Concerning sanitation, while most of the population is served by sewers, according to one source about 18.3 million people (18%) out of 65 are served by on-site sanitation systems such as septic tanks.
Relating to cleanliness, while most of the population is served by sewage systems, according to one source about 18.3 million people (18%) out of 65 are served by on-site sanitation systems such as septic tanks.