Washington Wood-Destroying Organism Licensing Requirements

Dampwood and subterranean termites, carpenter ants in moisture-heavy crawl spaces, and wood-boring beetles threaten Washington structures from Puget Sound to Spokane. WSDA does not fold wood-destroying organism (WDO) authority into PCO - General. WDO pesticide treatment requires PCO - Structural under WAC 16-228-1545. Complete real-estate transfer or refinance WDO inspections require separate Structural Pest Inspector (SPI) licensing with SPI company insurance distinct from commercial applicator FRIC rules.

This guide covers PCO Structural treatment scope, the SPI complete-inspection firewall, fumigation separation, commercial applicator and operator layers, exams, insurance, and recertification - without inventing SPI report form statutes or retention periods not verified in the Washington facts pack. Westside moisture markets drive carpenter ant and dampwood termite demand; eastside heated structures still generate termite pressure. WSDA's categories page notes naming changes effective January 1, 2026 - re-verify exam labels before long-horizon planning.

WAC 16-228-1545 defines PCO - Structural as control of structurally destructive pests including fungus, termites, carpenter ants, carpenter bees, and wood-boring beetles, plus specific WDO inspections. PCO Structural does not include fumigants.

What fits PCO Structural. Termite liquid and bait programs, carpenter ant structural treatments, fungus-related wood protection, carpenter bee and wood-boring beetle work in buildings when labels and WAC scope align.

What it excludes. Fumigants route to separate Space Fumigation / Soil Fumigation categories. General insect and rodent work remains PCO - General. Complete real-estate WDO reports route to SPI.

Exam and business layer. Pass Washington Laws and Safety plus PCO Structural at 70 percent. Exam fees: $25 paper session, $58 computer-based - confirm when scheduling. For-hire work requires Commercial Applicator License (joint company - person credential), UBI, FRIC or surety bond per WAC 16-228-1520, and Commercial Operator licenses ($85/year) with matching PCO Structural categories for applying employees.

Washington splits treatment from complete real-estate inspection authority. SPI credentials are required for complete WDO inspections for transfer or refinance. WSDA distinguishes SPI from PCO Structural, which allows specific WDO inspections under WAC 16-228-1545 but not the complete inspection track.

SPI licensing. Individual SPI license: $85/year per published schedule. Complete inspections require SPI company licensing with E&O or bond options on WSDA's SPI page - distinct from commercial applicator FRIC minimums. Confirm exam requirements and company steps on the WSDA Structural Pest Inspectors page; report form statutes and retention periods were not verified in the facts pack.

Market practice. Lenders and buyers in King, Pierce, Clark, and Spokane counties often ask which credential backs the report. Marketing complete pre-purchase reports requires SPI - not PCO Structural alone. Firms may hold both SPI for inspections and PCO Structural for treatment when each credential and insurance path is maintained separately.

PCO - General covers insects, spiders, birds, rodents, and animal pests in and around structures under WAC 16-228-1545 - but not structurally destructive pests reserved to PCO Structural.

Common mistake. A PCO General firm advertises termite baiting because it already holds a commercial applicator license. Category scopes are not interchangeable; enforcement compares advertised services to categories on the decision-maker's and each operator's credential.

Specific vs complete inspections. PCO Structural allows specific WDO inspections; complete real-estate reports require SPI. Operators may hold both PCO General and PCO Structural, but each category requires its own exam. Confirm current exam names on WSDA's categories page after January 1, 2026 C&T updates before marketing.

Both PCO - General and PCO - Structural exclude fumigants under WAC 16-228-1545. Structural, commodity, or soil fumigation requires separate fumigation category exams on WSDA's categories page - not PCO Structural.

Fumigation demands tarping, aeration monitoring, and emergency response beyond liquid and bait workflows; many firms subcontract. Quotes should distinguish non-fumigant WDO treatments (PCO Structural) from fumigation proposals. Confirm post-2026 fumigation exam labels on WSDA's site before adding fumigation lines.

Commercial Applicator License. Required for applying pesticides to another's property for hire. Joint company - person credential held by the pesticide decision-maker. $250/year ($27 each additional power equipment unit). Requires Laws and Safety plus PCO Structural, UBI, FRIC or bond, and company application.

Commercial Operator License. Applying employees need operator licenses at $85/year on the company WSDA record with matching PCO Structural categories.

Recertification. 40 department-approved credits every five years (max 15/year) per WSDA Recertification by Credit and RCW 15.58.233; alternatives include retesting or reciprocation at cycle end. Annual license renewal is separate.

Reciprocity. Case-by-case exam waiver paths may exist, but no for-hire treatment before Washington credentials and financial responsibility issue. Contact WSDA Licensing (877-301-4555 / license@agr.wa.gov) - no published reciprocal origin state list was verified.

Commercial applicators need FRIC or surety bond meeting WAC 16-228-1520: $50,000 personal injury and $50,000 property damage, or $100,000 combined, max $5,000 deductible - or $100,000 surety bond under RCW 17.21.160/.170.

Confirm liability coverage includes PCO Structural services sold. SPI complete-inspection firms need separate E&O or bond options on WSDA's SPI page - commercial applicator FRIC does not substitute.

WDO inspection report form statutes, disclosure timelines, and retention periods were not verified in the facts pack - confirm on official WSDA SPI and real-estate regulatory materials before building templates. Commercial applicator and operator licenses renew annually; SPI individual license $85/year.