Prop 65 Roundup - July 2026

Prop 65 Counsel: What To Know

OEHHA Notices

OEHHA Releases Draft IUR Factor for Acrolein

The Office of Environmental Health Hazard Assessment (OEHHA) released a draft document for public review that summarizes the carcinogenicity data and derives a cancer inhalation unit risk (IUR) factor for acrolein, a toxic air contaminant. IURs are used to estimate lifetime cancer risk from inhalation exposure and serve as important inputs in California’s air toxics risk assessment programs. OEHHA is seeking public comment on the draft value and has extended the comment period through July 29.

OEHHA Releases Draft IUR Factor for Ethylene Oxide

OEHHA released a draft document for public review that summarizes the carcinogenicity data and derives an updated cancer IUR factor for ethylene oxide, a widely used industrial chemical.

OEHHA Advances Proposed NSRLs for Listed Chemicals

OEHHA announced modifications to its proposed rulemaking to establish new No Significant Risk Levels (NSRLs) under Proposition 65 for 1‑bromopropane and diethanolamine (dermal), pursuant to Title 27, California Code of Regulations, section 25705. The proposed NSRLs would establish exposure thresholds below which no cancer warning is required, serving as important “safe harbor” benchmarks for businesses evaluating potential Proposition 65 obligations.