A contractor is installing a new water service line in Michigan. According to state plumbing requirements, what is the minimum depth for water service lines to prevent freezing?
Correct Answer
B) 6 feet
Michigan plumbing code requires water service lines to be installed at least 6 feet below grade to prevent freezing in Michigan's cold climate.
Why This Is the Correct Answer
Michigan's plumbing code requires water service lines to be buried at a minimum depth of 6 feet below grade. This depth places the pipe below Michigan's frost line in most areas of the state, preventing the water supply from freezing during harsh winter conditions. Michigan's severe winters (frost can penetrate 42 to 60 inches in many areas) necessitate this relatively deep burial requirement.
Why the Other Options Are Wrong
Option A: 8 feet
8 feet is deeper than Michigan's minimum requirement of 6 feet. While burying water lines 8 feet deep would certainly prevent freezing, it exceeds the minimum code requirement and is unnecessarily costly. The question asks for the minimum depth.
Option C: 4 feet
4 feet is insufficient for Michigan's climate. In many parts of Michigan, frost penetrates well beyond 4 feet, which would leave a water service line vulnerable to freezing. This depth might be acceptable in warmer southern states but is not compliant with Michigan's code.
Option D: 5 feet
5 feet may seem close to the correct answer but falls short of Michigan's 6-foot minimum requirement. In colder northern Michigan regions, 5 feet may not provide adequate protection against frost penetration.
Memory Technique
Michigan = 6 feet for water service lines. Think: Michigan is a cold state — cold enough to need 6 feet of protection. The number 6 also matches the number of letters in 'frozen' — freeze-proof at 6 feet. Alternatively: Michigan has two peninsulas — the 6-foot depth covers both.
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