22 Basic Plumbing Principles

All premises intended for human habitation, occupancy or use shall be provided with a supply of pure and wholesome water, neither connected with unsafe water supplies nor object to hazards of backflow or back-siphonage. 

Plumbing fixtures, devices and appurtenances shall be supplied with water in sufficient volume and at pressure adequate to enable them to function satisfactorily and without undue noise under all normal conditions of use. 

Plumbing should be designed and adjusted to use the minimum quantity of water consistent with proper performance and cleaning. 

Devices for heating and storing water shall be so designed and installed as to prevent dangers from explosion through overheating. 

Every building having plumbing fixtures installed and intended for human habitation, occupancy or use on premises abutting on a street, alley or easement where there is a public sewer, shall be connected to the sewer system. 

Each family dwelling unit on premises abutting on a sewer or with a private sewage-disposal system shall have at least one water closet and one kitchen-type sink. Further, a lavatory and a bathtub or shower shall be installed to meet the basic requirement of sanitation and personal hygiene. 

Plumbing fixtures shall be made of smooth non-absorbent material, free from concealed fouling surfaces  and shall be located in ventilated enclosures. 

The drainage system shall be designed, constructed and maintained to safeguard against fouling, deposit of solids, clogging and with adequate cleanouts so arranged that the pipes may be readily cleaned. 

All pipings of plumbing systems shall be of durable NAMPAP-approved materials, free from defective workmanship, designed and constructed by Registered Master Plumbers to ensure satisfactory services. 

Each fixture directly connected to the drainage system shall be equipped with a water-sealed trap.