Effective from 7 July 2017, the Office of Environmental Health Hazard Assessment (OEHHA) will add1 glyphosate (CAS No. 1071-83-6), an active substance in plant protection products, to the chemical list2as known to the state to cause cancer under the Safe Drinking Water and Toxic Enforcement Act of 1986 (Proposition 653). The warning requirement will take effect one year later.
The OEHHA initially issued a notice of intent to list4 glyphosate in September 2015. Due to a company’s challenge to the scientific evidence of risk evaluation for glyphosate, the effective date of this listing was delayed and determined to 7 July 2017 finally.
Beginning of 7 July 2018, businesses with 10 or more employees are required to provide a clear and reasonable warning5 before knowingly and intentionally exposing anyone to the glyphosate unless the exposure is low enough to pose no significant risk of cancer (i.e. safe harbor level). The OEHHA has proposed a safe harbor level6 with 1100 micrograms per day for glyphosate to aid businesses in determining whether a warning is required or not.