(A) Disposal of septic tank effluent may be by means of tile or other accepted distributing pipe laid in screened gravel or broken stone, or by means of leaching cesspools. Seepage systems shall not be located in fill placed over impervious soil.
(B) Leaching cesspools may be preferable where the amount of area is limited or where porous soil is at a greater depth than can be secured by tile fields. They are not recommended where ground water may interfere with their operation, or where soil of better seepage quality is found at shallow depth. Leaching cesspools shall not extend to rock.
('66 Code, § 57-15)