The Performance Assessment program (PAP) is a voluntary program offered as a service of the Soil Science Society of America (SSSA), Madison, WI, and operated as a part of the North American Proficiency Testing program (NAPT), and is administered by the NAPT Oversight Committee. While the PAP program is offered as a voluntary service to all soil testing laboratories, this program has been adopted by the NRCS as assurance that soil test analyses are being performed using validated testing methods. The PAP program is required by the NRCS for soil analysis laboratories analyzing soils for federal government programs involved with the development of nutrient management plans in certain Western US states.
To participate in the PAP program, participants must adhere to the PAP Ethics Declaration. When enrolling in the PAP program, please read, sign and return the Ethics Declaration.
View the list of PAP Certified Labs