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

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Overview

Chlorpyrifos
253
Organophosphate
Insecticide
No
Yes
Proposed
Yes
No
Concluded

 
Risk Assessment Documents

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)
Mitigation Documents

Enforcement Letters

Outreach Activities and Materials

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