Yes, rainwater collection is legal in Oregon, but subject to specific restrictions under state water rights laws and local ordinances. Residents may collect rainwater for non-potable uses without a permit, provided systems comply with Oregon Department of Water Resources (OWRD) guidelines and local building codes. Recent 2026 amendments to OWRD’s Water Rights Technical Bulletin clarify exemptions for small-scale residential systems under 5,000 gallons, though commercial or large-scale projects require prior authorization.
Key Regulations for Rainwater Collection in Oregon
- Permit Exemptions: Systems under 5,000 gallons for non-potable uses (e.g., irrigation, toilet flushing) are exempt from water rights permits under OWRD’s Exempt Use Rules (OAR 690-007-0005), effective 2026. Larger systems or potable uses trigger mandatory permitting.
- Local Ordinances: Counties like Multnomah and Washington impose additional restrictions via building codes, requiring permits for structural modifications or connections to plumbing systems. Portland’s Bureau of Development Services mandates compliance with stormwater management plans.
- Water Quality Standards: Collected rainwater must meet Oregon Health Authority (OHA) standards if used for drinking. OHA’s Drinking Water Program (OAR 333-061) prohibits untreated rainwater for potable purposes unless treated via certified filtration systems.