The change, in one paragraph
From 1 December 2026, Safe Work Australia replaces the Workplace Exposure Standards list with the Workplace Exposure Limits list. Until that date, employers must still comply with the WES list (WorkSafe Victoria, page reviewed 20 October 2026, captured 5 November 2026). From 1 December 2026, worker exposure must not exceed the limits published by Safe Work Australia (SWA, Technical Guide, July 2026, p. 10). The rename is deliberate: the terminology changed to make clear these are limits not to be exceeded (p. 10).
That is the first of two dates. The second is Victoria’s: WorkSafe Victoria publishes a transition for 15 substances that runs to 30 November 2029.
Why Victoria has a second date
Most WEL apply in Victoria from 1 December 2026. Fifteen substances are different: “transition arrangements for 15 substances will apply until 30 November 2029” (WorkSafe Victoria, page reviewed 20 October 2026, captured 5 November 2026). They are bitumen fumes; diesel particulate matter (DPM), measured as respirable elemental carbon; flour dust; grain dust; hydrogen fluoride; manganese fume, dust and compounds; methyl bromide; nickel metal, powder and nickel sulphide roasting; nitric oxide; perchloroethylene; phosphine; Portland cement; styrene monomer; sulphur dioxide; and wood dust (softwood).
Two misreadings worth naming. The framework starts nationally on 1 December 2026, Victoria included; the start does not vary. What varies is when particular substance limits change, and WorkSafe Victoria describes the transition as time to review controls and prepare for the new limits.
What actually changes in the list
The guide lists the categories of change to check for: a decreased or increased limit value, an addition or removal of a type of limit, merging or splitting of groups, and addition or removal of a listing (Technical Guide, July 2026, p. 10). That list maps onto the columns of a register. Some substances keep their number, some get tighter, some gain or lose a short-term limit, some merge so two rows become one, and some disappear because the substance is prohibited under other Australian laws (SWA, Workplace Exposure Limits for Airborne Contaminants, November 2025, p. 3).
This is an inventory reconciliation before it is a monitoring exercise. The guide’s comparison table says as much: existing controls may no longer suffice, and many workplaces will need to retest, review controls and update risk assessments (p. 11, Table 1).
The 2026 changes
Anything on your register whose limit tightens on 1 December 2026 is a 2026 problem. Where a risk assessment indicates a risk of exceeding the limit, controls should be implemented immediately and air monitoring carried out to verify them (p. 26). The first pass is a comparison, substance by substance, of the number you have been managing to against the number that applies from 1 December 2026: comfortable, marginal, or likely over.
The 2029 changes, and why they get missed
The fifteen are the ones a register will leave until later. A date three years out does not compete with this quarter’s audit, and it looks like plenty of time right up until it is not. Because the transitional limit applies until 30 November 2029, with the new limits applying from 1 December 2029, nothing flags it: a 2026 change surfaces through the annual review, a 2029 change only if someone put it in the calendar.
Treat the transition date as a project milestone with lead time, not an item on a list. A substance moving to a tighter limit needs a baseline well before the change, because it tells you whether you need capital works, ventilation, procedural controls or a different product. A limit that holds steady for three years can also suggest the substance is settled, when the current number is not the destination.
The NTGC point, which has no second date
Mixed in with all of this is a category with no number at all, which a register built around thresholds handles badly.
From 1 December 2026, non-threshold genotoxic carcinogens will not have WELs assigned under the national framework, because a safe exposure level cannot be established (WorkSafe Victoria, page reviewed 20 October 2026, captured 5 November 2026). The national WEL list adds that where NTGCs are in Schedules 10 and/or 14 of the model WHS Regulations, additional regulatory requirements apply (SWA, Workplace Exposure Limits for Airborne Contaminants, November 2025, p. 7). The technical guide counts 33 chemicals in the category (Technical Guide, July 2026, p. 11, Table 1).
Until 30 November 2026, PCBUs must continue to ensure the WES, including those for NTGCs, is not exceeded (WEL list, p. 7). After that there is no number to compare against, and the duty does not weaken: employers must eliminate risks associated with NTGCs so far as is reasonably practicable, and if elimination is not reasonably practicable, reduce the risks so far as reasonably practicable using the highest level of control measures available (WorkSafe Victoria, page reviewed 20 October 2026, captured 5 November 2026). The guide frames the same duty through the hierarchy of control (Technical Guide, July 2026, p. 11).
A register with a limit column and a result column cannot express compliance for these substances. What replaces it is a documented control argument: what the substance is used for, whether it can be eliminated or substituted, and if not, why the controls in place are the highest available and what evidence shows they work. Measurement does not disappear. Where a sampling and analysis method exists, air monitoring may still demonstrate exposure is minimised so far as is reasonably practicable (p. 69), a different purpose from compliance monitoring.
Landing both dates in a hazardous substances register
The guide names the hazardous chemicals register and safety data sheets as starting points (p. 26). The register needs four fields it probably lacks: the substance’s status against the transition list, the date its limit moves, the basis for the current control set linked to the supporting assessment, and for NTGCs a control-argument field instead of a limit field, because an empty cell is not an answer.
The monitoring schedule needs the same treatment. Limits are not a target or a safe level; the duty is to keep exposure as low as reasonably practicable, not merely below the limit (p. 58). Action levels are not mandated, but they can be used as a practical trigger for control verification, monitoring frequency and health monitoring decisions (p. 58). For anything on the 2029 list, one set now gives a reason to act well before the transition date.
The review cycle needs a hook too. Reassessment should occur whenever processes, materials or work practices change, or new hazard information becomes available (p. 28). A transition date is that kind of information, and if it is not written into the review trigger it will not survive a change of personnel.
What good looks like from here
The question is not whether anyone can recite the two dates. It is whether the register can answer three questions without opening a PDF: which substances change in 2026, which change in 2029, and which have no number at all.
If it can, the rest is scheduling. If it cannot, the work is a reconciliation against the WEL and Victorian transition lists, done once and written back into the register rather than a memo. The 2026 date is close enough to force it. The 2029 date needs a decision now, while it still looks like there is time.
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