Drain Pest Control in Preston , Lancashire

If the noise seems to travel up through the cavity walls from beneath the ground floor, drains are almost always the culprit. You will often notice a stale, musky sewer smell alongside the scratching, especially under the floorboards or behind kitchen kickboards. If traditional traps upstairs keep catching rats but the problem never stops, they are travelling directly up from the sewer line through a broken or open sub-floor pipe.

Waterways naturally support large brown rat populations, and during colder months or heavy rain, those rats head straight into the local sewer network searching for food and dry ground. Once inside the main sewer lines, they work their way up the branch pipes connecting to nearby homes. If your private pipework has an open joint, a cracked section, or an uncapped junction, they will exploit it to get under your foundations.

When older terraced properties in Clayton-Le-Moors had outdoor toilets or old sculleries removed, builders often just cemented over the top of the old pipe rather than sealing it at the main junction. This creates a dry, hidden pocket of pipe known as a dead leg, which receives zero water flow. Rats use these abandoned runs as safe nesting burrows before chewing through soft mortar and emerging straight into your wall cavities.

Yes, we run specialized push-rod camera systems right through the internal line to inspect every joint, junction, and bend beneath the slab. If the pipe appears intact on camera but we suspect an unmapped breakout point, we can introduce safe, non-toxic tracing smoke into the drain run. If that smoke starts rising through gaps in your floorboards or around internal soil stacks, we know precisely where the rats are breaking out without tearing up the floor first.

Yes, they can cause serious ground issues under your home over time. When rats break out through an open joint or fractured clay pipe, they tunnel through the surrounding subsoil and drag the earth back down into the sewer flow. This excavation hollows out the sub-base beneath your concrete floor slab or foundation walls, which can lead to sinking floors and internal cracking if left untreated.

Poison only targets the individual rats currently running around your living space, leaving the subterranean highway completely open. The main sewer under the road holds an endless supply of rodents, so as soon as one nest dies off, another family simply tracks the scent trail back up the same broken pipe. Until you identify the physical drainage defect and mechanically seal off the subterranean entry route, you will remain stuck in a loop of laying bait.