Page 44 - Green Builder November Issue Codes Update

Tips, Technology and Common Sense
Solutions for a Thirsty World

Opening the Graywater Spigot

Building codes are the last obstacle to extensive use of graywater in homes

CREDIT: KB HOME

It just makes WaterSense. KB Homes’ Double ZeroHouse models in Northern and Central California are designed to achieve net-zero energy
usage and conserve as much as 70 percent of the freshwater that would traditionally be used in a typical resale home.

BY CATI O’KEEFE STRICT MESSAGES

T ODAY, THE TECHNOLOGY AND KNOW-HOW exists to Builder Kim Shanahan, executive officer of the Santa Fe Area
take graywater from washing machines and showers— Home Builders Association (www.sfahba.com), is at the forefront
as well as rainwater collected from roofs—and use that of conservation efforts in the water-conscious city. “Santa Fe area
water to flush toilets and irrigate landscapes. That same home builders recognized years ago that our community’s future
water can be brought back into the house, treated, and growth was tied to the water supply,” Shanahan says. “If we can’t
used yet again. It makes a lot of sense and saves a lot of water, so stretch our limited supply of water, we can’t continue to grow and
why isn’t it happening, or even mandated, everywhere? the building industry would suffer.”

“All water reuse scenarios are doable, and most of them are covered Because Santa Fe adopted certain codes, the municipality is poised
by the current code,” says Doug Pushard, founder of HarvestH2o to take advantage of water-saving reuse. “We are going to be allowed
(http://www.harvesth2o.com/) and a designer of residential water to bring water back into the house,” he says. “We adopted 2012 UPC
management systems.“However, there are some holes—the codes have and UMC Building Codes, as well as some chapters of the code that
not been integrated. The rainwater code was driven by the American the State of New Mexico hasn’t even adopted.”
Rainwater Catchment Systems Association, and the graywater code
came from states doing it and publishing best practices.” The upshot is that the municipality can bring water back into the
house and reuse that water for toilet flushing and washing. “It’s not

42 GREEN BUILDER November/December 2016 www.greenbuildermedia.com