PAN Pesticides Database - Chemicals

Chlormequat chloride - Identification, toxicity, use, water pollution potential, ecological toxicity and regulatory information

Note: See Working with the Information on this Page section below for important notes about this data.

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Identifying information, including synonyms, ID numbers, use type, chemical classification, a link to a list of all products containing this chemical and a list of the top crops this pesticide is used on in California.
Signs and symptoms of poisoning, first aid, and links to treatment information for this chemical.
Link to information on toxicity to humans, including carcinogenicity, reproductive and developmental toxicity, neurotoxicity, and acute toxicity.
Links to world-wide registration status as well as regulatory information for the U.S. and California.
Water quality standards and physical properties affecting water contamination potential.
Toxicity to aquatic organisms.
List of chemicals in the same family, including breakdown products, salts, esters, isomers, and other derivatives.

Chemical Identification and Use for Chlormequat chloride

Basic Identification Information About This Chemical
Chemical Name: Chlormequat chloride
CAS Number: 999-81-5
U.S. EPA PC Code: 018101
CA DPR Chem Code: 1512
Molecular Weight: 158.07
Molecular Structure:
Use Type: Plant Growth Regulator
Chem Class: Quaternary Ammonium Compound
View Related Chemicals
Additional Resources About This Chemical Class and Use Type
Historical Use of this Chemical
Top five crops and sites for this pesticide in California
Greenhouse Plants   Outdoor Container Nursery   Greenhouse Propagation   Outdoor Propagation Nursery   Greenhouse Flowers  
View All Crops and Sites
Other Names for this Chemical
About Chemical Synonyms
(US EPA PC Code ) , 018101 (US EPA PC Code Text ) , 1512 (CA DPR Chem Code) ) , 2-Chloro-N,N,N-trimethylethanaminium chloride , 2-Chloro-N,N,N-trimethylethanaminium chloride (1:1) , 2-Chloroethyl trimethyl ammonium chloride , 60-CS-16 , 999-81-5 (CAS number) , 999815 , 999815 (CAS number without hyphens) , Ammonium, (2-chloroethyl)trimethyl-, chloride , Antwylegacz , BAS 062W , CCC Plant Growth Regulator , CeCeCe , Chlormequat (Chlorid) , Chlormequat (chloride) , Chlormequat chloride , CHLORMEQUAT CHLORIDE (CA DPR Chem Code Text ) , Chlormequat chloride (CCC) , chlormequat chlorure , Chlormequat-chlorid , Chlormequat-chloride , Chlormequatchloride , Chlormequate Chloride , Chlorocholine chloride , Chloromequat Chloride , chlorure de chlorocholine , Choline dichloride , Cloreto De Clormequate , CloretoDeClormequate , clormequato (cloreto) , Cycocel , Cycogan , Cycogan Extra , EI 38,555 , Ethanaminium, 2-chloro-N,N,N-trimethyl-, chloride , Hico CCC , Increcel , klormekvatklorid , Kl?rmequat (kl?rmekv?t, Ccc) , Lihocin , N-(2-Chloroethyl)-N,N,N-trimethylammonium chloride , NCI-C02960 , Retacel , Retacil , Stabilan , Trimethyl-.beta.-chlorethylammonium chloride , WR 62
Products Containing This Chemical
Current and historic U.S. registered products
View U.S. Products All Products Currently Registered Products

Signs and Symptoms of Chlormequat chloride Poisoning

NOTE! There may be other diseases and chemicals that have similar symptoms.

If you have a poisoning emergency in the United States call 1-800-222-1222.
If the victim has collapsed or is unconscious, call 911.

Symptoms of Chlormequat chloride Exposure from the International Chemical Safety Cards (ICSC)

Report a Poisoning

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Route of Exposure


First Aid

Inhalation (See Ingestion). Fresh air rest.
Skin MAY BE ABSORBED! Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention.
Eyes Redness. First rinse with plenty of water for several minutes (remove contact lenses if easily possible) then take to a doctor.
Ingestion Excessive salivation. Sweating. Visual disturbance. Diarrhoea. Dizziness. Headache. Laboured breathing. Nausea. Rinse mouth. Refer for medical attention.
Notes for ICSC Information
Use of atropine as specific treatment is contraindicated. If the substance is formulated with solvent(s) also consult the card(s) (ICSC) of the solvent(s). Carrier solvents used in commercial formulations may change physical and toxicological properties.

Toxicity Information for Chlormequat chloride

  Note: Information for many chemicals is incomplete and may not be fully representative of effects on humans. Why?

Summary Toxicity Information

PAN Bad Actor
Carcinogen Cholinesterase
Water Contaminant
Developmental or
Reproductive Toxin
Not Likely No
Indicates high toxicity in the given toxicological category. Indicates no available weight-of-the-evidence summary assessment. For additional information on toxicity from scientific journals or registration documents, see the "Additional Resources for Toxicity " section of the chemical detail page.
1. PAN Bad Actors are chemicals that are one or more of the following: highly acutely toxic, cholinesterase inhibitor, known/probable carcinogen, known groundwater pollutant or known reproductive or developmental toxicant. NOTE! Because there are no authoritative lists of Endocrine Disrupting (ED) chemicals, EDs are not yet considered PAN Bad Actor chemicals.
2. The acute toxicity reported on this page is of the pure chemical ingredient only and may not reflect the acute toxicity of individual pesticide products. To view acute toxicity of individual products, click on 'View Products' link in the 'Chemical Identification' section above.

