Rainwater Harvesting: Redmond vs Renton
How do rainwater harvesting rules compare between Redmond, WA and Renton, WA?
Redmond and Renton have similar restriction levels.
Redmond, WA
King County
Rainwater collection is legal and encouraged in Redmond per Washington Department of Ecology 2009 guidance; systems for non-potable outdoor use require no permit, while plumbed indoor uses require building permits.
View full Redmond rules →Renton, WA
King County
Washington allows rooftop rainwater harvesting without a water right per Ecology policy (POL-1017). Renton encourages collection for irrigation. Cisterns over 5,000 gallons require building permits.
View full Renton rules →Key Facts Comparison
| Fact | Redmond | Renton |
|---|---|---|
| Legal Status | Permitted statewide | - |
| Rain Barrel Permits | Not required | - |
| Ecology Policy | 2009 guidance | - |
| Plumbed System Permit | Required | - |
| Rebate Program | Stewardship Partners | - |
| State Policy | - | Rooftop harvesting allowed without water right |
| Authority | - | WAC 173-500, Ecology POL-1017 |
| Rain Barrel Limit | - | Under 200 gallons no permit |
| Cistern Limit | - | Over 5,000 gallons needs permit |
| Potable Use | - | Requires DOH review |
Highlighted rows indicate differences between cities.
Redmond FAQ
Can I collect rainwater in Redmond?
Yes. Washington Ecology confirmed rooftop rainwater collection is legal with no permit required for outdoor non-potable use.
Do I need a permit for a large cistern?
Yes, if plumbed into a structure or used indoors. A building/plumbing permit from Redmond Development Services is required.
Renton FAQ
Can I collect rainwater from my Renton roof?
Yes, rooftop rainwater harvesting is allowed without a water right under Washington state policy. Rain barrels under 200 gallons generally need no permits.
Do large cisterns need permits?
Cisterns over 5,000 gallons or those integrated into household plumbing require building and plumbing permits from Renton CED. Backflow prevention is required.
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