--- title: "Drain Odour & Bad Smell Investigation Bournemouth | Smoke Testing | JD Drainage" description: "Find the source of bad drain smells with smoke testing & CCTV survey across Bournemouth, Dorset & Hampshire. Permanent fix, not a cover-up. 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[Home](/) 2. [Services](/services) 3. Drain Odour Investigation JD Drainage Solutions # Find the Source of Bad Drain Smells — and Fix It Permanently, First Visit Air fresheners don't fix drainage. We use smoke testing and CCTV to pinpoint exactly where sewer gas is escaping into your property — then close it for good. No guesswork, no recurring smells. [Get a Free Quote](/contact)[03303 330401](tel:03303330401) 5/5 from 60 reviews All work guaranteed Same-day response 25+ Years of Experience 60×5★ Reviews ✓ Smoke Testing Equipped ✓ Fully Insured 100% Permanent Fix ## Why Drain Smells Happen — and Why They Recur A healthy drainage system is sealed end to end. Wastewater leaves the property through traps that hold a water seal, preventing sewer gas in the pipework from escaping back into the room. When you smell drains inside the property, it always means one of two things: a trap has failed (lost its water seal) or a pipe seal has failed (a crack, a displaced joint, a perished gasket). Surface-level fixes — pouring bleach down a sink, fitting an in-line freshener, masking with air fresheners — don't address either cause. The smell comes back the moment the masking agent dissipates because the actual fault hasn't moved. Our investigation finds the actual fault. Smoke testing introduces visible, non-toxic smoke into the drainage system at controlled pressure. Anywhere smoke emerges that shouldn't — through a wall, around a toilet base, under a bath, out of a disused waste branch — is your smell source. CCTV then verifies the defect from inside the pipe so the repair scope is exact. ## What Living with Drain Smells Is Actually Doing Sewer gas is not just unpleasant. It contains hydrogen sulphide, methane, ammonia and carbon dioxide at varying concentrations. Long-term low-level exposure causes headaches, eye irritation, nausea, fatigue and respiratory symptoms — frequently mistaken for unrelated allergies or persistent colds. For commercial premises — restaurants, cafés, hotels, offices — visible or detectable drain smell directly damages reputation. Online [reviews](/reviews) mentioning bad smells are one of the strongest negative signals in hospitality and have a measurable impact on bookings. Environmental Health Officers can also issue improvement notices under the Public Health Act 1936 where premises emit nuisance smells. For property sellers, an unresolved drain smell during viewings collapses offers faster than almost any other property defect. Buyers correctly assume that a smell means an unknown drainage fault, and price accordingly — or walk away entirely. The cost of investigation and permanent fix is almost always recovered in a single avoided offer reduction. And ignored smells get worse. A failed trap or seal that lets gas escape will also, eventually, let water escape — which means damp, rot, ceiling damage in the floor below, and a repair that runs into the thousands instead of the hundreds. ## Our Odour Investigation Process 1 ### Consultation & Symptom Mapping We talk through where the smell is, when it's strongest, whether weather or use affects it, and whether any recent works might be relevant. The pattern usually narrows the search before we arrive. 2 ### Smoke Test Non-toxic visible smoke is introduced into the foul drainage system at controlled low pressure. Any escape point — wall, floor, fixture, disused branch — becomes immediately visible. The whole property is observed during the test. 3 ### CCTV Verification Each smoke-escape point is then surveyed with CCTV from inside the pipe to confirm the defect, measure it accurately and document it for the repair quote. 4 ### Written Report & Quote You receive a written report identifying every fault, the cause of each, and a fixed-price quote for the permanent repair. No 'discovery' invoices later. 5 ### Permanent Repair Faults are sealed properly — trap replacement, joint re-sealing, branch capping, patch lining or [excavation](/services/excavations-new-drains) depending on defect. Final verification confirms the smell is gone. ## Why Our Investigation Works When Other Approaches Fail ### Smoke Testing The only diagnostic method that physically reveals every escape point on the property simultaneously. Plumbers without smoke testing equipment are guessing. ### CCTV Verification Every fault confirmed from inside the pipe. No 'might be' explanations — we show you exactly what's wrong on screen. ### Permanent Fix, Not a Mask We don't recommend in-line fresheners. We find the fault and seal it. The smell doesn't come back because the cause is gone. ### Single Visit Diagnosis Most domestic odour investigations are completed in a single half-day visit. You leave the appointment knowing the cause and the cost. ### Discreet Commercial Service For restaurants, hotels and offices we attend out-of-hours and don't display branded vehicles. Customers never know we were there. ### Written Diagnostic Report Full report with photos, CCTV stills and repair recommendations. Suitable for insurance claims, conveyancing disclosure and environmental health responses. ## Common Sources of Drain Smells — and Why Each One Happens Dried-out traps are the most common cause of drain smell in residential properties. A trap is the U-bend (or P-trap, or S-trap) beneath every sink, basin, bath, shower and toilet. The U-bend holds a water seal that physically blocks gas from rising. In a guest bathroom, holiday let, or any rarely-used fixture, evaporation can empty the trap in 2–4 weeks. Running water for 30 seconds re-fills it — but if the smell returns repeatedly, the trap has a leak and needs replacing. Failed waste pipe joints under sinks and basins are the second most common cause. Old compression fittings perish, push-fit seals harden, and the joint develops a slow gas leak long before it develops a water leak. Smoke testing makes the leak immediately visible. The fix is usually a single joint replacement. Disused waste branches are the worst offenders in older properties that have been modernised. When a bathroom is moved or a sink removed, the waste branch is often capped with a push-fit stopper that perishes within a few years. The capped branch then becomes a direct open path from the foul stack into the wall void or floor cavity, and smell follows the path of least resistance into the room. Cracked or displaced soil and vent pipes (the vertical pipes that take waste from upper floors down through the building) are responsible for the worst-smelling cases we see. Damage typically occurs in concealed sections — boxed-in pipework, voids and roof spaces — and the smell escapes wherever the void connects to a habitable room. CCTV reveals the exact location. External issues — broken inspection chamber covers, damaged gulley traps, missing vent stack terminations — let sewer gas vent at low level near windows, doors and air bricks. Smell appears to come from inside the property but actually originates outside. Smoke testing confirms the external origin. Less commonly, smells are caused by drain runs that have lost their fall and pool waste between flushes. Pooled waste decomposes anaerobically, producing the characteristic hydrogen-sulphide rotten-egg smell that periodically vents back through the system. CCTV reveals the gradient defect and the fix usually requires either jetting and bio-treatment or, in serious cases, re-laying the affected section. Smoke testing is non-toxic, leaves no residue and is safe for use in occupied buildings including food premises. We use industry-standard liquid smoke equipment that produces visible smoke at low pressure — the same technology used by water authorities and pollution investigators. ## Frequently Asked Questions How much does a drain smell investigation cost? Is smoke testing safe in an occupied property? What if the smell only happens sometimes? Can you guarantee the smell will go? What if there's more than one source? Do you offer this for commercial premises? ### Related Services - [CCTV Drain Surveys](/services/cctv-drain-surveys) - [Drain Rat-Proofing](/services/drain-rat-proofing) - [Drain Re-Lining](/services/drain-relining) - [Blocked Drains](/services/blocked-drains) ### Service Areas - [Bournemouth](/areas/bournemouth) - [Poole](/areas/poole) - [Christchurch](/areas/christchurch) - [Dorchester](/areas/dorchester) - [Weymouth](/areas/weymouth) - [Wimborne](/areas/wimborne) - [Wareham](/areas/wareham) - [Dorset](/areas/dorset) - [Swanage](/areas/swanage) - [Bridport](/areas/bridport) ## Ready to Solve Your Drainage Problem? No call-out fees. No hidden charges. Speak to our team today and get a free, no-obligation estimate. [Request a Free Estimate](/contact)[03303 330401](tel:03303330401) [JD Drainage ](/) Professional [drainage services](/services) across the South of England. 25 years of experience. No call-out charge. All work guaranteed. Read our [customer reviews](/reviews). [03303 330401](tel:03303330401) [info@jddrainage247.co.uk](mailto:info@jddrainage247.co.uk) 74 Cucklington Gardens, Bournemouth, BH9 3QS #### [Our Services](/services) - [Blocked Drain Clearance](/services/blocked-drains) - [CCTV Drain Surveys](/services/cctv-drain-surveys) - [Drain Re-Lining & No-Dig Repairs](/services/drain-relining) - [Excavations & New Drains](/services/excavations-new-drains) - [Soakaway Installation & Repair](/services/soakaways) - [Pitch Fibre Pipe Repairs](/services/pitch-fibre-repairs) - [Commercial Drainage Services](/services/commercial-drainage) - [24/7 Emergency Drainage](/services/emergency-drainage) - [High Pressure Drain Jetting](/services/high-pressure-jetting) #### [Service Areas](/areas) - [Drainage in Bournemouth](/areas/bournemouth) - [Drainage in Poole](/areas/poole) - [Drainage in Christchurch](/areas/christchurch) - [Drainage in Dorchester](/areas/dorchester) - [Drainage in Weymouth](/areas/weymouth) - [Drainage in Wimborne](/areas/wimborne) - [Drainage in Wareham](/areas/wareham) - [Drainage in Dorset](/areas/dorset) - [Drainage in Swanage](/areas/swanage) - [Drainage in Bridport](/areas/bridport) - [Drainage in Blandford Forum](/areas/blandford-forum) - [Drainage in Gillingham](/areas/gillingham) - [Drainage in Southampton](/areas/southampton) - [Drainage in Portsmouth](/areas/portsmouth) - [View all 45 areas →](/areas) #### Company - [About Us](/about) - [Customer Reviews](/reviews) - [Our Work](/our-work) - [Special Offers](/specials) - [Drain Repair & Home Insurance Guide](/guides/drain-repair-home-insurance) - [First-Time Buyer CCTV Survey Guide](/guides/bournemouth-first-time-buyer-cctv-drain-survey) - [Get a Free Quote](/contact) - [Privacy Policy](/privacy-policy) - [Terms & Conditions](/terms-conditions) - [Cookie Policy](/cookie-policy) © 2026 JD Drainage Solutions Ltd. 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