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uk Home & property emergencies multiple drains gurgling • gurgling sink drains • toilet bubbling when sink runs • sewage smell inside house • smells like sewer gas home • foul drain smell suddenly • slow drains whole house • main drain blockage signs • backed up drains warning • sewage odor after flushing • downstairs drain gurgling • shower drain gurgling • floor drain smells sewage • intermittent sewer smell • plumbing vent problem smell • drain trap dried out smell • shared sewer blockage • suspected sewer backup • home smells like drains

What to do if…
multiple drains start gurgling and your home smells like sewage

Short answer

Stop using water in the property right now (don’t flush, run taps, or use appliances) and check whether anything is backing up at the lowest drain/toilet. If it may be a shared/public sewer blockage, contact your water company; otherwise contact an emergency plumber/drain specialist.

Do not do these things

  • Don’t keep flushing or “test it again” by running taps (this can force sewage back into the home).
  • Don’t pour drain cleaners/caustic chemicals into multiple fixtures (they rarely fix a main blockage and can injure you or a tradesperson later).
  • Don’t enter/clean any area with sewage water without protective gloves/boots and good ventilation.
  • Don’t use electrical sockets/appliances in any area where water is rising or the floor is wet.
  • Don’t ignore dizziness, nausea, headache, or breathing irritation—step outside for fresh air.

What to do now

  1. Pause all water use immediately. Tell everyone in the home: no flushing, no showers, no dishwasher/washing machine, no running taps.
  2. Ventilate and create a safer “waiting zone”. Open windows/external doors if safe to do so. Keep children and pets away from bathrooms/utility areas.
  3. Check for a developing backup (2 minutes).
    • Look at the lowest places: downstairs toilet, shower tray, bath, floor drain, or lowest sink.
    • If water level is rising, bubbling, or there’s visible waste: treat it as a sewage backup.
  4. Do a quick outside check (only if safe).
    • If you have an inspection chamber/manhole cover on your property, look around it for overflowing water/sewage or obvious pooling.
    • Do not open covers if you’re not confident and equipped to do it safely—just use what you can see as a clue for who to call.
  5. If a backup is starting, prevent worsening damage.
    • Turn off the main water supply at the stopcock/isolating valve if anyone might accidentally use water.
    • If any floor area is wet and near electrics, switch off power to affected circuits at the consumer unit only if you can do so safely from a dry area. If you can’t do this safely, leave electrics alone and keep people out of the area.
  6. Work out who to call first (this matters in the UK).
    • If you suspect a blocked sewer (outside chamber/cover area overflowing, or signs suggest it’s beyond your internal pipework): contact your local water company to report a blockage.
    • If it seems confined to your property only (no outside overflow and only your home affected): call an emergency plumber/drain clearance company.
    • If you rent: notify your landlord/letting agent immediately and ask who they want you to use for emergency call-outs.
  7. If you can do it safely, take quick evidence for later. Photos/video of gurgling fixtures, any visible overflow points, and affected areas (useful for landlord/insurer and any water-company process).
  8. If anyone has been in contact with sewage water: wash skin thoroughly with soap and water, remove contaminated clothing, and keep contaminated items away from kitchens/food areas.

What can wait

  • You don’t need to diagnose whether it’s a vent, trap, or main blockage right now—treat it as a possible main/sewer issue until proven otherwise.
  • You don’t need to start deep-cleaning or ripping out materials until the blockage/source is fixed and any sewage water has stopped.
  • You don’t need to decide today what to replace or claim—focus on preventing spread and documenting what you can.

Important reassurance

Gurgling across multiple drains plus a sewage smell is a common sign of drainage/venting problems or a developing blockage. Acting early—by stopping water use and calling the right service—often prevents a much worse sewage backup and reduces repair time and cost.

Scope note

These are first steps to stabilise the situation and avoid making it worse. Diagnosis, cleanup, repairs, and any insurance/water-company processes come after the system is made safe and the source is confirmed.

Important note

This is general information, not professional plumbing, legal, or health advice. If you feel unwell from fumes, can’t ventilate, or sewage is actively entering living areas, prioritise getting to fresh air and getting urgent professional help.

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