Drainage & Septic

How to post a blocked drain job

Updated 8 min read

A slow sink, overflowing toilet and backed-up outdoor gully may all be described as a blocked drain, but they point to different locations and equipment. A clear post tells the drainage professional which fixtures are affected, how the problem developed and whether wastewater is escaping.

Avoid repeatedly flushing toilets or running taps to test a severe blockage. Limit water use, keep people away from contaminated water and describe the situation as it is now.

List every affected fixture

  • Name each toilet, sink, shower, bath, appliance waste and outdoor gully affected.
  • Say whether one fixture is slow or several fixtures back up together.
  • Mention gurgling, smells, water-level changes and visible overflow.
  • State when the problem started and whether it is worsening.
  • Explain whether neighbouring properties appear affected in a shared building.

Describe safe access points

Photograph visible inspection covers, gullies and the affected fixtures, but do not lift heavy covers or enter confined spaces. State whether access is in a driveway, garden, basement, apartment common area or public footpath. Mention parked vehicles, locked gates and recent landscaping over pipe routes.

Share relevant history

Mention previous blockages, known root problems, damaged pipes, septic systems, extensions or recent building work. Say what simple actions were tried and whether they changed anything. Do not mix multiple chemical drain products, and tell the professional if any product has already been used.

Ask about diagnosis and cleanup

  • Does the response cover clearance only or investigation of the cause?
  • When would a camera survey or other inspection be recommended?
  • Is removal of debris and contaminated water included?
  • How will pipe damage or repeat blockage risk be documented?
  • What areas need to remain unused until work is complete?

Compare the response, not only the call-out price

A useful reply should separate the immediate clearance from any further investigation or repair. Ask what the first visit includes, how additional work would be approved, and whether you will receive photos or a short explanation of the cause. This makes it easier to compare providers and decide what to do if the blockage returns.

Copyable blocked drain description

Example: 'The downstairs toilet and shower gully both back up when the toilet is flushed. Upstairs fixtures drain normally. The problem began this morning and we have stopped using the downstairs bathroom. No chemicals have been added. An inspection cover is visible in the rear patio with 90 cm side access. Photos show the fixtures, gully and access route. The house is in Waterford and access is available today.'

Frequently asked questions

How do I know whether the blockage is inside or outside?+

You do not need to diagnose it. List every affected fixture, what triggers the backup and any accessible inspection points so the professional can assess the likely scope.

Should I keep flushing to test it?+

No. Repeated testing can increase overflow and damage. Limit water use and report the current symptoms.

Should I mention drain cleaner?+

Yes. Tell the professional exactly what was used and when so they can plan safer handling.

What photos are useful?+

Photograph affected fixtures, visible overflow, gullies, inspection covers and the route for equipment, without opening unsafe covers.

When should I ask about a camera survey?+

Ask when blockages repeat, the cause is unclear or damage is suspected. The contractor can explain whether a survey is useful after initial assessment.

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