 faucets faucets bathroom and kitchen faucets account for 16 of the water used in an average home federal plumbing standards now specify that kitchen faucets use no more than 25 gpm and bathroom faucets use no more than 22 gpm though several use less quite effectively installing an aerator the screwon tip of the faucet can be one of the most costeffective water conservation measures your household can do because they control the flow of water through your faucet  this is especially true if your faucets are older and don t have aerators since some older models can use 5 or more gallons per minute gpm many water providers give lowflow aerators out to their customers for free or you can purchase one at most home improvement stores for about 1500 each  indoor  