PMI's Water Efficiency Studies

Over the past few years, Plumbing Manufacturers International (PMI) has teamed up with allies and researchers to explore the use of and potential for water-efficient plumbing products to save water.

Water-efficient toilets can save hundreds of billions of gallons of water each year

Water-efficient toilets could potentially save up to 170 billion potable gallons of water per year across five states facing water scarcity, according to research released in 2017 by the Alliance for Water Efficiency (AWE) and Plumbing Manufacturers International (PMI). This five-state savings can be extrapolated to an estimate of up to 360 billion potable gallons of water per year saved nationally.

The “Saturation Study of Non-Efficient Water Closets in Key States” focused on Arizona, California, Colorado, Georgia and Texas – all states that have experienced serious water shortages. The savings projected by the study (170 billion gallons of potable water yearly or 465 million gallons saved per day) could be achieved if non-efficient toilets in residential properties are replaced with water-efficient ones.

Using the AWE/PMI study estimate of 170 billion gallons of water, these examples show how much water can be saved within residential properties located in the five states included in the study:

  • Enough water saved to take 10 billion showers – more than one for each person on the planet
  • Enough water saved to serve the indoor home water needs of a city of 100,000 for 45 years
  • Enough water saved to fill 250,000 Olympic-sized swimming pools
  • Enough water saved to fill 1,000 Rose Bowls
  • Enough water saved to equal the water that goes over Niagara Falls in 2 1/2 days

Read more.

Download the full study.

Much upside remains for WaterSense market penetration

Despite the urgent need to save water, consumers and businesses in drought-stricken states have been slow to purchase and install water-efficient toilets, showerheads and bathroom faucets, according to a study conducted by GMP Research, Inc., and commissioned by Plumbing Manufacturers International (PMI) released in 2015.

The GMP Research/PMI study found that only 5.5% of California’s 33.5 million installed residential and commercial toilets were high-efficiency toilets using 1.28 gallons per flush – the Environmental Protection Agency’s WaterSense® standard for toilets evaluated to be at least 20% more water-efficient than other plumbing products meeting federal standards. Despite the drought conditions in California, only 21.1% of bathroom faucets there met the WaterSense standard of 1.5 gallons per minute (gpm) and 23.9% of showerheads met the WaterSense standard of 2.0 gpm.

The study further found that, on average, 6.7% of the toilets installed nationwide are WaterSense toilets, 25.4% of bathroom faucets are WaterSense faucets and 28.7% of showerheads are WaterSense showerheads.

Read more.

Download the full study.