(A) Whenever the Enforcement Officer determines that there are reasonable grounds to believe that there has been a violation of any provision of this chapter which affects the health of the occupants of any dwelling, dwelling unit or rooming unit or the health of the general public, he shall give notice of such alleged violation to the person responsible therefor, and to any known agent of such person, as hereinafter provided.
(B) Such notice shall be in writing, include a statement of the reasons why it is being issued and allow a reasonable time for the performance of any act it requires.
(C) The notice required by this section shall be served on the owner or his agent, or the occupant, on the premises in violation as the case may require, provided that such notice shall be deemed to be properly served on such owner or agent, or on such occupant, if a copy thereof is served on him personally, or if a copy thereof is sent by certified mail to his last known address, or if a copy thereof is posted in a conspicuous place in or about the dwelling affected by the notice, or if he is served with such notice by any other method authorized or required under the laws of this state.
('75 Code, § 13-5)