How long does it take to pump a basement?
It depends on the depth of the water and the size of the pump. A basement with 6 to 12 inches of water might take 2 to 4 hours. A basement with 2 feet or more of water and a slow drain might take overnight. The pump runs continuously until the floor is dry.
Draining time also depends on where the water is being discharged. If the storm drain is close and runs freely, the pump can move water quickly. If the water has to be trucked away because it is contaminated, the timeline is longer.
Once pumping is underway, a technician is on site to monitor the process and ensure the discharge is going to the right place. The water level is checked periodically and the pump is moved if necessary to reach new low points.
Where does the water go after it is pumped?
Clean water from a supply line or rain is usually discharged to a street, a storm drain, or a gravel area where it can soak. Contaminated water from a sewer backup or flooded creek may need to be tested and trucked away to a licensed disposal site.
Local codes vary on where water can be discharged. In Prince George's County, check with the Department of Public Works on where the water can go. The pump operator knows the local rules and will discharge legally.
If the water is obviously contaminated (dark, smells like sewage), assume it needs special handling and ask before pumping begins.
Can the pump damage the floor or the sump system?
No if the pump is set up correctly. A submersible pump is placed at the lowest point and draws water up and out. It will not damage the sump pit if one is already installed; it may actually help the sump catch up and start working normally again.
The pump discharge hose needs to be positioned so water does not flow back into the basement. The hose runs to a drain, a storm drain or away from the house. Once the water is gone, the pump is removed and the electrical setup is shut down safely.
If the sump pump is submerged and not running, turn off the power to it before the technician arrives. Do not attempt to retrieve it or repair it while water is still present.
What if the water keeps coming back?
If the water level does not drop or rises while the pump is running, the source is still active. A burst pipe that was not shut off, a continuous leak from groundwater, or rain entering faster than the pump can extract are the causes. The source has to be found and stopped before extraction is complete.
For a burst pipe, shut off the main water valve if you can reach it safely. For groundwater, the sump pump may be undersized, and the basement may need a larger pump or a drain system to manage the seepage long-term.
Do not assume the pump is failing if the water is not going down; assume the source is still active and has to be identified. The technician can help trace where the water is coming from.