The life span of a sump pump is relative to use. I normally tell people 3-5 years, but pumps can last much longer that. I replaced a sump pump recently that was 35 years old! The customer would change the float switch when it failed and the pump just kept on running. This is a unique situation where the homeowner knew what to do and how to do it. What I do tell people is that if you have a back-up sump pump system, you can you the primary pump until it dies.
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