On March 27, 2015, the Office of Environmental Health Hazard Assessment (OEHHA) provided notice that atrazine, propazine, simazine, des-ethyl atrazine (DEA), des-isopropyl atrazine (DIA) and 2,4-diamino-6-chloro-s-triazine (DACT)[1] would be added to the list of chemicals known to the state to cause reproductive toxicity for purposes of Proposition 65[2] with a delayed effective date due to pending litigation.

The listing of these chemicals was initially to be effective on August 3, 2015. Due to Syngenta Crop Protection’s[3] legal challenge to the listing, this was later changed several times because of delays in the litigation. Syngenta’s challenge was unsuccessful in the trial court. Although the case has been appealed, no stay of the listing has been granted. Therefore, atrazine, propazine, simazine, des-ethyl atrazine (DEA), des-isopropyl atrazine (DIA) and 2,4-diamino-6-chloro-s-triazine (DACT) are being added to the Proposition 65 list on July 15, 2016.

In summary, these six chemicals are listed under Proposition 65 effective July 15, 2016 as known to the state to cause reproductive toxicity, as follows:

-Atrazine

-Propazine

-Simazine

-Des-ethyl atrazine (DEA)

-Des-isopropyl atrazine (DIA)

-2,4-Diamino-6-chloro-s-triazine (DACT)

http://oehha.ca.gov/proposition-65/crnr/atrazine-propazine-simazine-and-their-chlorometabolites-dact-dea-and-dia-0