Washington Septic & Well Water Rules
In Washington, local health jurisdictions (LHJs) permit and oversee on-site sewage systems under WAC 246-272A, with Department of Health guidance.
This is a short state page. It covers only the facts we've verified from official sources so far.
Required inspections
- Owners must have routine inspections every three years for conventional gravity systems and every year for other system types. LHJs may require more.
- Inspections must cover tanks, lids and risers, signs of failure, and available records (WAC 246-272A-0260).
- LHJs approve the installers, pumpers and maintenance providers allowed to do inspections, and some let homeowners get certified to inspect their own system.
Frequently asked questions
How often must a septic system be inspected in Washington?
Every three years for conventional gravity systems and every year for all other types, under WAC 246-272A.
Sources
Last checked: October 21, 2026
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