According to Michigan plumbing requirements, what is the minimum pipe size for a residential water service line?
Correct Answer
D) 3/4 inch
Michigan plumbing code requires a minimum 3/4-inch water service line for residential construction to ensure adequate water pressure and flow.
Why This Is the Correct Answer
Michigan plumbing code establishes 3/4 inch as the minimum diameter for a residential water service line — the pipe running from the water main to the house. This minimum ensures adequate flow rate and pressure for typical residential demand, including multiple simultaneous fixtures. A 3/4-inch line can supply sufficient gallons per minute at acceptable pressure drops for standard single-family homes.
Why the Other Options Are Wrong
Option A: 1/2 inch
1/2 inch is the minimum size for individual fixture supply branches inside the home (such as to a single faucet or toilet), not for the service line bringing water into the building. Using 1/2-inch service line would result in severely inadequate pressure and flow throughout the home.
Option B: 1 inch
1 inch exceeds the code minimum and is commonly used for larger homes or when service line length is very long (over 100 feet), but it is not the required minimum for all residential service lines. Selecting 1 inch as the minimum confuses preferred sizing with minimum code requirements.
Option C: 1-1/4 inch
1-1/4 inch far exceeds the minimum requirement and is more typical of commercial or high-demand applications. While allowed, it is not the code minimum for standard residential service.
Memory Technique
Remember: 'Three-quarters for the street.' The service line coming from the street to your home needs at least 3/4 inch. Inside the home, branches to individual fixtures can be 1/2 inch. Street = 3/4, Fixture branch = 1/2.
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