Active Ingredient: Methyl Parathion
Human Health Risk Assessment and Mitigation
Documents and Activities

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

• October 2010 – Addendum including Occupational, Ambient Air, and Aggregate Exposures (PDF)
  • October 2010 – Exposure Assessment Document (PDF)
• February 2007 – Errata for the October 2004 Dietary and Ambient Air Exposures RCD (PDF)
• October 2004 – Risk Characterization Document (PDF)
• Toxic Air Contaminant (TAC) Assessment
  • November 1999 – Director's Proposed Decision (PDF)
  • February 2000 – Office of Environmental Health Hazard Assessment's Findings (PDF)
  • October 1999 – Executive Summary (PDF)
  • October 1999 – Part A: Environmental Fate (PDF)
  • October 1999 – Part B: Exposure Assessment (PDF)
  • October 1999 – Part C: Human Health Assessment (PDF)
  • September 1999 – Scientific Review Panel's Findings (PDF)

Other Documents

• December 2003 – A Study to Determine the Urinary Elimination of Para-Nitrophenol and Its Conjugates Following Dermal Exposure of Rats to Methyl Parathion (PDF)
• December 2003 – Determination of Dermal Absorption of Methyl Parathion (PDF)
• September 2003 – Preliminary Methyl Parathion Air Concentrations Measured Adjacent to Two Walnut Orchard Applications
• August 1989 – Methyl Parathion Application Air Monitoring in Sutter County, May 1989
• May 1987 – Methyl Parathion Ambient Air Monitoring in Colusa and Sutter Counties
  • Corrections
• April 1987 – Measurement and Computer Model Simulation of the Volatilization Flux of Molinate and Methyl Parathion From a Flooded Rice Field
• December 1985 – Monterey County Residential Air Monitoring
• September 1981 – Exposure of Greenhouse Workers to Encapsulated Methyl Parathion (Penncap-M) Being Used on Chrysanthymums in Santa Clara and San Mateo Counties in 1981 (PDF)
• May 1976 – Occupational Exposure Incidents in California in 1975 Involving Methyl Parathion (PDF)
• July 1974 – Worker Safety Study on Methyl Parathion on Grapes (PDF)

• December 2014 – Completion of Mitigation (PDF)
• April 2012 – Mitigation (PDF)

Enforcement Letters

• February 2009 – ENF 2009-05 – Updates To Volume 3, Restricted Materials And Permitting, Pesticide Use Enforcement Program Standards Compendium
• April 2008 – ENF 2008-011 – 2008 Rice Pesticides Program
• April 2007 – ENF 2007-015 – 2007 Rice Pesticides Program
• March 2006 – ENF 2006-008 – Rice Pesticides Program 2006
• March 2005 – ENF 2005-015 – Rice Pesticides Program 2005
• April 2004 – ENF 2004-006 – Rice Pesticides Program 2004
• March 2003 – ENF 2003-011 – Rice Pesticides Program 2003
• April 2002 – ENF 2002-012 – Rice Pesticides Program for 2002
• April 2001 – ENF 2001-017 – Rice Pesticides Program for 2001

• Pesticide Product Database
• Human Health Assessment Branch Memos
• Human Health Assessment Branch Publications, Posters/Abstracts and Presentations
• Worker Health and Safety Reports and Memos
• Environmental Monitoring Branch Publications
  • Environmental Fate Reviews
• Air Monitoring Network
• Pesticide Use Reporting (PUR)
• California Pesticide Illness Query (CalPIQ)
• Environmental Justice (EJ)
• OEHHA Proposition 65 Information
• U.S. EPA Pesticide Chemical Search
• PubChem-Chemical Information