Rainwater harvesting at home given a ‘thumbs up’
Thursday, October 15th, 2009Jay Manning’s last official act as director of the Washington Department of Ecology was to announce that a water right will not be required to collect rainwater from the roof of a building.
It has been a bone of contention among some folks that state water law appears to require a water rights permit for the diversion of “water resources,” which is defined as “all waters above, upon, or beneath the surface of the earth, located within the state and over which the state has sole or concurrent jurisdiction.”
But state water law also gives the director of Ecology broad discretion to write regulations in the public interest.
Ecology specifically recognizes that rainwater harvesting can be a tool to manage stormwater. See Ecology’s paper on this subject.
In a one-page statement (PDF 124 kb), Manning declared:
“The on-site storage and/or beneficial use of rooftop or guzzler collected rainwater is not subject to the permit process of RCW 90.03.”
The statement leaves an avenue for the state if officials encounter a situation in which rainwater harvesting could affect stream flows or someone’s existing rights:
“If and when the department determines that rooftop or guzzler rainwater harvesting systems are likely to negatively affect instream values or existing water rights, local restrictions may be set in place to govern subsequent new systems.”
What conditions will apply to prevent possible abuse?
“To qualify as rooftop collected rainwater, the roof collecting the rainwater must be part of a fixed structure above the ground with a primary purpose other than the collection of rainwater for beneficial use. A guzzler is a device used to catch and store rainwater to provide drinking water for wildlife, livestock or birds.”
The statement includes this note:
“This policy supersedes any previous policy/interpretive statement, focus sheet or other stated Ecology viewpoint with which it may conflict.”
Josh Baldi, special assistant to the director of Ecology, said his agency conducted an analysis to measure the potential effects of the new policy. Because of cost, rainwater is not likely to be collected where it would create a problem, he said at a meeting of the Puget Sound Partnership’s Ecosystem Coordination Board.
“Most of the areas where rainwater collection makes economic sense are places where it also makes environmental sense,” he explained.
See also “Rainwater Collection to Augment Water Supply” and “Rainwater Collection as a Sound Investment.”
The agency is working with state plumbing experts to establish a registration program for large rainwater-harvesting systems. Registration would not be required for rain barrels or other small systems. See “Focus on Rainwater Interpretive Policy” (PDF, 152 kb).





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