RNPCP 22 BASIC PRINCIPLES (ans = all caps)

Sewage or other waste from a plumbing system which may be deleterious to surface or sub-surface waters shall not be discharged into the ground or into any waterway, unless first rendered innocuous through subjection to some acceptable form of treatment.

The drainage piping system shall be designed to provide adequate circulation of air free from siphonage, aspiration or forcing of trap seals under ordinary use.

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

Vent terminals shall extend to the outer air and installed to preempt clogging and the return of foul air to the building.

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 subject to hazards of backflow or back siphonage.

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

No substance which will clog the pipes, produce explosive mixture~ destroy the pipes or their joints or interfere unduly with the sewage-disposal process shall be allowed to enter the building drainage system.

Plumbing shall be installed by Registered Master Plumbers with due regard to the preservation of the strength of structural members and the prevention of damage to walls and other surfaces through fixture usage.

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.

If water closets or other plumbing fixtures are installed in buildings where there is no sewer within a reasonable distance, suitable provision shall be made for disposing of the building sewage by some accepted method of sewage treatment and disposal, such as a septic tank.