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Sump pumps and backwater valves for Dearborn basements

Updated October 19, 2026 · referral service, not a contractor

After June 2021 the most-asked question in Dearborn is how to keep it from happening again. The honest answer is a package, not a product: a backwater valve on the sanitary lateral so the public sewer can't flow back into the house, footing drains and a sump that discharge outside instead of into that sewer, a battery backup for the outage that comes with the storm, and downspouts disconnected from the ground.

Backwater valves

A backwater valve is a one-way flap installed in the main sewer line leaving the house. When the city main surcharges, the flap closes and sewage can't come up the floor drain. It's installed by a plumber or a waterproofing contractor with a plumbing license, through a small excavation in the basement floor or outside, and it needs a Dearborn plumbing permit. Two cautions: while the valve is closed you shouldn't run water in the house, and the valve needs cleaning once in a while. Combined with a sump for the footing drains, it's the single highest-value flood step in the city.

Why a sump, if I never had one

Older Dearborn houses drained the footing tile straight into the sewer lateral. With a backwater valve closed, that water has nowhere to go, so the footing drains get rerouted to a new sump pit that pumps outside. That's the pairing: valve plus sump. A sump alone helps groundwater seepage but does nothing for a backup; a valve alone can push footing-drain water back into the basement.

Pump replacement and backups

Discharge

Outside, onto ground sloping away, not onto the neighbor's lot or the sidewalk where it freezes, and never into the sanitary sewer. On Dearborn's small lots the discharge often goes to the front yard or a dry well; the contractor should show you the route.

Permits and help

The City of Dearborn's Building & Safety permits, including plumbing permits, are applied for and paid online through BS&A. Dearborn's flood page lists the city's own sewer and stormwater projects, and the city has used federal disaster recovery funds (CDBG-DR) for green infrastructure in the northeast and southeast sections. Check that page for any current resident programs before you sign anything.

HomeGuide national averages: $650–$2,000 for a sump install or replacement; backups add several hundred dollars. Backwater valve pricing is set by the plumber. Not Dearborn quotes.

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