How did WaterSense set the specification for high-efficiency lavatory (bathroom sink) faucets?
EPA product industry and product research, as well as the American Society of Mechanical Engineers (ASME) A112.18.1/Canadian Standards Association (CSA) B125.1 standard for Plumbing Supply Fittings, form the basis of the WaterSense lavatory or bathroom sink specification. In developing the specification, EPA collaborated with interested parties representing industry, water utilities, and water-efficiency advocacy groups. The WaterSense lavatory faucet specification sets the maximum flow rate of lavatory faucets and faucet accessories at 1.5 gallons per minute (gpm) tested at a flowing pressure of 60 pounds per square inch (psi) (common water pressure in most households). It also includes a minimum flow rate of 0.8 gpm tested at a flowing pressure of 20 psi to ensure performance across a variety of different household conditions.
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