Greenhouse tests on a model cranberry bog demonstrated that a 4-hour flood, if applied 24 hours after treating the bog with either diazinon-C14 or parathion-S35, will result in translocation of the chemicals off the bog into the surrounding environment. Persistence of the chemicals in the water was established up to 144 hours, after which recordable amounts could not be obtained. Exposure of fish (Fundulus heterocletus L.) and fresh water mussels (Elliptio complanatus Solander) to these contaminated waters demonstrated the accumulation of the chemicals to amounts far in excess of that present in the surrounding water. No labeled degradation products of diazinon-C14 could ever be detected in the water or the organisms. Three labeled metabolic products of parathion-S35 were found in the water, one of which corresponded to amino-parathion. In the fish, a labeled degradation product of parathion was detected, however its exact composition is unknown. In the rate of metabolic breakdown of both chemicals, it appears the fish are capable of doing so at a faster rate than the mussels.