Rainwater Harvesting: Gresham vs Troutdale
How do rainwater harvesting rules compare between Gresham, OR and Troutdale, OR?
Gresham and Troutdale have similar restriction levels.
Gresham, OR
Multnomah County
Rainwater harvesting is legal and encouraged in Multnomah County. Oregon does not restrict residential rainwater collection under ORS 537. Portland's Ecoroof and Clean River Rewards programs provide stormwater fee discounts for rainwater capture. Oregon Plumbing Specialty Code (OAR 918-750) governs potable rainwater systems. Simple rain barrels require no permits.
View full Gresham rules →Troutdale, OR
Multnomah County
Rainwater harvesting is legal and encouraged in Multnomah County. Oregon does not restrict residential rainwater collection under ORS 537. Portland's Ecoroof and Clean River Rewards programs provide stormwater fee discounts for rainwater capture. Oregon Plumbing Specialty Code (OAR 918-750) governs potable rainwater systems. Simple rain barrels require no permits.
View full Troutdale rules →Key Facts Comparison
| Fact | Gresham | Troutdale |
|---|---|---|
| Legal Status | Permitted statewide | Permitted statewide |
| Rain Barrels | No permit needed | No permit needed |
| Indoor Plumbing | OPSC permit required | OPSC permit required |
| Rewards Program | Portland Clean River | Portland Clean River |
| State Law | ORS 537; OAR 918-750 | ORS 537; OAR 918-750 |
Highlighted rows indicate differences between cities.
Gresham FAQ
Can I install a rain barrel without a permit?
Yes, throughout Multnomah County. Only systems plumbed into the house (indoor use, toilet flushing, etc.) require permits.
Can I use rainwater for drinking?
Yes with proper filtration and UV treatment meeting Oregon Health Authority standards. Most residential rainwater systems stick to irrigation, laundry, and toilet flushing to avoid treatment costs.
Troutdale FAQ
Can I install a rain barrel without a permit?
Yes, throughout Multnomah County. Only systems plumbed into the house (indoor use, toilet flushing, etc.) require permits.
Can I use rainwater for drinking?
Yes with proper filtration and UV treatment meeting Oregon Health Authority standards. Most residential rainwater systems stick to irrigation, laundry, and toilet flushing to avoid treatment costs.
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