At a household level, pits [closed pit, dual pits and ventilated pits] and septic tanks are onsitewaste disposal systems.

ONSITE

WET
Septic tank
Pour-flush latrine
DRY
Pit latrine with slab
Composting Latrines
Ventilated improved pit
Ecological Sanitation

The public sewer is considered advanced as it takes the sewage off-site. However this requires heavy investment in terms of collection, transportation, treatment and discharge. However governments seem to be reluctant to take up public sewer projects.
Further both treatment and discharge generally fall short of desirable standards.Thus an alternative being considered is theDEWATS/DEWAMSsystem.

OFFSITE
Public sewer
DEWATS/DEWAMS

For DEWATS & DEWAMS the latrine can also be quite close to the site of the toilet as the system can be designed for cluster housing or a hotel as long as minimal supply of waste is available.