Active Ingredient: Chlorpyrifos
Human Health Risk Assessment and Mitigation
Documents and Activities

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Overview


Risk Characterization Documents (RCDs) estimate the nature and likelihood of adverse health effects in humans who may be exposed to pesticides.

Other Documents

  • August 2017 – Revised: Estimation of Chlorpyrifos Horizontal Deposition and Air Concentrations for California Use Scenarios (PDF)
  • August 2017 – Report for Pesticide Application Air Monitoring for Chlorpyrifos and Chlorpyrifos-Oxon in San Joaquin County in July 2015
  • August 2017 - Cases Reported to the Pesticide Illness Surveillance Program and Evaluated as Associated with Exposure to Chlorpyrifos, Alone or in Combination with Other Products, 2004-2014 (PDF)
  • December 2016 – Report for Pesticide Application Site Monitoring for Chlorpyrifos and Chlorpyrifos-Oxon in Imperial County in October 2014
  • December 2015 – Estimation of Chlorpyrifos Horizontal Deposition and Air Concentrations for California Use Scenarios (PDF)
  • March 2013 – Lompoc Monitoring Report
  • August 2011 – Comments On U.S. EPA's Preliminary Risk Assessment For Chlorpyrifos: With A Focus On Exposure Assessment (PDF)
  • May 2010 – Comparison of Initial Deposition and Residue Dissipation of Chlorpyrifos Using Conventional Flat Fan Nozzles vs. Hypro® TwinCap™ Nozzles Fitted with Ultra-Lo Drift Spray Tips (PDF)
  • September 2007 – Results from Sample Collection in Tulare County for A Suspected Organophosphate Exposure Event (PDF)
  • September 2007 – Project 0706 - Worker Health and Safety's Involvement In: Chlorpyrifos Drift Investigation In Fresno County (PDF)
  • September 2007 – Project 0704 - WHS Involvement In Priority Investigation 41-Tul-07: Chlorpyrifos Drift Investigation, Tulare County (PDF)
  • September 2007 – Project 0703 - Tulare County Chlorpyrifos Restricted Entry Interval Violation in Oranges (PDF)
  • February 2005 – Chlorpyrifos Field Spike Degradation Study, Project #0403 (PDF)
  • April 2004 – Forensic Review and Sampling of PPE/Respiratory Protective Equipment Associated with Priority Investigation 3-RIV-04 (PDF)
  • March 2004 – Forensic Review and Sampling of PPE/Respiratory Protective Equipment Associated with Priority Investigation 3-RIV-04 (PDF)
  • October 2002 – Response to Comments from Dow AgroSciences LLC on the Draft Chlorpyrifos Risk Characterization Document by the California Department of Pesticide Regulation (Exposure Assessment Section) (PDF)
  • October 2001 – WH&S Branch Activities and Results of Analyses Related to the Investigation of Priority Illness Episode 45-TUL-00 (Project 0002) (PDF)
  • October 2001 – WH&S Branch Activities and Results of Analyses Related to the Investigation of 22-TUL-00 (Project 0001) (PDF)
  • WH&S Branch Activities and Results of Analyses Related to the Investigation of 43-FRE-99 (Project 9903) (PDF)
  • July 1999 – Chlorpyrifos Odor Provoking the Onset of Clinical Symptoms (PDF)
  • January 1999 – Oral and Dermal Absorption of Chlorpyrifos: A Human Volunteer Study (PDF)
  • April 1998 – Report for the Application and Ambient Air monitoring of Chlorpyrifos in Tulare County During Spring/Summer, 1996
    • Appendices
  • February 1998 – Contact Dermatitis in California Nursery Workers: Part II. Pilot Field Study (PDF)
  • February 1993 – Aerial Movement and Deposition of Diazinon, Chlorpyrifos, and Ethyl Parathion (PDF)
    • Executive Summary
  • December 1991 – 1989 Probe Study to Determine the Exposure of Aerial Application Flaggers to Organophosphate Pesticides Via Urinary Metabolite Monitoring (PDF)
  • August 1991 – Determination of Dermal Absorption of Chlorpyrifos in Humans (PDF)
  • April 1991 – Structural Chemical Exposure Studies Provide Human Metabolism and Urine Clearance Data for Chlorpyrifos, Dimethoate and Malathion (PDF)
  • March 1991 – Situational Chemical Exposure Studies Provide Human Metabolism and Urine Clearance Data for Chlorpyrifos, Dimethoate, and Malathion (PDF)
  • March 1991 – Measuring Potential Dermal Transfer of Surface Pesticide Residue Generated from Indoor Fogger Use: Using the CDFA Roller Method, Interim Report II (PDF)
  • May 1990 – Measuring Potential Dermal Transfer of Surface Pesticide Residue Generated from Indoor Fogger Use: An Interim Report (Chemosphere 20, (3/4), 349-360, 1990) (PDF)
  • January 1990 – Human Illnesses/Injuries Reported by Physicians in California Involving Indoor Exposure to Pesticides Containing Chlorpyrifos, DDVP and/or Propoxur 1983-1986 (PDF)
  • July 1986 – Dissipation of Dislodgeable Foliar Residue for Chlorpyrifos and Dichlorvos Treated Lawn: Implication for Safe Reentry (Bull Environ Contam & Toxicol 37, 33-40, 1986) (PDF)
  • December 1985 – Monterey County Residential Air Monitoring
  • November 1984 – Dissipation of Dislodgeable Residue of Chlorpyrifos and DDVP on Turf (PDF)
  • July 1984 – Degradation of Dislodgeable Residues of Chlorpyrifos and Diazinon on Turf - A Preliminary Survey (PDF)

Enforcement Letters

  • September 2017 - Pesticide Registration and Evaluation Committee Agenda (PDF)
    • California's Toxic Air Contaminant Program for Pesticides (PDF)
    • Draft Evaluation of Chlorpyrifos as a Toxic Air Contaminant (PDF)
    • Directive for Interim Mitigation Measures to Address Health Risks from Chlorpyrifos (PDF)
  • March 2015 - Agricultural Pest Control Advisory Committee Meeting Agenda (PDF)
    • Chlorpyrifos Update
    • Agricultural Pest Control Advisory Committee Meeting Minutes (PDF)
  • November 2014 - Pest Management Advisory Committee Meeting Agenda (PDF)
    • Proposed Regulation to Designate Chlorpyrifos a Restricted Material (PDF)
  • October 2014 - Critical Uses of Chlorpyrifos
  • September 2014 - Agricultural Pest Control Advisory Committee Meeting Agenda (PDF)
    • Chlorpyrifos Update (PDF)
  • August 2014 - Pesticide Registration and Evaluation Committee Agenda (PDF)
    • Chlorpyrifos Update (PDF)
    • Pesticide Registration and Evaluation Committee Meeting Minutes (PDF)
  • January 2009 - Pesticide Registration and Evaluation Committee Agenda (PDF)
    • Status of Chlorpyrifos and Diazinon Reevaluations (PDF)
    • Pesticide Registration and Evaluation Committee Meeting Minutes (PDF)
  • May 2007 - Pest Management Advisory Committee Meeting Agenda (PDF)

For content questions, contact:

Ann Schaffner
Worker Health and Safety Branch
1001 I Street, P.O. Box 4015
Sacramento, CA 95812-4015
Phone: (916) 445-4222
E-mail: Ann.Schaffner@cdpr.ca.gov

Kara James
Pesticide Registration Branch
1001 I Street, P.O. Box 4015
Sacramento, CA 95812-4015
Phone: (916) 324-3523
E-mail: Kara.James@cdpr.ca.gov