Risk Characterization Documents (RCDs) estimate the nature and likelihood of adverse health effects in humans who may be exposed to pesticides.
- Toxic Air Contaminant (TAC) Assessment
- August 2018 - Directors Proposed Determination Concerning Chlorpyrifos as a Toxic Air Contaminant (PDF)
- August 2018 - Scientific Review Panel's Findings (PDF)
- July 2018 - Executive Summary (PDF)
- July 2018 - Final Toxic Air Contaminant Evaluation of Chlorpyrifos (Complete Document) (PDF)
- July 2018 - Final Toxic Air Contaminant Evaluation of Chlorpyrifos (Evaluation Only) (PDF)
- Appendix 1 Summary of Toxicology for Chlorpyrifos (PDF)
- Appendix 2 Exposure Estimates and Margins of Exposure for Developmental Neurotoxicity (PDF)
- Appendix 3 Revised Margins of Exposure for Acetylcholinesterase Inhibition (PDF)
- Appendix 4 Andrews and Patterson, 2000 (PDF)
- Appendix 5 Mechanistic Studies of Chlorpyrifos Related Neurodevelopmental Effects (PDF)
- Appendix 6 December 2017 Draft Evaluation of Chlorpyrifos as a Toxic Air Contaminant (PDF)
- June 2018 - Scientific Review Panel Meeting Presentation: Consideration of Addendum to Draft Evaluation of Chlorpyrifos as a Toxic Air Contaminant (PDF)
- June 2018 - Draft Evaluation of Chlorpyrifos as a Toxic Air Contaminant (Addendum to December 2017 Draft Evaluation) (PDF)
- June 2018 - Cover Letter to Scientific Review Panel (PDF)
- December 2017 Scientific Review Panel Meeting Presentation: Overview of Draft Evaluation of Chlorpyrifos as a Toxic Air Contaminant (PDF)
- December 2017 Office of Environmental Health Hazard Assessment Findings on the Health Effects of Chlorpyrifos as a Candidate Toxic Air Contaminant (PDF)
- January 2018 Responses to OEHHA Findings (PDF)
- December 2017 Draft Evaluation of Chlorpyrifos as a Toxic Air Contaminant for the Scientific Review Panel (PDF)
- December 2017 Cover Letter to Scientific Review Panel (PDF)
- December 2017 Charge Questions for the Scientific Review Panel (PDF)
- August 2017 Draft Evaluation of Chlorpyrifos as a Toxic Air Contaminant (PDF)
- December 2017 Responses to Technical Comments by the Public (PDF)
- December 2017 Responses to Comments by Dow AgroSciences LLC (PDF)
- December 2015 Draft Risk Characterization Document (PDF)
- August 2017 Responses to Comments by the California Air Resources Board (PDF)
- August 2017 Responses to Comments by the Office of Environmental Health Hazard Assessment (PDF)
- August 2017 Responses to Comments on Toxicology by Dow AgroSciences LLC (PDF)
- August 2017 Responses to Comments on Exposure by Dow AgroSciences LLC (PDF)
- June 1993 Exposure Assessment Document (PDF)
- May 1992 Dietary Exposure Assessment Document (PDF)
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)