CA Prop 65 compliance

1. Identify applicable chemicals: Review your product formulations, ingredients, and materials against the current OEHHA Prop 65 chemical list (available at oehha.ca.gov). Focus on chemicals commonly found in your product category — for example, lead and phthalates in electronics, acrylamide in food, or BPA in plastics.

1. Engage an accredited testing laboratory: Select a laboratory accredited by a recognized body (such as A2LA or ILAC) with experience in Prop 65 testing for your product type. Submit representative product samples for chemical analysis using validated methods.

1. Compare results to safe harbor levels: Review laboratory results against OEHHA's published NSRLs (for carcinogens) and MADLs (for reproductive toxins). Your legal counsel or compliance consultant can help interpret results and calculate daily exposure levels based on realistic use scenarios.

1. Determine warning obligation: If any listed chemical is present above safe harbor thresholds, you are legally required to provide a Prop 65 warning. If all chemicals are below thresholds, document this finding thoroughly as your compliance defense.

1. Implement compliant warnings: If warnings are required, draft language that meets the 2018 "clear and reasonable" warning regulations — including the specific chemical name, the type of harm (cancer, birth defects/reproductive harm), and the required "WARNING:" header. Apply warnings to product labels, packaging, retail shelf tags, or online product pages as appropriate.

1. Maintain compliance documentation: Retain all testing reports, safe harbor calculations, warning implementation records, and any reformulation documentation. This paper trail is your primary defense in the event of a citizen suit or regulatory inquiry.

1. Monitor regulatory updates: Subscribe to OEHHA's email updates and review the chemical list at least annually. When new chemicals are added or safe harbor levels are revised, reassess affected products and update warnings or reformulations as needed.

Proposition 65 compliance assessment centers on two core determinations: whether a product exposes consumers to any of the 900+ listed chemicals at levels above established safe harbor thresholds, and whether appropriate warnings are provided when such exposures occur.

Chemical testing is the primary technical component. Products are tested by accredited third-party laboratories using validated analytical methods (such as ICP-MS for heavy metals, GC-MS for organic compounds, and HPLC for other substances) to quantify concentrations of listed chemicals. Results are compared against OEHHA's No Significant Risk Levels (NSRLs) for carcinogens and Maximum Allowable Dose Levels (MADLs) for reproductive toxins. Common chemicals assessed include lead, cadmium, DEHP and other phthalates, bisphenol A (BPA), acrylamide (in food), arsenic, mercury, and formaldehyde, among many others.

Warning adequacy is the second major assessment dimension. If chemicals are present above safe harbor levels, businesses must evaluate whether their warnings meet the "clear and reasonable" standard established by the 2018 regulations. This includes reviewing warning language (which must now name the specific chemical and type of harm), placement (on product labels, at points of sale, or online for internet sales), and transmission (ensuring the warning reaches the consumer before exposure). Documentation practices are also assessed — businesses must maintain records of testing results, safe harbor calculations, warning implementation, and any reformulation decisions to defend against enforcement actions.

Proposition 65 is one of the most consequential product safety regulations in the United States, effectively functioning as a de facto national standard because the scale of the California market — the world's fifth-largest economy — makes it impractical for most manufacturers and retailers to maintain separate product lines. Any company selling physical products in California, whether through brick-and-mortar retail, e-commerce, or direct distribution, must assess Prop 65 applicability. Enforcement is driven largely by private plaintiff law firms and advocacy organizations, which filed thousands of notices of violation annually throughout the 2010s and 2020s, generating hundreds of millions of dollars in settlements each year.

The compliance industry around Prop 65 is substantial, encompassing accredited testing laboratories, specialized legal counsel, regulatory consultants, and compliance software providers. Demand for Prop 65 compliance services has grown steadily as the chemical list expands and enforcement activity remains high. The 2018 warning label reforms initially created a surge in compliance activity as businesses updated labeling across product lines. Industries most heavily affected include food and dietary supplements, electronics, building materials, furniture, jewelry, and personal care products.

Compared to EU REACH or RoHS, Prop 65 is unique in that it is a disclosure and warning law rather than a ban or restriction — products with listed chemicals can still be sold, provided proper warnings are given. This nuance means compliance is achievable for most businesses but requires ongoing vigilance. The regulation's broad scope and active private enforcement make it one of the most litigated environmental statutes in California, and non-compliance remains a significant financial risk for companies of all sizes.

California's Proposition 65, formally known as the Safe Drinking Water and Toxic Enforcement Act, was passed by California voters as a ballot initiative in November 1986 with nearly 63% of the vote. It was a direct response to growing public concern about the contamination of drinking water sources and exposure to toxic chemicals in consumer products. The law required the state to publish and maintain a list of chemicals known to cause cancer, birth defects, or other reproductive harm, and mandated that businesses warn Californians before knowingly exposing them to such chemicals.

The Office of Environmental Health Hazard Assessment (OEHHA) was designated as the lead agency responsible for administering Prop 65, including maintaining the chemical list and establishing safe harbor levels. Since its inception, the list has grown from a few dozen chemicals to over 900 substances. Major regulatory milestones include the 2016 amendments (effective August 2018) that significantly overhauled warning label requirements, mandating more specific "clear and reasonable" warnings that identify the chemical of concern and the nature of the hazard. The law has been a model for chemical disclosure policy and has influenced similar regulations in other jurisdictions, though it remains unique to California in its enforcement mechanism, which allows private citizens and advocacy groups to file lawsuits against non-compliant businesses.