FA / m ³ ) ▁in ▁ 2 0 0 7 . ▁ ▁Cost ▁recovery ▁for ▁urban ▁water ▁All ▁the ▁financial ▁costs ▁for ▁water ▁supply ▁are ▁entirely ▁recovered , ▁which ▁is ▁highly ▁unusual ▁for ▁a ▁water ▁utility ▁in ▁Sub - S ah aran ▁Africa . ▁Interest - free ▁long - term ▁lo ans ▁provided ▁by ▁international ▁financial ▁institutions ▁to ▁the ▁Sen eg al ese ▁government ▁are ▁on - l ent ▁to ▁the ▁asset ▁holding ▁company ▁and ▁are ▁recovered ▁from ▁users ▁through ▁the ▁b ills ▁issued ▁and ▁collected ▁by ▁S DE . ▁ ▁Tar iffs ▁and ▁cost ▁recovery ▁for ▁se wer age ▁A ▁san itation ▁sur charge ▁of ▁US $ 0 . 0 5 / m ³ ▁is ▁lev ied ▁by ▁S DE ▁on ▁beh alf ▁of ▁ON AS ▁on ▁water ▁customers ▁in ▁all ▁cities ▁with ▁a ▁se wer ▁network . ▁The ▁sur charge ▁represents ▁six ▁percent ▁of ▁the ▁water ▁bill ▁for ▁households ▁using ▁ 5 0 ▁m ³ ▁per ▁month ▁of ▁water . ▁Re ven ues ▁generated ▁by ▁this ▁sur charge ▁are ▁ins u fficient ▁to ▁fin ance ▁ON AS ▁operations ▁and ▁maintain ▁se wer age ▁and ▁d rain age ▁networks . ▁Ach ieving ▁financial ▁sust ain ability ▁of ▁ON AS ▁and ▁finding ▁means ▁to ▁dev ote ▁resources ▁for ▁on - site ▁san itation ▁promotion ▁and ▁development ▁remains ▁a ▁major ▁challenge ▁for ▁the ▁sub - se ctor . ▁ ▁While ▁municipal ities ▁are ▁not ▁responsible ▁for ▁san it ary ▁or ▁storm water ▁d rain age , ▁they ▁are ▁never theless ▁supposed ▁to ▁transfer