The minimum size water service pipe shall be _____ inch.

The minimum size water service pipe shall be _____ inch.

• A. 1 inch
• B. 1/2 inch
• C. 3/4 inch
• D. 1 1/4 inch

Answer: (C)

In plumbing supply, the service pipe that brings water from the main into a building must be large enough to deliver adequate flow and maintain reasonable pressure for typical uses. The minimum size that reliably serves a residence is three quarters of an inch. A smaller size, like half an inch, would cause a noticeable drop in pressure when multiple fixtures are drawing water, making it inadequate for normal domestic demand. Larger sizes, while capable, are simply not the minimum required by code for a standard service. Therefore, the minimum service pipe size is 3/4 inch.

In plumbing supply, the service pipe that brings water from the main into a building must be large enough to deliver adequate flow and maintain reasonable pressure for typical uses. The minimum size that reliably serves a residence is three quarters of an inch. A smaller size, like half an inch, would cause a noticeable drop in pressure when multiple fixtures are drawing water, making it inadequate for normal domestic demand. Larger sizes, while capable, are simply not the minimum required by code for a standard service. Therefore, the minimum service pipe size is 3/4 inch.