During a prolonged drought in the early 1990s, L.A.'s Department of Water and Power and Department of Public Works conducted an ambitious experiment. In eight homes, including those of several elected officials, they installed "gray water" equipment that diverted the outflows from washing machines, showers, bathtubs and bathroom sinks to irrigate lawns and gardens outside the homes.
Participants in the program were happy with the results, and the test was officially proclaimed successful in a 21-page research report that found the installations reduced water consumption by about 50% per household on average. No human disease pathogens were found in the outside drainage areas.
Now, the drought is back, the report forgotten, and here we are again, facing another statewide water shortage with river flows at record lows and L.A. residents facing mandatory 15% usage cuts. So what happened to the simple plumbing trick that could save so much water?
What happened was that state health and housing officials, asked in 1992 by the Legislature to draw up a permit code to regulate and legalize gray water use, instead presented a statute so laden with oppressive regulations that few Californians have installed systems. Appendix G of the state plumbing code requires that gray water systems not only get costly permits and have extensive filtering systems but that they also be installed 9 inches underground -- too deep to irrigate most plantings.
In the entire state, only an estimated 200 legal gray water systems have been built. The draconian permitting process has driven gray water, literally as well as figuratively, underground. As many as 1.7 million gray water outlets are running illegally in California, according to Santa Barbara gray water guru Art Ludwig, whose Oasis Design website is a leading resource for gray water research, lore and history.
In official state language, these unofficial gray water systems are "unapproved auxiliary water supplies." But none of the owners has been prosecuted. Northern California even has its "gray water guerrillas," who help homeowners all over the state to construct their own unpermitted systems. "It's a benign conspiracy," says San Diego County gray water expert Steve Bilson.
At the heart of the official obstructiveness is the Sacramento bureaucracies' unproven suspicion that gray waste water carries disease. "They became obsessed with irrelevant risks," Ludwig says. "They miss the big thing -- pollution by industry -- and focus on this."
He says the Centers for Disease Control has found no human disease transmissions from gray water irrigation.
Bilson suggests that state officials were originally overly cautious because of major ground-water pollution issues of the early 1990s -- such as factory-site perchlorates and MBTE from gas station storage tanks.
Water expert Larry Farwell, who participated in the 1990s state safety discussion, said, "Nothing is cuter than two kids bathing in a tub together, but once you pull the plug, they say you have toxic waste."
He estimates that extensive gray water recycling could save more than 16% of the state's residential water use.
That suspicion may be why state Sen. Alan Lowenthal (D-Long Beach) calls his new bill to revive gray water irrigation the "Shower to Flower" law. The January legislation is now going through a state health and safety agency review process similar to that which gutted its predecessor. "This time we hope we can convince the Building Standards Commission," he said.
State officials recently quoted by The Times say that there's little research to prove gray water is safe.
They seem to have missed Los Angeles' 1992 $500,000 study by San Francisco consultant Bahman Sheikh, which did exactly that. There's a pending $450,000 "Long Term Effects of Landscape Irrigation Using Household Graywater" study by the Virginia-based Water Environment Research Foundation whose full results come in 2011. Its preliminary results may be out in June. The state could report its new guidelines in May, however.
The basic appeal of gray water is its utter simplicity. Just pipe your washing machine, bath and bathroom sink outflow onto your lawns and garden. They flourish, as detergents and organic dirt particles become plant nutrients.
Arizona, Texas, New Mexico and Montana have much more generous laws on gray water irrigation. "The state's challenge is this time to do gray water right," says Peter Gleick, of the prestigious Pacific Institute. "We have to match the quality of water available to our needs. We can't go on using scarce potable water for everything."
Andy Lipkis, of L.A.'s Tree People, suggests that retrofitting hundreds of thousands of Los Angeles low-rise apartments and single-family homes with gray water plumbing, besides saving a lot of water, could provide thousands of new, well-paying jobs.