In Israel you need dozens of official permits to reuse water except in your own home or factory, when it is your own business. There are plumbing regulations but except at the building permit design approval, they are unenforceable and no one will knock on the door to examine the plumbing. Not so in the USA. This is the reason water reuse is illegal in the USA and this the origin of the Greywater Guerrillas, a team focused on promoting and installing clandestine plumbing systems that recycle gray water — the effluent of sinks, showers and washing machines — to flush toilets or irrigate gardens. Although gray water use is legal in California, systems that conform to the state’s complicated code tend to be very expensive, and Ms. Allen and her fellow guerrilla, Cleo Woelfle-Erskine, are out to persuade the world that water recycling can be a simple and affordable option, as well as being a morally essential one.
They are part of a larger movement centered in the West — especially in arid regions like Arizona, New Mexico and Southern California — that includes both groups that operate within the law and ones that skirt it. The goal is the reuse of home gray water as a way to live within the region’s ecological means. Using their own experience and contributions from others, they have just published a do-it-yourself guide to gray water systems that is also a manifesto for the movement, “Dam Nation: Dispatches From the Water Underground.”In 1994, California became the first state to establish guidelines for gray water use — as most other states have since — and it has become a leader in building industrial-scale gray water systems. The town of Arcata, for example, has an extensive system that serves the entire population of 17,000, and even the state’s oil refineries have gray water systems.
But many gray water advocates say that California’s plumbing code — which stipulates things like pipe sizes, burial depths and soil tests based on rules established for septic systems — is prohibitively complicated for private homeowners interested in recycling gray water, and that its requirements are prohibitively expensive.
“The code is so overbuilt that I’m beginning to think it’s better to just have everyone do it bootleg,” said Steve Bilson, the founder of ReWater Systems, a company that has installed around 800 code-compliant gray water systems at a cost of about $7,000 each, and who worked as a consultant on California gray water legislation in the 1990s.
As a result, many homeowners have installed unpermitted, illegal plumbing, relying on techniques developed by covert researchers like the Greywater Guerrillas. (It is difficult to know how many, since these systems are not registered with any government or organization, but Ms. Allen said that based on her observations there are probably around 2,000 homes equipped with gray water systems, a few legal but most illegal, in the Bay Area alone.)
On a recent afternoon, Mr. Woelfle-Erskine stood in the backyard of the Haut House and explained how one of the half-dozen gray water systems there works. A pipe running from the house deposits shower and sink water into an elevated bathtub in the yard that is filled with gravel and reeds, and the roots of plants begin filtering and absorbing contaminants. The water then flows into a second, lower, tub, also containing a reedbed, before flowing into a still-lower tub of floating water hyacinths and small fish. We’ve had the water tested,” Mr. Woelfle-Erskine said, “and it’s clean — there’s just a little phosphorous left, which the plants in the garden actually like.” Through trial and error, Mr. Woelfle-Erskine and Ms. Allen have found what they say is the best way to spread wastewater into the gravel beds (through a screened milk crate) and which plants best clean the water while not growing so vigorously as to block pipes (cattails).
Although this Rube Goldberg setup, known as a constructed wetland, cost only about $100 to build, it represents a pinnacle of gray water system design, which is usually far more modest, according to Art Ludwig, an ecological systems designer in Santa Barbara. (Mr. Ludwig’s Web site, graywater.net, offers a practical introduction for do-it-yourselfers.) The vast majority of systems, Mr. Ludwig said, “cost less than a hundred bucks — it can be just a hose.” For example, a hose connects the sink to the toilet tank to create a gray-water toilet in one of the Haut House bathrooms.
In spite of the ad hoc nature of many illegal systems, Mr. Ludwig said, he has “never heard of a single case of health problems from using gray water, ever.” Similarly, Simon Eching, the chief of program development at California’s Department of Water Resources — the body that drafted the state’s gray water code — said he knew of no health issues arising from gray water use in California.
But Mr. Ludwig’s Web site also points out that there are a number of potential pitfalls. He strongly discourages ponds of exposed water like the one fed by the constructed wetland in Ms. Allen’s backyard, for example, because they can draw mosquitoes that carry disease. He cautions against crossing plumbing lines and contaminating clean water; using gray water in sprinkler systems or on fruits and vegetables that are eaten raw (it should only be used to irrigate roots); and allowing water contaminated by toxic cleansers, soiled diapers or contact with people who have infectious diseases to enter the gray water system.





























