Ch. 70.79 RCW + ch. 296-104 WAC; inspection frequencies in WAC 296-104-100 (last amended eff. Sep 1, 2015). Enforced by L&I Boiler and Pressure Vessel program issues certificates of inspection; inspections by L&I inspectors or commissioned insurance-company/operating-company special inspectors (RCW 70.79.130). Verified on the primary source, re-checked weekly.
Certificate inspections: power boilers internal and external annually; low-pressure heating boilers external every two years, internal generally every fourth year; hot water heaters external every two years; unfired pressure vessels every two years.
Source: primary document
Statewide layer. County and city amendments sit on top; the building view resolves them from your ZIP.
In force; no pending ch. 296-104 rulemaking found (L&I rulemaking page did not render; 2026 fee rule excluded boilers)
There is no federal boiler certificate; the state program below is the whole obligation, with the ASME Boiler and Pressure Vessel Code and the National Board Inspection Code as the referenced standards.
Ch. 70.79 RCW + ch. 296-104 WAC; inspection frequencies in WAC 296-104-100 (last amended eff. Sep 1, 2015). Certificate inspections: power boilers internal and external annually; low-pressure heating boilers external every two years, internal generally every fourth year; hot water heaters external every two years; unfired pressure vessels every two years.
L&I Boiler and Pressure Vessel program issues certificates of inspection; inspections by L&I inspectors or commissioned insurance-company/operating-company special inspectors (RCW 70.79.130).
Nothing is scheduled. The rule above stays in force until the state adopts a newer edition or amends the program; AHJ Radar re-checks the source weekly.
One address, every authority that can cite it, and a record of who saw what. Cancel anytime. Public pages stay free.