Septage removal.

Where a private wastewater disposal system utilizes a cesspool or a septic tank which discharges into a public sewer system and/or other public sewers tributary thereto, unless otherwise directed by a Regional Water Engineer of NYSDEC, it shall be inspected by the permittee or his agent for scum and sludge accumulation at intervals not to exceed one year's duration, and such accumulation shall be removed by a licensed hauler at the owner's expense before the depth of either exceeds 1/4 of the liquid depth so that no settleable solids or scum will be left in the septic tank effluent.