Koh Phi Phi has a history of bad experiences with the involvement
of government authorities, consultants and contractors. A
centralized wastewater treatment system using waste stabilization
ponds had previously been planned and implemented by the central
government, but it never went into proper operation, as the
collection system had been implemented with at negative slope
and all wastewater accumulated at the lowest point somewhere in
the centre of the commercial district. As a consequence, the local
authority had implemented a by-law prohibiting residents from
connecting to the collection system