develop consensus standards for use by TNI's programs. This group has a support role in assisting other programs with activities such as guidance and standards interpretation.
fosters the generation of data of known and documented quality is through the National Environmental Laboratory Accreditation Program, or NELAP. The purpose of this program is to establish and implement a program for the accreditation of environmental laboratories.
is to establish and maintain a national PT program to support TNI’s National Environmental Laboratory Accreditation Program, and other activities.
Field Activities Program (NEFAP) Executive Committee is to establish and implement an accreditation program for field sampling and measurement organizations (FSMOs).
on a variety of topics of interest to the environmental measurement community. TNI also hosts two regularly scheduled meetings per year, typically in January and August. Both are a week long and involve open meetings of TNI committees as well as training courses and other special sessions.Notice of Revisions to TNI FoPT Tables – Whole Effluent Toxicity Testing; Effective May 19, 2026
Date Posted: 3-3-2026
The NELAC Institute (TNI) has approved and posted on the website (12-17-2025) changes referenced above. No comments were received. Following the required 45-day comment period the changes to Fields of Proficiency Testing (FoPT) tables for Whole Effluent Toxicity Testing in non-potable waters are to be effective on May 19, 2026.
Summary of Changes
Changes specifically address criteria for Non-NOEC analytes.
WETT_FoPT_2026_05_19_Rev 1.0.xlsx (Excel)
WETT_FoPT_2026_05_19_Rev 1.0.pdf (PDF)