Drain Smell Investigation: We Find & Fix Bad Odours
Can you smell sewage or rotten eggs? We trace & fix internal drain smells fast using smoke testing technology. Serving Watford & London. Book an investigation
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Can you smell sewage or rotten eggs in your home?
There are few things more distressing than a persistent smell of sewage inside your property. It is embarrassing when guests visit, and air fresheners or bleach only mask the problem temporarily. If the smell keeps coming back, it indicates a physical breach in your drainage system.
At Drain 247, we specialise in Advanced Odour Detection. Unlike general plumbers who may only look at the U-bend, we look at the entire drainage infrastructure to locate exactly where sewer gas is escaping. We serve homeowners and businesses across Watford, Hertfordshire, and London with fixed-price investigation services.
The Hidden Dangers of Sewer Gas (Why you must act)
The smell you are noticing is likely Sewer Gas, a complex mixture of toxic and non-toxic gases. The primary component causing the “rotten egg” odour is Hydrogen Sulfide.
While low levels are simply unpleasant, chronic exposure can cause headaches, nausea, and fatigue. Furthermore, sewer gas contains methane, which can be flammable in high concentrations.
This is not just a plumbing issue; it is a health and safety issue.
Common Causes of Internal Drain Smells
Through our years of experience, we find that 90% of internal smells stem from these four defects:
Dry or Failed Traps: In guest bathrooms or rarely used showers, the water in the U-bend can evaporate, breaking the “water seal” that blocks gas.
Damaged Soil Stacks: The vertical pipe hidden behind your walls may have a hairline crack or a loose joint.
Toilet Wax Seal Failure: If a toilet rocks slightly when you sit on it, the seal at the base may have broken, allowing gas to escape at floor level.
Blocked Vent Pipes: Every drainage system needs to “breathe” via a roof vent. If this is blocked by birds’ nests or debris, pressure builds up and pushes gas back into your home.
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How We Find the Leak: Smoke Testing & CCTV
Because gas is invisible, we use forensic drainage technology to “visualise” the leak.
CCTV Drain Survey: We insert a high-resolution camera into your pipework to check for structural collapses, root ingress, or subsided pipes that are trapping waste.
Smoke Testing (The Gold Standard): If the CCTV shows no obvious cracks, we perform a Smoke Test. We pump a dense, harmless, non-toxic smoke into the drainage system and seal the vents. We then walk through your property.
The smoke will invariably escape through the tiniest crack or failed seal, instantly revealing the source of the smell—whether it’s behind a tiled wall or under a floorboard.
Frequently Asked Questions
Will the smoke damage my furniture?
No. The smoke is non-toxic, odourless, and leaves no residue. It dissipates within minutes of opening a window.
Do I have to pay a call-out charge?
No. Drain 247 operates with NO call-out fees. You only pay for the investigation and the solution.
Can you fix the problem on the same day?
In most cases, yes. Our vans are fully stocked with lining equipment and replacement parts to seal the breach immediately.
Why does the smell get worse when it rains?
Changes in atmospheric pressure or heavy rain filling the sewers can force trapped gases back up your pipes. If your vents are blocked, this gas has nowhere to go but into your house.
Will bleach fix the smell?
No. Bleach only kills bacteria in the U-bend. It does not fix the underlying cause, such as a dried trap or a crack in the pipe. The smell will return within hours.
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