A. No person shall deposit or permit to be deposited in the city sewer, without previous treatment, any waste materials which will injuriously affect the treatment of sewage, or which will injure or damage the sewers into which they may be discharged, or which do not yield readily to treatment by processes employed in the sewage treatment works or which may produce conditions dangerous or prejudicial to sanitation or health. The process or processes employed in such previous treatment must in each case be satisfactory to the state Board of Health and shall have written approval of the board.

B. No person shall deposit any wash or waste water or liquid or solid filth or sewage, or permit such matter to be deposited upon any premises owned, occupied, or under his control, or upon the ground, or in any hole or vault in the ground, except a cesspool or septic tank which has been approved by the plumbing inspector; provided, that when, upon inspection, the plumbing inspector finds any such septic tank or cesspool to be defective, he shall give notice to repair or replace the defective septic tank or cesspool. Such repair or replacement shall be done within thirty days after the notice has been received and shall be done as directed by the plumbing inspector and subject to his approval.