Jefferson County, Washington septic permits and requirements

Permitting authority

Jefferson County Public Health — Environmental Public Health, On-Site Sewage Program

Jefferson County Environmental Public Health, 617 Sheridan Street, Port Townsend, WA 98368; 360-385-9444. The On-Site Sewage Program reviews and issues installation and repair permits, inspects installations, enforces state/local code, and certifies local septic professionals.

Washington state/local framework

Washington Department of Health assigns approval authority for onsite sewage systems with design flows through 3,499 gallons per day to the local health officer. Local health jurisdictions therefore administer the property-level permit, inspection, and management process, while larger systems can fall under state jurisdiction.

County Public Health issues installation and repair permits

Jefferson County’s On-Site Sewage Program lists review and issuance of installation and repair permits among its core program activities, together with installation inspection, complaint investigation, monitoring, education, and enforcement of state and local onsite-sewage codes.

Current local code

Jefferson County publishes Onsite Sewage Code 8.15 with revisions effective April 1, 2025. Applicants should use the current county code and Public Health permit process rather than older local septic instructions.

Designers are state licensed; installers and O&M specialists are county certified

Jefferson County states that onsite sewage designers are licensed by Washington State and may design in the county. Septic installers and operations-and-monitoring specialists must be certified by Jefferson County Environmental Health; out-of-county contractors still need Jefferson County certification to perform those services locally.

Routine inspection frequency depends on system type

Jefferson County requires regular operation-and-monitoring inspections. Conventional gravity systems are listed on a three-year interval, while pump-to-gravity, pressurized systems, sand filters, mounds, aerobic treatment units, proprietary devices, and food-service systems are listed for annual inspection.

Some homeowners may inspect eligible systems after authorization

Jefferson County allows qualifying owners of certain residential conventional gravity, pressure distribution, mound, and sand-filter systems to perform homeowner inspections after meeting the county’s eligibility, training, record, and authorization requirements. Other system types require professional inspection.

Septic permit records are available online

Jefferson County provides selected septic case-file records online, including available permit applications, approved permits and conditions, approved designs, soil reports, as-builts or record drawings, construction reports, and county correspondence. Environmental Health can provide additional file information when the online record is incomplete.

Official sources

SepticScope summarizes public-agency information for planning purposes. The permitting agency's current instructions control if they differ from this guide.

Report outdated county information

Septic rules, forms and agency pages can change. If you find a broken official link or a county requirement that has changed, send SepticScope feedback and include the current local government source.