Is Collecting Rainwater Legal in Washington? (2026)
Partially — Collecting Rainwater is legal with restrictions in Washington as of 2026.
Quick Answer
Washington State allows rainwater collection but with restrictions under the prior appropriation water rights system. Collecting rainwater for personal use is generally allowed, but large-scale collection or sale may require water rights permits under RCW 90.03.
What the Law Says
Rainwater must be used on the property where it is collected. Rainwater can only be collected from existing structures that have another purpose other than rainwater collection.
— Washington Revised Code §90.03
| Category | Details |
|---|---|
| Collection Rules | Allowed for personal use; large-scale collection requires water rights. |
| Volume Limits & Permits | Sale of collected rainwater requires water rights permits. |
| Violation Penalties | Violations can result in fines and enforcement under water rights laws. |
| Pending Legislation | None known |
Enforcement Reality
Local Exceptions
None identified. State law applies uniformly across Washington. Local ordinances may still vary — check with your city or county government for any additional rules.
Bottom Line
Collecting Rainwater is legal with restrictions in Washington. This activity is permitted, but specific conditions apply. Violating those conditions can result in fines or criminal charges. Read the rules carefully and consult an attorney if unsure.
Washington vs. the Rest of the US
Across the US, collecting rainwater is fully legal in 29 states, restricted in 21, and illegal in 0. Washington falls in the RESTRICTED category.
View the full 50-state map →Reviewed by cross-referencing the cited state statute against current legislative databases and regulatory publications.
Sources & Verification
This page was reviewed by Ethan Harper by comparing the legal status against the cited state statute. AllowedHere is an informational resource and does not provide legal advice. Consult a licensed attorney for guidance specific to your situation.
Comprehensive Washington Legal Guides
Explore all related legal topics in Washington — statutes, penalties, and enforcement in one place.