--- title: "Drainage Issue Investigation | Northstar Plumbing" description: "Find the cause of recurring blockages, bad smells or slow drains. Structured testing and a clear report with next-step options." canonical: "https://www.northstarplumbing.co.uk/services/drainage-issue-investigation" --- ![3D render of a tidy utility-room corner with a floor access cover or drain grate, coiled inspection cable, work light, gloves, tool pouch, and a shallow tray on a slightly reflective sealed concrete floor.](/_next/image?url=%2Fapi%2Fmedia%2Ffile%2Ftidy_utility_maintenance_setup_3d_render.png%3Fv%3D1770397999169&w=1536&q=75&dpl=dpl_DEc4fGhEc1SCRZZutzoEsRuDy1CJ) Investigations & Diagnostics # Drainage Issue Investigation [Contact Us](https://www.northstarplumbing.co.uk/redirect) A drainage issue investigation is a structured fault-finding visit for when you have recurring or unexplained drain problems and need a clear answer, not guesswork. We test, inspect and trace the cause, then explain what’s happening and what it will take to put it right. ## What the service covers If your drains keep playing up, this service is designed to identify the root cause and reduce the risk of repeat call-outs. The investigation can cover: - Recurring blockages, slow-draining sinks, baths, showers or gullies - Bad smells, gurgling, bubbling, or water backing up - Intermittent problems that are hard to replicate - Suspected partial obstructions, build-up, or flow restrictions - Checks to help pinpoint whether the issue is local to one outlet or affecting the wider run - Clear findings and practical recommendations for the next step ### When this investigation is most useful This service is a good fit if you have tried basic measures but symptoms return, or if the impact is affecting tenants, customers, or day-to-day use. It’s also useful where you need a documented, professional view of what’s causing the problem before approving remedial work. ### What happens during the visit We start by discussing the symptoms and when they occur, then carry out targeted checks and tests to narrow down the fault. Depending on the site and access, we may isolate sections of the system, test flow and observe how fixtures respond to help locate the likely point and type of restriction. ### What you get afterwards You will receive a clear explanation of the findings and the options to resolve the issue. Where there is more than one possible route, we outline the pros and cons so you can choose the most sensible fix for the property and budget. ### If remedial work is needed If we identify a straightforward repair, we can often advise how to resolve it quickly. If the issue is more complex, we will recommend the next appropriate step, for example further inspection, access work, or planned clearance, so you can avoid unnecessary disruption. [Contact Us](https://www.northstarplumbing.co.uk/redirect) ## Frequently Asked Questions What types of drainage problems can you investigate? We investigate recurring blockages, slow drainage, bad smells, gurgling, and backing up. The aim is to identify the underlying cause and the most appropriate next step. Will you clear the blockage during the investigation? This service focuses on diagnosis and confirming the cause. If there is a simple, safe clearance that supports the investigation, we will advise you, but remedial work may be quoted separately. Do I need to prepare anything before you arrive? If possible, note which fixtures are affected and when the problem happens. Please clear access to manholes, under-sink cupboards, and any areas where you have seen leaks or overflow. How do you find the root cause without guessing? We use a step-by-step process: symptom review, targeted tests, and inspection of accessible pipework and points on the run. This helps confirm whether the issue is a local branch problem or further along the system. What happens after the investigation? We explain what we found in plain English and set out the recommended options to fix it. You can then decide whether to proceed with the remedial work, plan it for a convenient time, or seek further investigation if needed. 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