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Laboratory tests were conducted to evaluate the utility of an automatic pumping sampler for assessing the transport and concentration of pesticides in suspended sediment. Pesticide‐sedimentwater mixtures were formulated with pesticide‐sediment ratios ranging from 1:15,000 to 1:500. After stirring periods of 10 and 60 min, these formulations were pumped through the sampler and aliquots collected for pesticide analysis. Recovery of DDT, trifluralin, toxaphene, and mirex exceeded 90%, based on their concentrations immediately prior to pumping. Adsorption of pesticides to the various plastic, rubber, and fiberglass sampler components was minimized by the high flow velocity and rapid delivery systems which ensured a short time of contact (seconds) between the sample and internal surfaces. These tests indicate that the sampler is suitable for use in evaluating the transport of relatively water‐insoluble pesticides in suspended sediment.