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Widely Used Pesticide to be Considered by DART-IC Expert Panel

Widely Used Pesticide to be Considered by DART-IC Expert Panel

Author: Jack Schatz/Wednesday, August 23, 2017/Categories: CalEPA, OEHHA, State's Qualified Experts, Prop65

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CALEPA has announced that both the California Department of Pesticide Regulations and the Office of Environmental Health Hazard Assessment (OEHHA) are both considering restrictions on chlorpyrifos CAS No. (2921-88-2), a widely used agricultural pesticide that has been used for more than 50 years.

The State’s Department of Pesticide Regulation (DPR) recently published an updated draft risk assessment on the pesticide for public comment. The agency’s release of the document initiates the public and scientific review of the document, which could potentially lead to increased restrictions on the use of chlorpyrifos statewide. The pesticide agency is considering various restrictions on the use of the chemical and recommendations will be made to county agricultural authorities in September.

Meanwhile, the state’s Office of Environmental Health Hazard Assessment (OEHHA) is referring chlorpyrifos for consideration to list the chemical as a developmental toxicant under Proposition 65. OEHHA recently posted a public announcement that the state’s Developmental and Reproductive Toxicant Identification Committee will consider the listing of chlorpyrifos at its next public meeting.

CalEPA Secretary Matthew Rodriquez said in a statement that new scientific information suggests that [chlorpyrifos] may pose more of a health risk than previously thought.

Toxic Air Contaminant?

DPR scientists believe chlorpyrifos may pose a public health risk as a toxic air contaminant based on the agency’s recent assessment of the latest scientific studies about the pesticide. However, the recent findings in the updated draft risk assessment have yet to be peer-reviewed and must go through a public comment period and be independently evaluated by other scientists.

DPR will host a public workshop on the updated draft risk assessment on September,15 at the agency’s Pesticide Registration and Evaluation Committee meeting in Sacramento.

A  45-day written public comment period began on August 18, following the comment period DPR’s updated draft risk assessment will be considered by an independent panel of nine scientists known as the Scientific Review Panel (SRP). The review process, may ultimately lead to more restrictions on use of the chlorpyrifos, may continue through December 2018.

According to the agency, DPR will provide county agricultural commissioners with specific interim recommendations for use of chlorpyrifos in certain situations. These recommendations include”

  • Increasing distances between sites where the chemical is applied and taking precautions for use in locations where children are present. The precautions would be specific to each type of application method.
  • The DPR recommendations may also include new restrictions on methods used to apply chlorpyrifos.

OEHHA Refers Chlorpyrifos to the DART-IC Committee

OEHHA will soon open a written public comment period and provide Hazard Identification Materials that describe the evidence for the developmental toxicity of chlorpyrifos.  The agency will provide the materials and the written public comments to the Developmental and Reproductive Toxicant Identification Committee, an independent panel of 10 scientific experts that will determine whether determine whether the scientific evidence implicating chlorpyrifos clearly shows that the chemical causes birth defects or other reproductive harm. The committee will also consider public comments presented at its November 29 meeting. The DART-IC previously considered chlorpyrifos in 2008, but the panel concluded the chemical did not meet its listing criteria at that time.

The Committee will also consider n-Hexane CAS No. (110-54-3) at its November 29 meeting. This chemical will be

evaluated for listing based on the compounds known effects at male, female and developmental toxicity endpoints.

 n-Hexane is primarily used as a degreaser for metal parts.

DPR’s updated draft risk assessment and other documents relating to chlorpyrifos are available here Information about OEHHA’s November meeting of the Developmental and Reproductive Toxicant Identification Committee is included below.  OEHHA will soon announce the availability of Hazard Identification Materials on its website.

DART-IC Meeting

When:  Wednesday November 29, 2017 from 10: AM to the close of business

Where: CALEPA Headquarters 1001 I Street in Sacramento

Online via Webcast on the day of the event. 


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Jack Schatz

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