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​​Definition of "Lead-Contaminated Dust" - UPDATED

The California Department of Public Health has updated the definition of “Lead-Contaminated Dust” in the California Code of Regulations (CCR).  The new definition found at Title 17 of the CCR Section 35035 lowers the standard for interior floor surfaces from 40 micrograms (µg) of lead in dust per square foot (ft2) to 10 µg/ft2,  and for interior horizontal surfaces from 250 µg/ft2 to 100 µg/ft2.  The standard for exterior floor and exterior horizontal surfaces remains 400 µg/ft2.  The new standard went into effect on February 2, 2022.  


CDPH adopted the new definition in order to be consistent with standards established by the U.S. Environmental Protection Agency, to reduce the threat of childhood lead poisoning, and to maintain a federally authorized lead-based paint activities program.  Additional details about the change in definition are found on pages 66-70 (1600-1604) of the Notice Register (PDF) issue that initially announced the proposal for a change in November 2021.  

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