Rainwater harvesting: to require or not to require
Wednesday, July 15th, 2009This week, the DJC ran an excellent article from Arthur H. Rotstein with the Associated Press called “Commercial projects in Tucscon must start harvesting rainwater.” The article says that the Arizona city has enacted the nation’s first municipal rainwater harvesting ordinance for commercial projects. The ordinance requires developers building new business, corporate or commercial structures to supply half of the water needed for landscaping from harvested rainwater starting next year.
Apparently, landscaping accounts for about 40 percent of water use in commercial
development and for 45 percent of household water consumption in Tucson. That. Is. Crazy.
The article also mentions that a half-dozen other communities in Arizona are looking at replicating the approach, and that rural Santa Fe County in New Mexico has required harvesting using cisterns or similar structures for commercial and residential development since last year.
Which brings me to the next question: why isn’t this a requirement everywhere? Water is cheap, yes. But even though it is cheap, it still costs money. If Tucscon - which the article says gets 12 inches of rain a year - requires rainwater harvesting, why don’t we? (Other than little details like the state owning the rain that drops down from the sky….)
Now I know Tucson and Seattle are very different. I know Tucson uses so much water on landscaping because the city is in a desert, which means for most anything to grow, it is going to need extra water. But the underlying principal is the same. Water is a free resource. When water falls on the ground, it flows along roadways, picking up dirty icky things like metals and nutrients, eventually ending up in a water body like the Puget Sound, where it
does real damage or at a treatment plant, where it goes through an extensive process to get clean. So why don’t we, as a country, require that at least some of that water is captured and used for something productive?
It just seems like a really wasted resource.
Where am I wrong here? Please tell me why this would not work.
By the way, water is going to become an even greater issue of importance as more people move to the Pacific Northwest. I wrote this article a couple weeks ago that discusses the challenges between the desire to get off the water grid and traditional infrastructure.
In that story, a number of experts from our region discussed where we are going with water treatment and the difficulties that lie ahead. It covers a range of opinions but all speakers could agree on one thing: water needs to be more expensive for change to happen.
Kurt Unger of the Department of Ecology pretty much spoke for the crowd when he said “Water is too damn cheap… We need to assess a fee on water to enable so many more things to happen.”

