The best replacement for septic tank is cesspool.

The best alternatives to septic tank are rated as following:
★★★★★  cesspool
★★★★★  sewer
★★★  lagoon
★★★  treatment plant
★★★  public sewer
★★  city sewer
★★  holding tank
★★  sewer system
★  septic system
★  cesspit
★  septic field
★  public sewer system
★  sewage treatment plant
  sand mound
  sewer line
  clogged drain
  city water
  sewage
  sump pump
  water softener
  leach field
  compost toilet
  wastewater treatment plant
  sewage line

Your alternative for septic tank is not listed? Suggest!
Speaking about septic tank, one probably shouldn't forget about drain field.

Other search terms related to septic tank and their ratings are:
★★★★★ drain field
★★★★★ leach fields
★★★ garbage disposal
★★ leach field
★ effluent pump
★ leach
leech field
You have in mind a companion for septic tank and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of septic tank in all years. Click on graph for more.
septic tank
cesspool
sewer