Portland, OR Landscaping Rules: Rainwater Harvesting (2026)
Key Facts
- Cistern height for unlimited setback placement
- 6 feet or less
- Encroachment cap for taller cisterns
- 20% of setback depth
- Minimum lot-line clearance (taller cisterns)
- 3 feet
- Plumbing permit required
- City Code § 25.05.010
- Zones covered
- Single-dwelling R zones (Title 33.110)
Summary
Portland's zoning code lets water collection cisterns 6 feet or less in height extend fully into required side and rear setbacks in single-dwelling zones, while taller cisterns face the standard 20 percent setback encroachment limit and a 3-foot lot-line buffer.
The following minor features of a building may extend into the entire required building setbacks: a. Utility connections attached to the building that are required to provide services such as water, electricity, and other similar utility services; b. Gutters and downspouts that drain stormwater off a roof of the structure; c. Stormwater planters that are no more than 2-1/2 feet above the ground; d. Water collection cisterns that are 6 feet or less in height;
Full Breakdown
Portland's zoning code (Title 33.110.220) governs where rainwater cisterns sit relative to property lines in single-dwelling zones. Cisterns 6 feet or less in height may extend into the entire required setback: no distance-from-lot-line limit applies. Larger cisterns count as a minor projection capped at 20 percent of the setback depth and must stay at least 3 feet from any lot line. Separately, Title 25.05.010 requires a plumbing permit from Portland Permitting & Development before installing, altering, or repairing a rainwater harvesting system's cisterns, pipes, and pumps. Historic-district properties face additional screening and color-matching standards under 33.218.100.
Violations & Fines
Installing an oversized or improperly placed cistern violates the zoning setback standards enforced by Portland Permitting & Development; installing a rainwater harvesting system without the required permit under Title 25.05.010 can trigger a stop-work order and correction notice.
Frequently Asked Questions
Do I need a permit to install a rain barrel in Portland?
How close to my property line can a rainwater cistern sit?
Sources & Official References
Other rules in Portland
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