The entire drainage system for each lot and building shall be separate and independent of that of any other lot or building and shall be separately and independently vented and connected with the public sewer in the street or with a septic tank where septic tanks are permitted. Wherever it is necessary to construct a private sewer to connect to one on an adjacent street, such plans may be used as may be approved by the Board of Health, but in no case shall a joint drain be laid in cellars parallel with a street or alley.
A. 
The main house drain shall not be less than four inches in diameter and the fall shall not be less than 1/4 inch per foot. It shall be laid in a trench cut at a uniform grade, or it may be constructed along the foundation walls above the cellar, resting on nine-inch brick piers laid in cement mortar, said piers not to be more than seven feet apart, or it may be suspended from the floor by heavy iron hangers placed at intervals not greater than seven feet. The use of pipe hooks, gas pipe or iron driven into the walls for supporting drains is prohibited.
B. 
There shall be a cleanout on the main drain, directly inside of cellar walls. A Y branch is to be inserted with the side outlet of the Y to look directly upward, also at the base of vent or soil stacks on waste lines as near the basement floor as practicable.
C. 
Y branches are to be inserted and iron body brass trap screw ferrules are to be installed in the side outlets of the said Y for the purpose of cleansing. This also applies to sink drains.
A. 
All main house drains laid beneath the ground inside or outside of buildings or beneath the cellar floor shall be plain cast-iron pipe with well leaded and caulked joints.
B. 
All other drains or soil or vent pipes connected with the main drain or any of its branches underground or beneath cellar floors shall be plain cast-iron pipe.
C. 
All house drains shall be of plain cast-iron pipe with well leaded and caulked joints laid at a uniform grade of not less than 1/4 inch per foot from the point of connection to the main house drain to the curbline. If terra-cotta pipe is used between the curb and public sewer it must be increased one size. The house drain must not be less than four inches in diameter. No galvanized steel or wrought iron pipe shall be used for vent or waste lines.
Rain conductors shall not under any condition be connected with the house drain or sewer. If placed within a building, they shall be of cast-iron pipe with leaded joint and run to the curb.
Areaway and any other surface drain shall be connected to the curb. In no case will any surface or rainwater drain be permitted to connect to the sanitary sewer.
No cellar drains shall be allowed unless by special permission of the Board of Health, with a backwater valve and strainer with copper float, or iron brass cleanout plug.
A. 
When a main trap is used in the house line other than the curbline, there shall be an air inlet for fresh air entering the drain just inside the water seal of the trap. Such air inlets shall open at a convenient point just outside the foundation wall and shall have a round regulation vent cap, caulked fast to the upright iron pipe with lead.
B. 
In no case shall an air inlet open within 10 feet of any cold air intake for a heater or window shaft ventilating a basement or cellar, nor in front of doorsteps.
The arrangement of drain-, soil, waste and vent pipes shall be as direct as possible, all changes in direction on horizontal pipes shall be made with Y branches, 1/16 or 1/8 bends. When the said pipes are vertical, they shall extend in a straight line from the basement to a point at least one foot above the roof of the building; where it is impossible to maintain a straight line, offsets may be used, which must have an angle of not less than 45°. Vertical soil or waste pipes receiving the discharge of a fixture or fixtures on any floor above the first floor shall extend in full caliber at least one foot above the roof of the building, but shall not open within 10 feet of a window or shaft ventilating a living room, except that when the roof is used for purposes other than weather protection, such extensions shall not be less than five feet above the roof, and at all times the roof extensions must be run full size.
All soil, waste and vent pipes shall be located inside of new and old buildings, except in old buildings where it is deemed inadvisable, then the pipes may be placed on the outside, and the owner shall assume all responsibility therefor in writing.