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Les McMullin, supervisor of Tucson's Reid Park Zoo, said watering plants with water from sinks and drinking fountains at the zoo's Lee H. Brown Family Conservation Learning Center saves money. (Cronkite News photo/Lauren Wells)

TUCSON, Ariz. -- The green tree python on display in the Reid Park Zoo's Lee H. Brown Family Conservation Learning Center coils to collect rain.

Visitors who come to this building to learn how such animals adapt to their surroundings, some by conserving water, may not know that they are doing the same when they use the sinks and water fountains.

In addition to cisterns that collect rain that hits the roof, channeling it to be used for irrigation, the center that opened in 2008 features a gray water system that sends water through underground pipes to water plants outside.

To Les McMullin, Reid Park's supervisor, the benefits involve more than helping the environment.

"It costs us a lot less, and the city a lot less, to use reclaimed water rather than potable," he said.

Since 2008, Tucson has required plumbing in new homes to allow homeowners to set up gray water systems to reuse water from bathroom sinks, showers and tubs as well as washing machines to water plants and lawns. Noting that a third of household wastewater typically can be reused as gray water, the city also offers a $1,000 rebate to homeowners installing permanent gray water systems.

Tucson Water has helped fund gray water demonstration sites at the zoo as well as some businesses, social service agencies and government offices.

Brad Lancaster, the Tucson-based author of the book "Rainwater Harvesting for Drylands and Beyond," said that a gray water system can reduce an average household's water bill by 30 percent to 70 percent.

"If they redirected their gray water to the landscape instead of the sewer, they could meet easily over half of their landscape irrigation needs just with the gray water," he said.

Lancaster said that Tucson's population and water consumption are growing, but its water resources are fixed.

"We need to become much more efficient and creative at how we reuse," he said. "We need to recycle what we have multiple times and do it in the lowest-energy, highest-productive way."

At his home in Tucson, Lancaster has a multi-pipe drain system connected to his outdoor washing machine that uses gravity to send the water down to his citrus trees. He also has a branched gray water system that sends water from his bathroom sink and shower outside for irrigation. At any point he is able to turn a valve and the water is redirected to the sewer.

"It reconnects you with where things come from and where things go," he said.

City Councilman Paul Cunningham noted that Tucson changed its gray water regulations a year and a half ago because so few people were installing systems, adding the rebate and also removing a requirement that homeowners receive permits. Instead of permits, the city requires homeowners to follow a list of best management practices established by the Arizona Department of Environmental Quality.

"I feel Tucson's long term sustainability is incumbent on its ability to preserve water," Cunningham said.

David Arthur Sampson, senior sustainability scientist at Arizona State University's Global Institute of Sustainability, researched gray water through simulations in 2012 and found that an average household can save 18 to 35 gallons per day by using a gray water system.

"If you count just the water that's coming out of washing clothes, showers and baths, that can be almost 80 percent of the water you use in your house," he said. "If you were able to use that water for irrigation that would provide a substantial amount of water savings."

Sampson said that gray water hasn't caught on in the Phoenix metropolitan area like it has in Tucson, in large part because water rates generally are lower in the Valley.

"Water is too cheap right now," he said.

The gray water system at Reid Park Zoo's Learning Conservation Center complements a catchment system through which rain that hits the roof is used in its toilets, reducing the use of potable water inside by about half. Both systems tie into the zoo's overall conservation efforts, said Vivian VanPeenen, a zoo spokeswoman.

"The practice of conserving water and other natural resources is definitely effective for the zoo and the species we care for," she said.

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