How often Should a Septic Tank be Emptied?

Your tank should be emptied or “desludged” following the manufacturer's recommendations. If you are unsure just give us a call and we can help advise. As a general guide, Septic tanks should be emptied when the level of sludge reaches 50% of the tank’s volume.

As most people won't know how often this is, as a guide for an average household of 4 people the recommended period is that annual emptying will be required. Failure to do so will lead to suspended solids passing through to the soakaway and block your pipes and stone.

There are some common signs and symptoms that your tank is not working properly or needs emptying

  • A smell of sewage in the area
  • Slowly draining sinks, toilets and baths
  • Polluted water in a ditch or watercourse
  • Overflowing from inspection cover
  • Surface flooding “downstream” from the tank
  • Nettles and vigorous plant growth “downstream”