AbstractThe movement of several pesticides was studied from 1985 to 1987 in a small, agricultural watershed The watershed contained a distinct, ephemeral stream bed and two permanent, small reservoirs The five herbicides measured −2,4 dichlorophenoxyacetic acid (2,4 D), dicamba, bromoxynil, diclofop‐methyl, and triallate – were those most commonly used in the watershed Of the 105 collected ground water samples 47 contained residues of one or more herbicides Residues in surface water samples were less frequent, and concentrations were lower than those in ground water All spring snowmelt runoff samples were collected in 1985 and 1987 and contained some pesticide residues The significance of these findings will be discussed and related to potential environmental toxicological effects Severe grasshopper infestations in 1985 and 1986 resulted in insecticide treatments in the study area Water samples were tested for the insecticides carbofuran, carbaryl, chlorpyrifos, dimethoate, and deltamethrin Three samples of spring runoff, collected from one site in 1987, contained approximately 1 ppb carbofuran All other samples were less than the detection
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