▁interest ▁of ▁users ▁and ▁potential ▁users ▁of ▁the ▁goods ▁and ▁services ▁provided ▁by ▁util ities ▁so ▁that ▁there ▁is ▁effective ▁competition ▁when ▁competition ▁is ▁introduced ▁in ▁each ▁utility ▁sector ▁and ▁protection ▁of ▁users ▁from ▁ab uses ▁of ▁mon opol y ▁positions ▁is ▁ens ured ▁because ▁certain ▁public ▁utility ▁se ctors ▁have ▁a ▁mon opol y ▁over ▁the ▁market . ▁ ▁Fac il itate ▁and ▁encou rage ▁private ▁sector ▁participation ▁in ▁invest ments ▁in ▁public ▁util ities ; ▁▁ ▁Ens ure ▁comp liance ▁by ▁public ▁util ities ▁with ▁the ▁laws ▁gover ning ▁their ▁activities . ▁ ▁The ▁purpose ▁of ▁the ▁ag ency ' s ▁water ▁and ▁san itation ▁department ▁is ▁to : ▁▁ ▁reg ulate ▁in ▁a ▁way ▁that ▁prom otes ▁fair ▁competition , ▁sust ain able ▁and ▁efficient ▁use ▁of ▁water ▁resources ; ▁▁ ▁ensure ▁better ▁quality ▁of ▁services ▁to ▁customers ▁at ▁fair ▁prices ; ▁ ▁ensure ▁effective ▁protection ▁of ▁environment ▁by ▁enfor cing ▁was tes ▁dispos al ▁and ▁by - products ▁treatment ▁reg ulations . ▁ ▁In ▁practice , ▁according ▁to ▁the ▁ag ency ' s ▁annual ▁reports ▁up ▁to ▁ 2 0 0 4 , ▁it ▁seems ▁that ▁the ▁regul atory ▁ag ency ▁focused ▁much ▁of ▁its ▁activities ▁in ▁the ▁water ▁and ▁san itation ▁sector ▁on ▁the ▁super vision ▁of ▁the ▁management ▁contract ▁for ▁Elect rog az ▁( now ▁E WS A ). ▁ ▁Service ▁provision ▁ ▁Urban ▁areas . ▁The ▁Water ▁and ▁San itation ▁Corporation ▁( W AS AC ) ▁is ▁in ▁charge ▁of ▁urban ▁water ▁supply ▁and ▁san itation