Recommendations are independently chosen by Reviewed’s editors. Purchases you make through our links may earn us a commission.
This past winter, California recorded its lowest winter snowpack ever. Governor Jerry Brown responded with an executive order requiring a 25-percent reduction in urban water use statewide. News outlets promptly turned around and pointed to California’s lawns and desert communities as evidence that residents were in a state of drought denial.
Well, okay. As the west heads into the fourth year of what some experts are calling a mega-drought, there’s no question that most Californians—myself included—can do more to conserve water. But there’s also no denying that citizens of other states are just as wasteful (if not more so) with this precious resource.
Many regions of the country rely on regular rainfall and gushing rivers to keep their reservoirs brimming. For them, water costs less than a penny a gallon—it’s even free when drawn from underground. But with climate change threatening resources we once thought reliable, it’s not just residents of the parched west who are ill-prepared for an epic drought.
“Water-stressed areas like California are a prediction of what’s going to happen in other places,” suggested Laura Allen, an environmental scientist and author of The Water-Wise Home. She points to Georgia's 2006–2007 drought as a prime example of a state caught flat-footed.
“With a changing climate, we don’t know how reliable our water supply is going to be in the future,” Allen added. “In the past, we’d just pump more groundwater or get our water from a different river supply. But as a country we aren’t going to be able to consume water like we have been.”
That's why it was refreshing to hear Los Angeles City Councilman Paul Krekorian’s call for the city to develop new standards for greywater treatment that would encourage broader use.
“We need to explore every reasonable water conservation option that will help us get through this terrible drought and make our city more sustainable,” the councilman said in a statement. “Using greywater systems in homes throughout Los Angeles just makes sense.”
What is greywater?
Although there are varying definitions of greywater, in California it describes the wastewater from showers, bathroom sinks, and washing machines. Overall, it accounts for 56 percent of non-landscape household water use, according to WaterNow. Greywater is not from kitchen sinks or dishwashers, much less from toilets—that's usually described as "blackwater," and should go straight to the sewer.
Homeowners who collect greywater typically use it for outdoor irrigation, though not for growing foods that come in contact with the soil, such as root vegetables. Greywater can also be used for washing your car or flushing toilets.
How can you use greywater?
Even if your residence isn’t directly impacted by water shortages, a home greywater system can lessen your water footprint but also allow you to become less dependent on the tap. Perhaps the easiest place to start is in the laundry room.
“A washing machine greywater system is definitely the easiest to set up,” said Allen, who added that by starting in the laundry room you can access the greywater without changing your household plumbing. Check out a simple how-to from This Old House (guest-starring Allen herself) below.
Greywater Action, a collaborative of educators dedicated to promoting water conservation, says that a straightforward laundry-to-landscape greywater system can run between $100 and $250 for the materials. Installation costs can range $700 to $2,000 depending on the location of the laundry room and size of the yard, but homeowners comfortable with DIY work may be able handle most of the install on their own.
Before you get too far along in planning your own greywater system, be sure to check for local codes that may regulate greywater use in your area. According to Greywater Action, there are currently no national standards for regulating greywater collection and use. Some Midwestern states have no definition for greywater, for instance, while a few states (notably, the tri-state region) regulate greywater just like septic water.