Exfiltration is the opposite of infiltration: the drain leaks outward. Because the water disappears into the soil, the drain may seem to work normally while it slowly saturates and erodes the ground around it.
Persistent damp patches, unusually lush strips of lawn, sewage odours in the yard, and settlement cracking nearby are typical above-ground clues.
A defect term for wastewater escaping the pipe.
At any defect, most consequentially near footings, retaining walls and slabs.
A CCTV drain inspection is the standard way to confirm whether this is what's happening in your pipes: the camera shows the condition on screen, a locator pinpoints the exact position and depth, and you get a recorded report before any repair decisions are made.
A CCTV drain inspection shows exactly what's happening inside your pipes — no guesswork.