Pesticide Contamination Prevention Act Review Process Triggered by Detection of Metolachlor/S-metolachlor Degradates in Ground Water

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Legal Agricultural Use Determination

Detections in ground water of metolachlor ethanesulfonic acid (ESA) and metolachlor oxanilic acid (OXA), degradation products of metolachlor and S-metolachlor, were determined to be from legal agricultural use and DPR responded by placing metolachlor and S-metolachlor in the formal detection response process.

Memorandum – Request to proceed with detection response process for metolachlor and S-metolachlor, 2016

Formal Review Process

A formal review process began in September 2016 following detection of metolachlor and S-metolachlor degradates in ground water.

Notice of detection cover letters listing products containing metolachlor and S-metolachlor, their registrants, procedures for registrants to request a public hearing before a subcommittee of the Pesticide Registration and Evaluation Committee (PREC), and related information.

  • Drexel Chemical Company
  • Makhteshim Agan of North America, Inc. (d/b/a ADAMA Agricultural Solutions Ltd.)
  • Sipcam Agro USA, Inc.
  • Syngenta Crop Protection, Inc.
  • Tenkoz Inc.
  • Winfield Solutions, LLC
    • Attachment 1, PDF – Notice of metolachlor/S-metolachlor degradation product residue detections in California ground water and registrant opportunity to request a hearing, 2016
    • Attachment 2, PDF – Legal agricultural use determination for metolachlor/S-metolachlor degradate detections in California, 2016

Registrant letters to request a public hearing before a subcommittee of the PREC:

Description of the information that should be in the written report registrants must submit for the public hearing.

Public Hearing: March 28, 2017


Public Meeting: May 4, 2017


Subcommittee Findings and Director's Decision