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On this Page
  • Recent Reports and Announcements
  • Risk Evaluation and Mitigation Documents
  • Historic Documents

Information on Chlorothalonil

See all Active Ingredients

Find information on the registration status, continuous evaluation and mitigation measures in California to regulate this active ingredient. An active ingredient is the chemical that makes a pesticide work on a target pest.

Active Ingredient: Chlorothalonil
Type of Pesticide: Fungicide
California Registration: Yes
Products Registered
EPA Registration: Yes
Fumigant: No
California Restricted Material: No
Toxic Air Contaminant (TAC): No
Volatile Organic Compound (VOC): No
Potential Groundwater Contaminant: Yes
Reevaluation Status: None
Chemical Class: Organochlorine
DPR Chemical Code: 677

Recent Reports and Announcements

  • Potential for Chlorothalonil Movement to California Groundwater as a Result of Agricultural Use
  • Results for Study GW10A: Ground Water Protection List Monitoring for Azoxystrobin, Chlorothalonil, Dichloran, and Iprodione
  • Summary of Japanese Beetle Eradication Program Monitoring for Chlorantraniliprole in Sacramento Country, 2021-2023

Risk Evaluation and Mitigation Documents

  • April 2018 - Cancer Potency Estimate for Chlorothalonil - English pdf  
  • January 2005 - Chlorothalonil Risk Characterization Document (Dietary Exposure) - English pdf  

Historic Documents

  • March 2013 – Lompoc Monitoring Report
  • January 2004 – Final Report for the 2002 Application Air Monitoring for Chlorothalonil and Methamidophos in San Joaquin County (Appendices)
  • November 2003 – Final Report for the 2002 Ambient Air Monitoring for Chlorothalonil in Fresno County (Appendices) (Corrections)
  • January 2002 – Use Information and Air Monitoring Recommendations for the Pesticide Active Ingredients Acephate, Chorothalonil, and Methamidaphos
  • August 1999 – Chlorothalonil - Risk Assessment Rebuttal: Zeneca Response to CalEPA DPR Draft Chlorothalnil Risk Characterization Document (December 10, 1998)
  • October 1998 – Inhalation Exposure of Chlorothalonil
  • February 1998 – Contact Dermatitis in California Nursery Workers: Part I. Surveillance of Skin Disease
  • August 1996 – Compilation of Clothing Penetration Values: Harvesters
  • April 1996 – Greenhouse Pesticide Mixer/Loader/Applicator Exposure Study
  • July 1995 – Study to Evaluate the Urinary Metabolites of Chlorothalonil Following Dermal Application to Male Rhesus Monkeys, Development of Method for Monitoring Exposure of Workers to ASC 2787 (Chlorothalonil)
  • April 1991 – Dermal Exposure of Mixer/loaders, Applicators and Harvesters to Captan, Chlorothalonil and Folpet (Poster Presentation at 9th Annual Meeting, Society of Toxicology & Chemistry, 1988)
  • September 1989 – Field Worker Exposure to Chlorothalonil While Picking Bush Grown Tomatoes in Stanislaus County California
  • June 1989 – Worker Exposure to Chlorothalonil Residues During the Harvest of Fresh Market Pole Tomatoes
  • April 1989 – Dislodgeable Foliar Residues of Chlorothalonil (Bravo) on Row Crops in California During 1987
  • September 1988 – Chlorothalonil Exposure to Workers on Mechanical Tomato Harvesters
  • February 1988 – A General Survey of Foliar Pesticide Residues and Air Concentration Levels Following Various Greenhouse Applications, 1986
  • November 1987 – A Study to Establish Degradation Profiles for Six Pesticides (Triforine, Endosulfan, Chlorothalonil, Sulfotep, Dodemorph Acetate, and Daminozide) Used on Ornamental Foliage in San Diego County California During Fall 1986
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