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Tried drought-proof irrigation?

  • Judy Mazzeo checks one of her emitter boxes that is dug into the mulch areas of her Petaluma front yard. Greywater that comes from her washing machine flows into a series of these emitters and is absorbed into the garden areas around them. According to Mazzeo she has diverted 8,469 gallons of water since 11/2/2012.

Cold, fresh water rushes out of the tap. You wash your hands with it. The soap and grime drains away.

Normally, that used water is piped straight to a wastewater treatment facility, where it is filtered, kept in a pond and disinfected ?— all at great expense. But if the ideas of a small-but-growing minority take hold, it could be diverted to water a backyard fruit tree instead.

This is "graywater," a term used to describe water that is not fresh but not toxic either — such as the used water coming from a bathroom sink, shower drain or laundry machine. It's not potable, of course, but plants like it just fine.

With that in mind, why shouldn't residents of single-family homes, especially those living in dry climates like Petaluma's, be watering plants while they do their laundry?

According to James Johnson, a senior environmental health specialist for Sonoma County's Permit and Resource Management Department, graywater is an idea whose time has come. Although the concept has been around for several years — the East Bay's "Greywater Guerilla Girls" were rebelliously installing not-to-code plumbing systems in the late 1990s — California only recently updated its building codes to make it easier to install such systems legally.

According to Johnson, the state updates its codes every three years, and new rules that took effect at the beginning of this year have "given us a little bit more to work with."

Today the regulations include a whole section devoted to graywater, which the state says can come from numerous sources including swimming pool backwash, foundation drainage or cooling runoff from an air conditioner. Such water, once captured, can be stored only briefly and used for specific purposes.

"You can even bring it back into the house to flush the toilet," Johnson said. If done properly, a typical household can reduce water use by about one-third using a graywater system.

In this time of sustained drought, such recycling techniques are considered a good way to recapture precious water. County leaders know this, Johnson said.

"My director came to me, about two weeks ago, and he provided the Board of Supervisors update that tells people in the county what's going on," Johnson said. Their motto: "Retain it! Don't drain it!"


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