All toilets and most showerheads today meet the federal water-efficiency standards, but not all of these products perform satisfactorily. With toilets and showerheads, we include products that meet or exceed WaterSense standards, which includes performance requirements—although we go beyond WaterSense where there are issues not adequately addressed by the program. We also look for other products that conserve potable water, such as rainwater catchment and graywater recovery and reuse systems.
Watermiser Custom Flow Control Valves are installed on hot and cold water supply lines to restrict water flow to faucets and showers. For use in commercial or residential applications, these solid brass valves are sold in pairs and are available in a variety of flow rates, though the company recommends using a valve with a flow rate of 1.5 gallons per minute (gpm) for bathroom fixtures and 1.75 gpm for kitchen faucets. In multistory buildings where water pressure can vary from floor to floor, slightly different valves can be used to achieve an efficient, uniform flow rate. Unlike faucet aerators, these valves are vandal-resistant and do not support bacterial growth, according to the company. They come with a five-year warranty.
Many conservation efforts—in industrial, commercial, and residential settings—are making significant improvements in water-use efficiency. These advances are also reducing our wastewater treatment burden and expense.
EPA's WaterSense program has developed a specification for bathroom sink faucets. In order to receive the WaterSense label, a bathroom faucet must have a maximum flow rate of no more than 1.5 gpm.
WaterSense has not yet developed a specification for kitchen sink faucets, but many manufacturers offer faucets with a flow rate of 1.5 gpm, 32% below the industry standard of 2.2 gpm. As kitchen sinks are often used to fill pots, a lower flow rate is not always optimal. Several manufacturers have introduced kitchen faucets with adjustable flow rates for convenience and water conservation.
GreenSpec lists products that dispense water efficiently, increase the energy efficiency of associated plumbing, or improve controllability of the water supply, such as foot pedal controls that help prevent long periods of running water. GreenSpec lists bathroom faucets that deliver water at a maximum of 1.0 gpm and kitchen faucets that offer adjustable flow rates or other benefits.
Many conservation efforts—in industrial, commercial, and residential settings—are making significant improvements in water-use efficiency. These advances are also reducing our wastewater treatment burden and expense. Products listed here dispense water efficiently or improve controllability of the water supply.
To qualify for GreenSpec, bathroom faucets must have a flow of 1.0 gallons per minute or less. Kitchen faucets may be up to 2.5 gallons per minute, but should be installed with foot- or other controls to prevent long periods of running.
WEc1: Water Use Reduction
WEc3: Water Use Reduction
WEc3.1-3.2: Water Use Reduction
WEp1: Water Use Reduction—20% Reduction
WEp1: Minimum Indoor Plumbing Fixture and Fitting Efficiency
WEp1: Water Use Reduction
Ratings and Commentary