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, PDF (141 kb) Request to proceed with detection response process for metolachlor and S-metolachlor, 2016

  • Attachment 1, PDF (1.3 mb) Study GW09: Ground Water Protection List monitoring for metolachlor and alachlor, 2012
  • Attachment 2, PDF (6.5 kb) Legal agricultural use determination for metolachlor/S-metolachlor degradate detections in California, 2016
  • Attachment 3, PDF (1 mb) Summary of results for FY 2000/2001 Ground Water Protection List monitoring for alachlor, metolachlor, and two degradates of each, 2002

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.

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

Description, PDF (50 kb) of the information that should be in the written report registrants must submit for the public hearing.

Public Hearing: March 28, 2017

Notice of public hearing, PDF (152 kb): A hearing has been requested by the registrants of metolachlor and s-metolachlor to review continued use of their products that contain these active ingredients. The hearing will be at 9:00 a.m., Tuesday, March 28, 2017, in the Sierra Hearing Room at the California Environmental Protection Agency, 1001 I Street, Sacramento. Public testimony will be taken and the meeting will be available through a live Webcast.

  • Public Comments
    • Letter, PDF (375 kb) Dual Herbicide use for California
    • Letter, PDF (244 kb) Support for S-metolachlor herbicide

Public Meeting: May 4, 2017

Notice of public meeting and agenda, PDF (51 kb): A deliberative meeting of the PREC subcommittee will be held at 9:00 a.m., Thursday, May 4, 2017, in the Coastal Hearing Room at the California Environmental Protection Agency, 1001 I Street, Sacramento. Members of the public may attend but no public testimony will be heard. The meeting will be available through a live Webcast.

Subcommittee Findings and Director’s Decision