an abstractionpollution standard which varies according to the type of product that is used eg energy mix could also eliminate incentives for userspolluters to switch to products that cause less water risk conversely a regulation that focuses on the environmental outcome eg diversion limit or ambient water quality standards would provide more flexibility for userspolluters to find lowcost improvementabatement options they should also not usually specify which technologies are to be used to reach a certain water security target regular consideration should also be given to whether existing regulations unnecessarily limit userspolluters flexibility to apply existing costsaving improvementabatement options or to develop new ones