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Sewage sludge from the extended aeration municipal wastewater treatment plant of Kalamata (Greece), dewatered and dried was tested for potential land application. Experiments were carried out simulating rainfall, one low-rate high-duration at 20 mm/d, and one high-rate low-duration at 6.6 mm/d. Leachate was collected and analyzed as a function of accumulated rainfall. The sludge was found suitable for agricultural uses on the basis of the relevant EEC Directive. Leachates contained P and heavy metals well above the allowable limits for discharge, implying that transport through the soil can be decisive on the likelihood of groundwater contamination. High-rate low-duration rain events give higher contaminant concentrations in the accumulated leachates.