California Health & Safety Code §§ 26200--26204
Required the California Research Bureau, in consultation with the Department of Public Health and with the assistance of a review panel, to perform a study and to publish findings on fungal contamination affecting indoor environments. Required the study to include information on health effects, assessment, remediation, and hazard communication, among other issues. Required the California Research Bureau to submit its findings to the legislature and the Director of Public Health.
California Health & Safety Code §§ 26100--26157
Requires the state health agency to consider the feasibility of adopting permissible exposure limits to mold in indoor environments and, if feasible, to adopt such limits. Establishes criteria to consider in adopting standards, and provides that the department may also adopt alternative standards for facilities that serve people at greater risk. Provides that the law shall be implemented only to the extent that the department determines that funds are available for its implementation. Authorizes local enforcement of any standards adopted by the department.
California Health & Safety Code § 105425
Requires the state health agency to conduct and promote the coordination of research, investigations, experiments, demonstrations, surveys, and studies relating to the causes, effects, extent, prevention, and control of indoor pollution.
California Health & Safety Code § 105405

Required the state health agency, through its Indoor Air Quality Program, to develop non-binding guidelines for the reduction of exposure to volatile organic compounds from construction materials in newly constructed or remodeled office buildings. (Guidelines available at: https://www.cdph.ca.gov/Programs/CCDPHP/DEODC/EHLB/AQS/Pages/VOCs.aspx.)

California Health & Safety Code § 105430
Provides that the state health agency may develop radon assessment and mitigation requirements for new construction in at-risk areas.
California Business & Professions Code §§ 10084.1--.2
Requires the state to prepare a booklet to educate consumers about common environmental hazards affecting real property, including radon. Law amended in 2023 to require updating the materials, as resources permit, to include new sections on wildfires, climate change, and sea level rise.
California Health & Safety Code §§ 106750 et seq.
Establishes that no person may provide radon services for the general public unless that person has completed the National Radon Measurement Proficiency Program of the National Environmental Health Association or the National Radon Safety Board Certified Radon Professional Program. Requires certification of completion of either course to the state health agency, and requires the agency to make available to the public a list of individuals so certified.
California Civil Code §§ 1102--1102.18
Requires sellers of real property containing up to four residential units to complete a disclosure form indicating the presence of all environmental hazards, including radon gas, formaldehyde, and mold, that are known to the seller. Also requires disclosure of whether property contains a carbon monoxide device. Requires resale of manufactured homes and mobile homes to include disclosure of environmental hazards in the home interior or exterior, including radon, formaldehyde, and lead-based paint, as well as the existence of a carbon monoxide device.
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