All premises intended for human habitation shall be provided with a supply of pure and wholesome water.

Plumbing fixtures, devices, and appurtenances shall be supplied with water in sufficient volume and adequate pressure.

Plumbing shall 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, where there is a public sewer, shall be connected to the sewer system.

Each family dwelling unit shall have at least 1 water closet and 1 kitchen-type sink; lavatory and bathtub or shower.

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

The drainage system shall be designed, constructed and maintained, and provided with adequate cleanouts.

All pipings of plumbing systems shall be of durable NAMPAP-approved materials.

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

The drainage piping system shall be designed to provide adequate circulation of air.

Vent terminals shall extend to the outer air

Plumbing systems shall be subjected to such tests to effectively disclose all leaks and defects in the workmanship.

No substance which will clog or destroy the pipes shall be allowed

Proper protection shall be provided to prevent contamination

No water closet shall be located in a room which is not properly ventilated and lighted

Suitable provision shall be made for disposing of building sewage if there is no available sewer

Suitable provision shall be made to prevent from backflow of sewage

Plumbing systems shall be maintained by Registered Master Plumbers

All plumbing fixtures must be properly spaced

Plumbing shall be installed with due regard to preservation of strength and prevention of damage of other structural members.

Sewage that are deleterious shall not be discharged into the ground or into any waterway

Act in an unprofessional manner and demand any remuneration other than his/her original charges except for additional services not covered in the basic contract.

Supplant another Registered Master Plumber after definite steps have already been taken toward his/her being commissioned to perform the contract.

Underbid another Registered Master Plumber by reducing his/her professional fees after being informed of the fees charged by the other Registered Master Plumber.

Take the advantage of a salaried government position to compete unfairly with a practicing Registered Master Plumber.

Allow the use of his/her License as Registered Master Plumber for a fee to an unlicensed Master Plumber in plumbing works without his/her personal supervision.

Injure falsely or maliciously, directly of indirectly, the reputation of another Registered Master Plumber by reviewing his/her work for the same client unless the professional services of the former have been officially terminated and all professional fees have been fully paid by the client.

Advertise in self-laudatory language, act in any manner and engage in any practice which tend to bring dishonor to the dignity of the Registered Master Plumber, the National Master Plumbers Association of the Philippines (NAMPAP) and the plumbing profession.