Rainwater harvesting, a disruptive idea, catches on with businesses. CoB reporter Brett Walton responds to a recent article in the Guardian.
Last week, voters in Texas approved Proposition 6, a constitutional amendment creating a state water bank. The bank, seeded with $US 2 billion from state reserves, will finance projects in the $US 50 billion state water plan, released last year. But one proven idea was left out. Rainwater harvesting – the process of trapping and storing what falls from the sky and then using it on-site – was not a recommended strategy in the plan.
In an article posted to the Guardian’s Sustainable Business site, San Antonio-based journalist Greg Harmon cites my reporting on water prices in the United States to underscore a point about the water-saving practice that is catching on with businesses that operate large facilities, like the collection systems installed at Home Depot, Lowe’s, and Walmart.
“Walmart has a number of such systems including a Sam’s Club store in Fayetteville, Arkansas, that has cut its use of city water by an estimated 1.5 million gallons per year, according to the company. Those water savings are likely to pay off quickly as utilities raise their rates across the country in response to rising demand due to everything from rising populations in some areas, new EPA stormwater regulations, and the replacement of aging infrastructure.” –Greg Harmon, the Guardian
Indeed water rates are rising – though my annual survey looks at residential, not commercial rates. And 1.5 million gallons per year does seem like a large number. But the financial savings are tiny for the retail behemoth. The city of Fayetteville does not post its water rates online, but let’s assume a rate of $US 5 per 1,000 gallons, which is probably on the high side. That amounts to a savings of $US 7,500 per year for a company that rings up roughly $US 88 million annually in revenue at each of its 611 Sam’s Club stores.
Harman does hit on one point that is worth serious debate: how do decentralized systems such as rainwater harvesting fit into the existing business model for water utilities? The growing push for water conservation has forced utilities, which are in the business of selling water, to fiddle with their rate structures. More and more, utilities are recovering their costs through higher fixed fees. Water sales fluctuate, but the delivery systems – the pipes, pumps, and treatment plants – still have to be maintained and expanded to new homes.
Rooftop solar panels are causing a similar disruption for electric utilities. When people can generate their own power and store water in their own tanks, they send less money to Pacific Gas and Electric Co. or San Diego Public Utilities. Neither rooftop solar nor rainwater harvesting is at a scale right now to send shock waves through the system, but the ripples are already there.
Do you collect rainwater? What regulatory obstacles do you face? How much money do you save? Let me know directly by contacting Brett Walton or on Twitter @waltonwater or by commenting below.
–Brett Walton, Circle of Blue reporter