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Plumbing & Gas guides

Most recurring plumbing compliance work is annual, standards-driven and record-heavy. Two of them account for the bulk of it: backflow device testing, which gets lodged with the water authority, and TMV servicing, which does not get lodged anywhere and so lives or dies on your own record.

Guides

Backflow prevention device testingAS/NZS 2845.3:2020 · Every 12 months from the test date TMV testing and servicing requirementsAS 4032.3:2022 · 12 months, plus a 5-yearly major service

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Last reviewed: September 2026. This page is general information for tradespeople and property owners, not legal advice. Rental and electrical safety laws change, and the requirements for an individual property can differ. Confirm the current position with your state regulator before you rely on it.