How to Replace a Septic Tank Outlet Baffle

Septic tank baffles protect drain fields from solids.

Septic tanks anaerobically treat waste water, which creates three layers. The top layer consists of fats, greases and oils. The middle layer consists of liquid. The bottom layer is a heavy sludge. Baffles are installed on septic tanks to allow only the middle layer to leave the tank. Concrete baffles corrode due to hydrogen sulfide gases produced in the tank. Plastic baffles can be broken during septic tank pumping and maintenance. Septic system maintenance providers will inspect the baffles upon pumping of the tank. If the tank baffles are deemed broken, they must be replaced.

Things You'll Need

• Septic tank baffle assembly

Instructions

1. Remove the manhole cover over the septic tank outlet pipe.

2. Contract a reputable septic system maintenance company to pump out the septic tank. The contents of the tank will need to be removed for full access to the outlet baffle.

3. Locate the baffle that covers the outlet pipe. The baffle may be fastened to the wall of the septic tank or attached to the pipe itself. The baffles are made of plastic or concrete.

4. Saw the plastic outlet baffle off the pipe using a PVC saw. If the existing baffle is concrete, knock the remaining baffle off the tank with a sledge hammer.

5. Prime the baffle assembly and the outlet pipe with PVC primer.

6. Apply PVC cement to the baffle assembly hub and the outlet pipe.

7. Press the baffle assembly onto the outlet pipe. Turn the baffle one-quarter turn until level and hold it in place for 30 seconds.

8. Replace the manhole cover over the septic tank.

Tips & Warnings

• Working in a septic tank is dangerous. Use safety equipment.

Resources

• Environmental Protection Agency: A Homeowner's Guide to Septic Systems
• University of Minnesota Extension; Septic System Owner's Guide; Laurie Brown et al; 2008
• North Carolina State University; Septic System Owner's Guide; M. Hoover et al; June 1997