How deep should underground sump pump discharge lines be buried?
By My Yard Editorial Team · 7/28/2026
The Quick Answer
Bury solid discharge pipe 12–24 inches deep with continuous slope to daylight. In freezing climates, either go below frost line or add a freeze-relief tee near the house.
The Witty Breakdown
Frozen discharge lines are the #1 cause of sump pump burnout. The pump runs against a solid ice plug until the motor gives up.
Use solid pipe, not perforated. Perforated pipe just dumps the water back into the soil beside your foundation.
Step-by-Step Fix
- 1
Use solid SDR-35 or schedule 40 PVC, glued joints.
- 2
Maintain at least 1% fall the whole run.
- 3
Install a freeze-relief tee within a few feet of the house so water can escape if the line ices.
- 4
Terminate with a pop-up emitter or daylight outlet 15+ feet away, downhill.
Pro-Tip / Do Not Do This
Don't run the discharge into a dry well right beside the foundation. You're pumping water in a circle and paying the electric bill for it.
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