Since 1998, Soil Science Society of America's (SSSA) non-profit North American Proficiency Testing (NAPT) program has supported the agricultural testing sector under the guidance of an 18-member Oversight Committee of analytical experts from diverse labs and organizations. 

At its core, NAPT administers quarterly sample exchanges of soil, plant, and water collected nationwide to help agricultural and environmental testing laboratories with quality assurance. 

• Laboratories participate in blind and double-blind statistical evaluations and reports, and NAPT furnishes guidance and QA/QC tools to improve testing performance.
• NAPT helps agricultural and environmental laboratories leverage participation and assure clientele of high-quality data.
• Participating laboratories benefit from the scientific resources of the Soil Science Society of America (SSSA).
• The Performance Assessment Program (PAP) is a voluntary add-on for accreditation with programs which require certifications in a specific test or analyte (e.g., USDA-NRCS, State-level certifications).

If you'd like more general information about NAPT, view the information sheet for pricing and other details. If you'd like to find out more about how your laboratory or research team might participate, fill out an online enrollment form, and we will connect with you!

View the 2024 Information Sheet  |  Learn about enrollment