In drainage, backflow means wastewater returning toward the property, usually under surcharge conditions. In water supply, it means contaminated water being pushed or siphoned back into clean pipes — a health hazard that plumbing codes control with backflow prevention devices and air gaps.
Properties below surrounding sewer levels are most at risk of drainage backflow and may need reflux valves for protection.
Describes reversed flow and the risks it creates in drainage and supply systems.
Low-lying properties, flood-prone areas and any cross-connected pipework.
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.