California discusses prohibition on high-silica artificial stone
California posted a discussion draft on September 16, 2026 addressing a proposed prohibition involving artificial stone above 1% crystalline silica and related silica amendments. It remains a pre-adoption proposal; September 30, 2026 is a comment date.
The detailed draft text was not verified. This entry establishes the agency's announced scope and discussion status, with no enacted ban or employer compliance deadline.
- Legal status
- Pre-adoption discussion draft; not an enacted ban
- Source check
- Sep 17, 2026
- Topic
- Artificial stone / silica
- Technical review
- Jiaxi · 2026-09-23
What changed
Previous requirement
Current section 5204 remains applicable.
New requirement or current position
Draft proposes prohibition-related provisions for artificial stone above 1% crystalline silica and amendments to silica standards.
Who it affects
- Artificial-stone fabrication
- Construction installation
Dates and milestones
Commencement and compliance dates can differ. Read the conditions beside each date, including any stay or local adoption requirement.
- Announcement or publication
- Sep 16, 2026
- Recorded effective date
- Not established or not applicable
Interested commenters
Comment date, NOT employer compliance deadline.
What this could mean for your IH program
Advisory interpretation: Monitor adoption and final scope before treating a material threshold as a prohibition.
Confirm applicability with a qualified practitioner before changing your program.
Questions and qualifications
- The agency page confirms the discussion draft's existence, status and announced scope. Its detailed prohibition wording has not been verified.
Source evidence
- Emergency silica rulemaking advisory meetings
Cal/OSHA · September 16, 2026 discussion-draft entry
Discussion draft proposes new 5204.1 and changes to 5204/1532.3; targets artificial stone above 1% crystalline silica; comments requested September 30, 2026.
- Standards Board Advances Efforts to Protect Workers from Silicosis
California DIR · May 22, 2026 release
May 21 Board vote granted petition to initiate prohibition process; emergency rulemaking requested. This is not itself an enacted ban.
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