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The purpose of this research is to investigate the feasibility of the modified waterworks sludge with loess as cover soil in sanitary landfill site. Modified sludge was experimentally produced with fly ash, cement, loess, and activated loess dosing. Uniaxial compression strength of modified sludges showed material property improvement applicable for soil cover alternatives. Heavy metals were analyzed in terms of leaching characteristics using techniques of Korean Standard Procedure and Toxicity Characteristics Leaching Procedure. Leaching tests for hazardous components in modified sludge revealed below the regulated criteria. When adding 20~30% activated loess to water treatment plant sludges, the modified sludges could reach the compression strength for cover soil after 7 days solidification.