Infiltration shows on camera as water trickling or jetting in where none should be. Beyond the extra flow, it carries soil fines into the pipe, which both builds sediment inside and creates voids outside — the precursor to ground subsidence.
Water authorities care about infiltration because it consumes sewer capacity and treatment resources, particularly during prolonged rain.
A defect term for external water entering the drainage system.
Below the water table, in wet-weather-affected ground, at any pipe defect.
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.