How to Install a Sink Pump in a Basement

A finished or partially finished basement can provide you with much needed space for a variety of purposes. By utilizing this area for items such as laundry rooms, cleaning areas and hobbies it will free up valuable space in other areas of your home. In many cases, a sink or other plumbing is either required or would be a major convenience. Plumbing within a basement presents certain obstacles, however, because it is often below sewer level, which is gravity fed. For this reason a sink pump will need to be installed to pump the waste water from the basement level up to the sewer or septic drain line so it can be removed.

Adding a basement laundry room means you'll probably also need a sink pump.

Install water lines to the sink if they are not already in place. While your immediate application may only call for cold water, install both hot and cold water lines to the sink area. (Later you may add a washer and dryer.) Locate the nearest water lines and after turning off the water cut into the lines and install tee fittings. From this tee install your piping to the sink. Install individual water valves on each of these lines. At the valve, install a flex hose which will be attached to the sink faucet. Make certain all fittings are secure and watertight.

Insert the pump unit beneath the sink. The amount of available space will of course depend on the size and model of pump you selected as well as the type of sink you have installed. In most cases, the pump unit will easily fit below the sink basin. Install PVC pipe from the sink drain to the pump. Be certain to clean all pipe ends with pipe cleaner before cementing in place. It is advisable to install a trap in the drain line between the sink drain and the pump. This will help prevent foreign objects from entering the pump accidentally.

Cut into a nearby drain line and install a tee fitting. Connect PVC pipe from this fitting to the pump unit. About one foot from the tee fittings install a check valve that will prevent water from being pumped or flowing back toward the sink pump when it is not in operation. Clean all couplings and fittings carefully before applying the pipe cement. Hold each junction together for several seconds to ensure a secure bond. At the pump unit attach the drain line to the outlet port of the pump. Double check all joints to be certain they are secure and watertight.

Connect the pump to a power supply. In most cases the pump will need a 110 volt outlet. The outlet must be a GFCI device. These are required in damp areas, basements and other areas where additional protection is necessary. Once the power supply is connected the sink is ready to test.

Things You Will Need

  • PVC pipe
  • PVC pipe cleaner
  • PVC pipe cement
  • Hack saw
  • Tape measure
  • Screwdriver
  • Check valve


  • Some pumps will have multiple inlet ports. Make certain any unused ports are capped prior to using the pump.


  • Before cutting into the drain line you will want to make certain the washing machine and dishwasher are turned off and no one is using the toilet or shower.

About the Author

Tom Raley is a freelance writer living in central Arkansas. He has been writing for more than 20 years and his short stories and articles have appeared in more than 25 different publications including P.I. Magazine, Pulsar and Writer's Digest.

Photo Credits

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