Detailed Toxicity Information

Acute Toxicity 2
Chlormequat chloride
WHO Acute Hazard
TRI Acute Hazard
Material Safety Data Sheets
Acute rating from U.S. EPA product label
U.S. NTP Acute Toxicity Studies
      View Studies
Cholinesterase Inhibitor
III, Slightly Hazardous
Not Listed
Not Available
Slightly Toxic
Slightly to Highly Toxic

2. The acute toxicity reported on this page is of the pure chemical ingredient only and may not reflect the acute toxicity of individual pesticide products. To view acute toxicity of individual products, click on 'View Products' link in the 'Chemical Identification' section above.
Cancer Information
Chlormequat chloride
IARC Carcinogens
U.S. NTP Carcinogens
California Prop 65 Known Carcinogens
U.S. EPA Carcinogens
TRI Carcinogen
Not Listed
Not Listed
Not Listed
Not Likely
Not Listed
Endocrine Disruption
Chlormequat chloride
Illinois EPA list
Keith list
Colborn list
Benbrook list
Danish Inert list
EU list
Not Listed
Not Listed
Not Listed
Not Listed
Not Listed
Not Listed
Reproductive and Developmental Toxicity
Chlormequat chloride
CA Prop 65 Developmental Toxin
U.S. TRI Developmental Toxin
CA Prop 65 Female Reproductive Toxin
CA Prop 65 Male Reproductive Toxin
U.S. TRI Reproductive Toxin
Not Listed
Not Listed
Not Listed
Not Listed
Not Listed
Chemicals of Special Concern
Chlormequat chloride
PAN Bad Actors
PAN Dirty Dozen list
Not Listed

Water Pollution Potential and Criteria for Chlormequat chloride

Water Pollution Potential

PAN Ground Water Contaminant Rating Insufficient Data
Physical Property Data Related to Water Contamination Potential
Water Solubility (Avg, mg/L)
Adsorption Coefficient (Koc)
Hydrolysis Half-life (Avg, Days)
Aerobic Soil Half-life (Avg, Days)
Anaerobic Soil Half-life (Avg, Days)

Sorry, no water quality standards or criteria have been established for this chemical by the U.S. or Canadian governments; however, there may be criteria established for related chemicals.


Regulatory Information for Chlormequat chloride

International Regulatory Status

UNEP Persistent Organic Pollutant (POP)
UNEP Prior Informed Consent Chemical (PIC)
WHO Obsolete Pesticide
Not Listed
Not Listed
Not Listed

U.S. and California Regulatory Status

U.S. EPA Registered
U.S. EPA Hazardous Air Pollutant
U.S. EPA Minimum Risk Pesticide (25b list)

CA Registered
CA Groundwater Contaminant
CA Toxic Air Contaminant
Not Listed

Not Listed
Not Listed

Maximum Tolerance and Residue Levels

Codex Alimentarius
   (UN FAO Maximum Residue Limits)
U.S. Maximum Tolerance Levels
European Union Maximum Residue Levels
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Ecotoxicity for Chlormequat chloride

Note! Information for many chemicals is incomplete and may not be fully representative of effects on the environment. Why? Click on underlined terms for definitions and additional information.

Aquatic Ecotoxicity

All Toxic Effects for Organism Group
Organism Group Effects Noted
Crustaceans Mortality
Fish Mortality
Molluscs Intoxication
Phytoplankton Biochemistry, Population
Zooplankton Intoxication, Mortality
View All Aquatic Ecotoxicity Studies and References
Summary of Acute Toxicity for Organism Group
Organism Group Average Acute Toxicity Acute Toxicity Range
Crustaceans Not Acutely Toxic Not Acutely Toxic
Fish Not Acutely Toxic Not Acutely Toxic
Zooplankton Slightly Toxic Slight Toxicity
View All Acute Summaries

Terrestrial Ecotoxicity

Summary of Acute Toxicity for Organism Group
Organism Group Average Acute Toxicity Acute Toxicity Range
HoneybeesNot AcutelyT ToxicNot AcutelyT to Slightly Toxic
Note: Population-level effects on honeybees may occur even if a pesticide has low acute toxicity. For example, certain pesticides interfere with honeybee reproduction, ability to navigate, or temperature regulation, any of which can have an effect on long-term survival of honeybee colonies. The neonicotinoids, pyrethroids and keto-enol pesticides are some types of pesticides causing one or more of these effects.
Honeybee Chronic Toxicity

Sorry, no honeybee chronic toxicity data available for this chemical. Try related chemicals.

Related Chemicals for Chlormequat chloride

CAS Number Relation Reason Chemical Name Chem Detail Symptoms California Use Chem Use Type U.S. EPA Reg PAN Bad Actor
999-81-5 Parent P Chlormequat chloride View View View Plant Growth Regulator Yes Yes
7003-89-6 Related 1 Chlormequat View View View Plant Growth Regulator No Not Listed
67-48-1 Related 2 Choline chloride View View View Rodenticide No Not Listed
22232-15-1 Related 2 Phenyl 2-trimethylammonium ethanesulfonate methyl sulfate View View View Microbiocide, Adjuvant, Fungicide, Insecticide No Not Listed
Working with the Information on this Page

Click on underlined terms for definitions or go to the Pesticide Tutorial overview page.

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* Data marked with an asterisk indicates that this chemical is not explicitly listed on the corresponding list. Instead, it belongs to a group of chemicals that IS designated on the list. For example, if an agency assigns a classification of reproductive toxicant to "mercury compounds", that classification is applied to all mercury compounds in the PAN Pesticide database, which are then marked with an asterisk.

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