Section 47a-54c - Toilets and bathrooms(a) Each building used as a tenement, lodging or boarding house shall be furnished with adequate and suitable privy vaults or water closets. There shall be at least one such water closet or vault for each two dwelling units or apartments of two rooms or less each, and one such water closet or vault for each dwelling unit or apartment of three or more rooms. Each tenement, boarding or lodging house located on premises abutting on any street or alley where running water is available and through which there is a sewer with which connection may be had shall be provided with water closets connected with such sewer, and each such water closet shall be located on the same floor as the dwelling unit or apartment which it serves.(b) Each bathroom or water closet compartment in a tenement, lodging or boarding house shall be ventilated by a freely opening window of at least three square feet in area, opening to the outer air or upon a vent shaft having such openings at the bottom and top as meet the approval of the board of health, or by a separate ventilating flue of noncorroding material and at least thirty-six square inches in area, leading directly to the roof.(c) Each such bathroom or water closet compartment, not otherwise sufficiently lighted, shall be provided with light from an adjoining room or rooms by means of translucent glass, of adequate size, in a fixed sash.Conn. Gen. Stat. § 47a-54c