With increasing emphasis of nutrient management plans, there is greater utilization of soil testing and increased attention focused on the quality of the results thereof. In 2003 representatives of the NAPT (North American Proficiency Testing Program) and the NRCS jointly met to discuss the laboratory quality. From this meeting a pilot program was established in the Western United States to evaluate the performance of soil testing labs. Lab performance was assessed based on six major soil tests with specific emphasis on extractable nitrate and phosphorus. In addition laboratory NAPT quarterly results, reports and reporting units were also addressed. In 2004 twenty-one labs enrolled in the program. Double-Blind (DB) soil samples of known analysis were selected from the NAPT archives and submitted to participating laboratories. Lab performance was evaluated based on a 90% confidence limit of the median value and a weighting for each analysis. Results indicate a mean proficiency score of 89% with sixteen laboratories successfully meeting the Pilot program requirements. Four laboratories failed to meet a 80% proficiency score and were retested in early 2005. For calender year 2005, four additional laboratories have enrolled in the PAP Program.