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MELISSA BLOCK, HOST:

We're going to stay in Silicon Valley for this next story. People there will soon have a new source of water. As you might guess, given the location, this involves a high-tech solution. And this new water source is raising some eyebrows and wrinkling some noses.

Here's Amy Standen from member station KQED.

AMY STANDEN, BYLINE: If radio could transmit odor you'd already know where this water is coming from. I smell something now.

MARTY GRIMES: Well, we happen to be very close to a landfill.

STANDEN: That's Marty Grimes, a spokesman for the brand new, $68 million Silicon Valley Advanced Water Purification Center in San Jose. And we're not just close to a landfill. There's also a wastewater treatment plant across the street. And that is where this water comes from: a place that smells a lot like a toilet.

GRIMES: Gosh, do you have to put it that way?

(LAUGHTER)

STANDEN: Yes.

(LAUGHTER)

GRIMES: Wastewater is not necessarily a pretty business. But let me tell you, the result from our plant is going to be pure, clean water.

STANDEN: And that's why it's unfair, really, to have told you the whole sewage thing right off the bat, because when this plant starts up later this year, it will be doing some of the most state-of-the-art water filtration done anywhere in the country. And naturally, that is what engineers emphasize here when they give you the tour.

CRYSTAL YEZMAN: So the water comes from the auto strainers, where it's strained down to 300 microns.

STANDEN: That's Crystal Yezman, who works here.

YEZMAN: Of course, one micron is...

STANDEN: She patiently explains to me that one micron is one thousandth of a millimeter. So 300...

YEZMAN: It's about the size of a human hair.

STANDEN: So that's step one.

YEZMAN: Downstream of that are cartridge filters to get it ready for reverse osmosis.

STANDEN: This process gets rid of the tiniest of contaminants, like viruses or pharmaceuticals. Then, finally, the water gets zapped by ultraviolet rays which scramble the DNA of anything that might be living in.

Have I mentioned it yet? This water is clean.

YEZMAN: The department of health has acknowledged that we are removing 99.99 percent of all pathogens.

STANDEN: Cleaner than snowmelt.

YEZMAN: Almost as good as what they're getting in their sink right now.

GRIMES: It could be even better.

STANDEN: I'm making such a big deal out of this because despite how clean this water is, no one is going to drink it. It's going into segregated pipes bound for landscaping and industrial use only. But that may have to change one day. Because, like a lot of places in the West, water supplies here are drying up. Recycled water is the future if enough people can be convinced that it's OK to drink.

Brent Haddad, of University of California, Santa Cruz, has some advice on how to do that.

BRENT HADDAD: You have to break the memory or the line of history of the water.

STANDEN: This is not an engineering challenge, he says. It's a psychological challenge. Water managers, he says, need to rewrite the history of the water. Edit out the part about sewage. Help people forget that part. And one way to do this is to take recycled water and put it back into nature - say, a river.

HADDAD: That river is something that's comforting to people and we don't have to think anymore that it was passing through a city. We just begin the history of that water in the river itself.

STANDEN: This, of course, happens in nature every day. Just look at the Mississippi River. Full of treated sewage water that people downstream clean and then drink. And it's happening in Southern California, too, that's home to the largest potable water recycling facility in the world where Mike Markus is general manager.

MIKE MARKUS: We put it back into the ground, and then eventually it becomes part of the water supply.

STANDEN: Instead of a river, his district cleans treated sewage and then pumps it underground, where it mixes with other water. Then, they pump it back up, treat it all over again, before piping it to peoples' houses. And even with this crazy, Rube Goldbergian system, getting the public to accept recycled water took lots of meetings.

MARKUS: We went to our local state elected officials.

STANDEN: They talked to anyone who would listen.

MARKUS: We went to the health and medical community...

STANDEN: The chamber of commerce, schools...

MARKUS: Into the minority community.

STANDEN: Environmentalists, rotary groups.

MARKUS: We talked to the Sons and Daughters of the American Revolution. And scouting troops, anyone who would want to hear or receive a presentation.

STANDEN: This whole process, it took nine years. The irony, of course, is that when you put recycled water back into the ecosystem, it actually gets dirtier and has to be treated all over again. So I asked Markus, what's it like to put that beautiful, clean water into a hole in the ground?

MARKUS: How does it make me feel? Frustrated, I guess you might say.

STANDEN: So he reminds himself winning people over to recycled sewage water is a process, one that's just beginning here in Silicon Valley. For NPR News, I'm Amy Standen in San Jose.

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