If a contractor hands me an exposure assessment for lead built on out-of-state numbers, I stop reading and start over. California’s construction lead standard was amended effective 1 January 2025, and the state’s limits are now five times stricter than the federal ones.
The current limits
Under 8 CCR section 1532.1 the permissible exposure limit is 10 micrograms per cubic metre as an eight-hour time-weighted average, with an action level of 2 micrograms per cubic metre. There is a narrow exception for abrasive blasting, which sits at 25 micrograms per cubic metre until 1 January 2030.
Federal OSHA’s PEL remains 50 micrograms per cubic metre. That gap is the whole problem with borrowed data: a survey that cleared a task under the federal number says nothing useful about whether the same task clears in California, and a negative exposure determination written on that basis will not survive review.
Trigger tasks and what happens before you have results
Section 1532.1(d)(2) sets out presumed exposure levels for named tasks until the employer’s own assessment is complete:
- Level 1 — above the PEL but not more than ten times the PEL
- Level 2 — more than ten times but not more than fifty times the PEL
- Level 3 — more than fifty times the PEL
Each level carries interim respiratory protection, protective clothing and medical surveillance obligations that apply from the first day of the task and stay in place until the employer’s own monitoring says otherwise. In other words, the assessment is not a precondition to the controls. It is what allows them to be reduced.
Where this bites
Bridge and highway work, tank and steel structure repainting, demolition and renovation of older buildings, torch cutting and welding on coated steel, and anything involving abrasive removal of paint. On public works, a written lead compliance plan is normally expected before the first disturbance of coated surfaces, and after the 2025 amendment it makes sense to write that plan presumptively — assume the task is a trigger task, staff it accordingly, and monitor to step down — rather than to build it on a negative determination borrowed from another jurisdiction.
Blood lead monitoring belongs in the same conversation. The airborne number describes the environment; the biological result describes the person, including exposure the employer never measured, from a hobby, a home renovation, or a previous employer.
Michael Karl McNeil — industrial hygiene, environmental health and safety, California and the Western states.
Michael Karl McNeil 