Drains and sewers are generally designed to be self-cleaning, however careful maintenance is still important for their longevity:


  • periodically examine the system to identify any necessary repairs, paying particular attention to manholes
  • check for water overflowing from gullies or manhole covers
  • clear any blockages, including partial blockages


  • damage drains and obstruct access to manhole covers
  • put potentially blocking items down the toilet, such as nappies
  • pour cooking fat or oil into the sink or drains, as it will solidify and cause blockages.