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

• Principle 5

• Principle 12

• Principle 1

• Principle 9

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

• Principle 1

• Principle 10

• Principle 2

• Principle 9

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

• Principle 1

• Principle 2

• Principle 3

• Principle 4

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

• Principle 3

• Principle 4

• Principle 5

• Principle 6

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

• Principle 3

• Principle 4

• Principle 5

• Principle 6

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

• Principle 6

• Principle 7

• Principle 8

• Principle 9

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

• Principle 6

• Principle 7

• Principle 8

• Principle 9

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.

• Principle 6

• Principle 7

• Principle 8

• Principle 9

All pipings of plumbing systems shall be of durable NAMPAPAPPROVED materials, free form defective workmanship, designed and constructed by Registered Master Plumbers to ensure satisfactory service.

• Principle 6

• Principle 7

• Principle 8

• Principle 9

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

• Principle 10

• Principle 11

• Principle 12

• Principle 13