Underground pipe installations must use which of the following according to plumbing code?

Underground pipe installations must use which of the following according to plumbing code?

• A. Copper pipes are always acceptable.
• B. PVC pipes are prohibited.
• C. Acceptable pipes for underground supply per plumbing code.
• D. Only metal pipes may be used underground.

Answer: (C)

Underground pipe installations must use materials that the plumbing code approves for underground water supply. The code sets which materials are listed and permitted for buried service, and installations must follow those listings and the code’s requirements. That’s why the best answer is that you use acceptable pipes for underground supply per the plumbing code—it recognizes that multiple materials may be allowed as long as they’re listed and installed correctly for underground use. Copper, PVC, CPVC, ductile iron, HDPE, and other materials may be permitted in different jurisdictions, so nothing in the code says “only metal” or “PVC is prohibited” or that copper is always acceptable. Always check the local plumbing code and the authority having jurisdiction for the specific materials allowed and any burial or protection requirements.

Underground pipe installations must use materials that the plumbing code approves for underground water supply. The code sets which materials are listed and permitted for buried service, and installations must follow those listings and the code’s requirements. That’s why the best answer is that you use acceptable pipes for underground supply per the plumbing code—it recognizes that multiple materials may be allowed as long as they’re listed and installed correctly for underground use.

Copper, PVC, CPVC, ductile iron, HDPE, and other materials may be permitted in different jurisdictions, so nothing in the code says “only metal” or “PVC is prohibited” or that copper is always acceptable. Always check the local plumbing code and the authority having jurisdiction for the specific materials allowed and any burial or protection requirements.