Key Takeaways
- Clay soil and heavy rain push groundwater toward Rockville basements.
- Most sump pumps fail from a stuck float, a worn motor or lost power.
- A battery backup keeps pumping when storms knock out power.
- Test your pump every spring by pouring water into the pit.
Why Rockville, MD Basements Get Wet
Much of Rockville sits on clay-heavy soil that holds water instead of letting it drain away. After heavy rain, groundwater builds up around foundations and finds its way in through floor joints and cracks. That is the usual cause of basement flooding here. Homes near the Watts Branch and Rock Creek tributaries, and those on lower lots, feel it most. Many split-levels and colonials in neighborhoods like Woodley Gardens, Fallsmead and College Gardens were built with sump pits for exactly this reason.
How a Sump Pump Works
Groundwater drains into a pit below the basement floor. When the water rises, a float switch turns on the pump, which pushes the water out through a discharge pipe away from the house. A check valve stops it from running back in. Every part has to work for the system to work.
Signs Your Sump Pump Is Failing
- It runs constantly, or never seems to turn on
- It hums but doesn't move water
- Loud grinding, rattling or clanking
- Water in the basement despite a pump in the pit
- The pump is more than about 10 years old
Every spring, pour a bucket of water into the pit. The pump should start, empty the pit quickly and shut off. If it doesn't, call before the next storm, not during it.
Why a Battery Backup Matters
The storms that fill sump pits are the same storms that knock out power. A battery backup pump takes over automatically when the main pump loses power or fails. For a finished Rockville basement, it's inexpensive insurance.
Repair or Replace?
| Problem | Usually |
|---|---|
| Stuck or tangled float | Repair |
| Failed check valve | Repair |
| Frozen or blocked discharge line | Repair |
| Burned-out motor | Replace |
| Pump over 10 years old | Replace |
| Can't keep up in heavy rain | Upsize or add a second pump |
More Ways to Keep the Basement Dry
- Keep gutters clear and downspouts extended away from the house
- Grade soil so it slopes away from the foundation
- Keep the discharge line clear, especially in winter
- Check floor drains for backups, which can be a sewer line problem
Our sump pump repair and installation covers Rockville and nearby North Bethesda, Potomac and Gaithersburg, 24/7 when a storm is underway.
