An educational, cited reference for homeowners — not a claim that ClickSeptic services Washington today. ClickSeptic has zero live markets anywhere yet.
Short answer: Washington's Department of Health (DOH), through the State Board of Health, sets minimum statewide design, installation, and maintenance standards for on-site sewage systems (OSS) in Chapter 246-272A WAC, adopted under authority of RCW 70A.100 (formerly 70.118). Day-to-day permitting, inspection, and enforcement are delegated to local health jurisdictions (county health departments), which may adopt local rules at least as strict as the state minimums. So Washington is a hybrid: state-set floor, county-run administration.
Last updated: September 2026. This page summarizes public Washington regulatory information for homeowner reference and is not legal advice — always confirm current requirements directly with the state or local agency cited below. ClickSeptic has not launched in any market and has zero operators onboarded anywhere today; this page does not claim ClickSeptic provides service in Washington or anywhere else.
Washington's Department of Health (DOH), through the State Board of Health, sets minimum statewide design, installation, and maintenance standards for on-site sewage systems (OSS) in Chapter 246-272A WAC, adopted under authority of RCW 70A.100 (formerly 70.118). Day-to-day permitting, inspection, and enforcement are delegated to local health jurisdictions (county health departments), which may adopt local rules at least as strict as the state minimums. So Washington is a hybrid: state-set floor, county-run administration.
Washington is actively moving toward a codified statewide requirement: 2024 Board of Health revisions to WAC 246-272A-0270 add a property-transfer inspection provision, phased in with a statewide effective date of February 1, 2027, generally requiring sellers to obtain a third-party OSS inspection before transfer (with waiver options for recent documented compliance). Ahead of that date, numerous counties (King, Snohomish, Island, Skagit, and others) already impose their own mandatory point-of-sale septic inspection ordinances independent of the state rule.
WAC 246-272A-0270 codifies an inspection schedule, not a fixed pumping calendar: gravity tank-and-drainfield systems must be inspected at least every 3 years, and other system types (pressure distribution, alternative/aerobic) at least annually. Actual pumping is triggered by measured solids/scum accumulation (e.g., sludge/scum levels approaching baffles), which DOH and county guidance typically translates to roughly every 3-5 years for typical households.
OSS construction/repair permits are issued and enforced locally by county health departments (local health jurisdictions) under authority delegated by DOH via WAC 246-272A, not by a single state permitting office; DOH maintains statewide registries of approved products, tanks, and additives but does not itself issue individual homeowner permits.
Washington is one of the few states where the state health agency itself is phasing in a mandatory statewide point-of-sale septic inspection rule (effective Feb 1, 2027) rather than leaving that decision entirely to counties, following years of county-by-county patchwork requirements.
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