Conn. Agencies Regs. § 19-13-B53
(k) Privies shall be of fly and vermin-proof construction and shall consist of a pit at least three feet deep and constructed so as to exclude surface water. Cracks shall be battened and openings shall be screened with sixteen mesh wire screening. The door shall be well fitted to exclude flies and shall close automatically by means of a spring or spring hinges. Seat covers shall be hinged and shall be so constructed that they drop automatically into place when the seat is not occupied.
(l) Privies shall be adequately lighted and ventilated.