of trustees of any village or common council or other like authority of any city at any time thereafter set apart such town, village or city as a separate health district.