Loyola University Chicago

Institute of Environmental Sustainability


LETL Lab Testing Accreditations

The Loyola Environmental Testing Lab is participating in third-party accreditation to ensure the quality of analytical testing and validation for results used in any research, reports, or application. LETL is currently accredited with the North American Proficiency Testing (NAPT) for soil testing.

North American Proficiency Testing Program (NAPT)
Soil Accreditation - May 2017

The North American Proficiency Testing (NAPT) Program (a program of the Soil Science Society of America) assists soil, plant and water testing laboratories in their performance through inter-laboratory sample exchanges and a statistical evaluation of the analytical data.

The program guidelines have been developed for the agricultural laboratory industry by representatives from groups familiar with and involved in standardizing methods and developing nutrient recommendations for soil and plant analysis methods within the U.S. and Canada. It is operated as an activity of the Soil Science Society of America and overseen by an oversight committee comprised of representatives of the above-mentioned groups. These include: Regional Soil and Plant Analysis Workgroups; Scientific Organizations; State/Provincial Departments of Agriculture; and private and public and plant analysis labs.