A new method based on probe sonication extraction(USP)prior to high performance liquid chromatography(HPLC) has been developed for the determination of linear alkylbenzene sulfonates (LAS) form sewage sludge. The optimized method was designed to be cost effective compared to existing extraction methods (ultrasonic assisted extraction, Soxhlet or pressurized liquid extraction) which may require large quantities of organic solvents, or costly instrumentation or equipment.