A sump pump is used to remove rainwater and small amounts of flood water from your home’s basement. Usually the pump is submerged in a sump pit and when water flows into the pit, the pump activates and pulls the water out and drains it either into the ground away from the home or into the sewer system. But if your pump is not working and you are noticing a sump pump backflow (such as wastewater, dirty water, or sewage) in your sump pit you may have a broken check valve. If it is only the valve you can save on sump pump replacement cost estimates by replacing the check valve yourself. 


This sump pump repair guide is on how to change the check valve on a sump pump. Note that if you are unsure if the valve is damaged or the entire pump is dead you may need to get sump pump repairs by a professional. Remember the key sign of a damaged check valve is reduced pumping and backflow coming back into the sump pit.


First you will need to turn off and unplug the pump power supply. Loosen up the clamps that hold the PVC pipes (both in and out) to the check valve. The valve is generally on the top of the sump pump. Loosen the clamp screws the loosen the clamps. Note some valves don’t have clamps.

 How to Reduce Sump Pump Check Valve NoisesCredit: rayb777

Use a small hacksaw to cut off the PVC pipes that run into the check valve itself. You’ll want to make a clean cut just at the point where the pipe meets the check valve. Do not cut anywhere else on the two pipes, only where they meet the check valve.


Remove the screws that hold the valve onto the pump and lift the valve right off. Don’t be alarmed if some water comes out along with some dirty water.


Put the tip of the discharge (out) pipe into the new check valve (replacement valve) discharge or waste outlet. Repeat this with the intake pipe going into the new valve’s intake outlet. If a firm seal is made (the pipe does not move at all) you can skip the next step. However if the pipe seal is not complete and slides even a little you’ll need to do a little adjusting.


Remove the tips of the two pipes from the check valve. Use a PVC coupler and place a coupler on the end of each pipe. Make sure the coupler tips going to the valve itself are slightly smaller than the intake and discharge openings on the valve. Slide the coupler of the intake pipe onto the intake opening and the discharge pipe coupler onto the discharge opening of the sump pump check valve.


Tighten the couplers on both ends using PVC clamps. Affix a good amount of PVC plumber cement around the connections of the pipes, the couplers, and the check valve. Replace the pipe clamps if you removed them when removing the old check valve. 


Finish the installation by tightening the new check valve screws. Plug in the pump and turn it on. Pour a gallon or two of water into the sump pit to initiate testing a sump pump repair. Ensure that the water drains and goes through the check valve. This should resolve your sump pump problems.

If your sump pump is making loud gurgling and swooshing noises while running the cause may be due to the check valve working. Use this guide to reduce sump pump noises: Noisy Sump Pump Check Valve Fix .  You may also want to consider looking into sump pump insurance. Sump pump insurance may protect against pump failure which can result in flooding not covered by some insurances.