The longer a chemical can remain in water without breaking down, the more likely it is to leach through the soil. Although Treflan, like most pesticides, is not subject to rapid degradation by hydrolysis, it is not likely to leach because of its other physical properties. Susceptibility to hydrolysis is not desirable for a water applied herbicide because it could break down in your spray tank or before it has had the opportunity to work in your field. The soil half-life is less than 3 weeks. Soil half-life is an indication of how long the chemical remains active in the soil as a herbicide.
Several factors determine a herbicide's soil half-life.
Others, such as volatilization and plant uptake can also shorten half-life in the soil. Longer soil half-life allows full season weed control and fewer herbicide applications throughout the growing season. The overall assessment, when you consider all factors, is that Treflan is regarded as an immobile compound, and is not likely to leach into groundwater. Physical and Chemical Characteristics of Treflan and Parameters Used by EPA for Evaluation of Leaching Potential. Treflan has chemical and physical properties which make it highly unlikely to reach groundwater through leaching.