Labor Code section 6383

(a)

For the purposes of this chapter, a hazardous substance is present in any mixture or product if it is present in any of the following concentrations:

(1)

One percent or more of the mixture or product.

(2)

Two percent of the mixture or product if the hazardous substance exists as an impurity in the mixture.

(3)

One-tenth of 1 percent of the mixture or product if the hazardous substance in the mixture or product is designated as a carcinogen pursuant to the Occupational Carcinogens Control Act of 1976 (Ch. 2 (commencing with Section 24200), Div. 20, H.& S.C.) or the federal Hazard Communication Standard (29 C.F.R. Sec. 1910.1200).
The director may, by regulation, raise the concentration requirement for a hazardous substance which the director finds is not hazardous at the threshold levels; and, lower the concentration requirement for a hazardous substance for which there is valid and substantial evidence that the substance is extraordinarily hazardous.

(b)

The manufacturer of a hazardous substance shall notify the director of any valid evidence which indicates that the concentration requirement for a hazardous substance established pursuant to subdivision (a) is higher than what is necessary to protect employees who work with, or may be exposed to, the substance.

Source: Section 6383, https://leginfo.­legislature.­ca.­gov/faces/codes_displaySection.­xhtml?lawCode=LAB§ionNum=6383.­ (updated Jan. 1, 1985; accessed Jun. 25, 2025).

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Verified:
Jun. 25, 2025

§ 6383's source at ca​.gov