Sump Pump in Glenn Dale, MD

My house is newer. Why is the sump pump already failing?

The median home in Glenn Dale was built in 1991, so plenty of houses here still have the pump the builder installed. Builder-grade pumps are often sized for an average lot and run on simple switches that wear out with years of cycling. A pump can also fail from the opposite problem: it sits idle through a dry summer and the float sticks or the seal dries out. If yours is original to a house from the 1990s or early 2000s, a test before the wet season is a good idea, and replacement may not be far off.

Why does water come back in when the pump stops?

That is usually the check valve. It sits on the discharge pipe above the pump and keeps the water already pumped up from falling back into the pit. When it fails, the pump moves the same water over and over, cycles more often and wears out faster. A loud thump when the pump shuts off can also point to the valve. Replacing it is a routine repair, and the plumber can check the pump at the same visit.

What happens to the discharge line in winter?

Freezing nights can turn water sitting at the low end of the outdoor pipe into a plug of ice. The pump then pushes against a blocked line, overheats or trips its outlet, and the pit backs up during a thaw. A plumber can regrade the pipe so it drains between cycles, shorten an exposed run, or add an overflow outlet near the house that lets water escape if the far end is frozen.

A local note

Glenn Dale is an unincorporated community in central Prince George's County between Bowie and Lanham. WSSC Water serves the county with water and sewer, so check your bill to confirm your provider, and call WSSC at 301-206-4002 for sewage overflowing from a public manhole. Most plumbing and gas work in the county is done by a plumber registered with WSSC Water, with permits and inspections through WSSC. Have the pump's age and any recent symptoms handy when you call.