2023 Washington Code 70.79.070 – Existing installations — Conformance required

2022 Washington Code 70.79.070 – Existing installations–Conformance required

2020 Washington Code 70.79.070 – Existing installations — Conformance required

2019 Washington Code 70.79.070

2018 Washington Code 70.79.070 – Existing installations — Conformance required

2016 Washington Code 70.79.070 – Existing installations–Conformance required–Miniature hobby boilers

2015 Washington Code 70.79.070 – Existing installations–Conformance required–Miniature hobby boilers

2014 Washington Code 70.79.070 – Existing installations — Conformance required — Miniature hobby boilers

2013 Washington Code 70.79.070 – Existing installations — Conformance required — Miniature hobby boilers

2009 Washington Code 70.79.070 – Existing installations — Conformance required — Miniature hobby boilers