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TNI Standards

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Prices have been established for members of TNI and for the general public.  You may join TNI and purchase the standards at the discounted member prices. Any Patron level organizational member of TNI will receive a network version of all of the combined documents as part of their annual membership fee.  Any Sponsor level organizational member of TNI will receive a network version of Volume 1 and a single copy of Volume 2 as part of their annual membership fee.   An organization participating at the Partner level may select one free single-use volume each year. Individual members may purchase copies of the Standards at member rates.

Some of the accreditation standards below contain language from ISO/IEC 17025 and 17011. The ISO language is shown in italics,. Any additional TNI language then follows, in plain text, as a NOTE or as an additional numbered standard item. The TNI standards are integrated documents containing language from relevant ISO standards and language developed by TNI expert committees. The purchase of the integrated TNI documents eliminates the need to purchase a separate copy of the relevant ISO/IEC standard.

If you are a TNI member, do not order the standard from this page. Instead, use the purchase button on the members-only page to receive a $50 discount for each standard purchased.

Laboratory Accreditation Standards
Volume 1: Management and Technical Requirements for Laboratories Performing Environmental Analysis
Single Use version:$130
Network version: $320

Volume 2: General Requirements for Accreditation Bodies Accrediting Environmental Laboratories
Single Use version:$130
Network version: $320

Volume 3: General Requirements for Environmental Proficiency Test Providers
Single Use version:$120
Network version: $300

Volume 4: General Requirements for an Accreditor of Environmental Proficiency Test Providers
Single Use version:$120
Network version: $300

Field Activities Standards
Volume 1: General Requirements for Field Sampling and Measurement Organizations
Single Use version:$130
Network version: $320

Volume 2: General Requirements for Accreditation Bodies Accrediting Field Sampling and Measurement Organizations
Single Use version:$130
Network version: $320

Stationary Source Audit Sample Program Standards
Volume 1, Module 1: General Requirements for Stationary Source Audit Sample Providers
Volume 1, Module 2: General Requirements for an Accreditor of Stationary Source Audit Sample Providers
Volume 1, Module 3: Requirements for Participation in the TNI Stationary Source Audit Sample Program
Single Use version:$120
Network version: $300

A network version for additional sites (defined by zip code) may be purchased for a one time fee of $40 per site.

The Standards adopted by the National Environmental Laboratory Accreditation Conference (NELAC) in 2003 are being phased out, but will continue to be the applicable standards until the new TNI standards have been implemented by a particular accreditation body.


TNI has established an avenue for resolution of questions submitted electronically on interpretation of the 2003 NELAC Standard. Click here to view responses to requests that were previously submitted. Click here to submit a new request.

Accreditation standards are developed by Expert Committees using a consensus process that includes the elements of openness, balance, due process, and consensus as established by Circular A-119 published by the US Office of Management and Budget.

Circular A-119 defines a voluntary consensus standards body as one having the following attributes:

(i)openness; (ii) balance of interest; (iii) due process; (iv) an appeals process; and (v) consensus, which is general agreement, but not necessarily unanimity, and includes a process for attempting to resolve objections by interested parties, as long as all comments have been fairly considered, each objector is advised of the disposition of his or her objection(s) and the reason(s) why, and the consensus body members are given an opportunity to change their votes after reviewing the comments.

Standards are developed by the TNI Consensus Standards Development Program (CSDP), in conformance with TNI’s Procedures Governing Standards Development. The American National Standards Institute (ANSI) recently approved the TNI process for standards development indicating that TNI meets the ANSI requirements. This means the TNI standards are developed through an open consensus process in which all members and the public may provide input and have their position considered, preventing dominance by any one group of stakeholders by assuring a balance of interests among the committee members who develop the standards. The Expert Committees (Proficiency Testing; On-Site Assessment; Quality Systems; Accreditation Body; and Field Activities) each develop a Working Draft Standard that is presented to the membership and the public at the TNI Forum on Laboratory Accreditation. As a result of input received during and following that open meeting, the Expert Committees modify their Working Draft Standard to produce the Voting Draft Standard. All TNI members may then vote electronically, providing comments in support of their positive or negative votes. The Expert Committees must allow for public debate on every comment at the next Forum on Laboratory Accreditation. The Expert Committees hold meetings to rule each comment persuasive or non-persuasive and publish a Response to Comments document.

Committees must resolve every persuasive comment, which may require modification of the standard. Some comments may suggest major changes to the standard (e.g., reduce proficiency test frequency to once per year instead of twice per year), and they may be placed on hold until the next standards revision cycle to allow consideration and debate by the membership and the public.

When persuasive comments are resolved and the standard modules are approved by a majority vote of the Committee Members, the standard then becomes final as the TNI Standard.

After a standard has been adopted by an expert committee, it undergoes an editorial review for consistency and then is published on the TNI website. After publication, TNI must allow thirty days for appeals. The standards will be available for adoption and implementation after resolving appeals.

After resolution of appeals, the standard may be used by any organization. However, for use within TNI’s National Environmental Laboratory Accreditation Program (ELAP), the TNI Laboratory Accreditation System Committee (LASC) reviews the adopted TNI Standard and develops supplementary documents (guidance, SOPs, etc.), when needed. The LASC then forwards the standards to the TNI NELAP for this program to adopt the standard for use by all Accreditation Bodies (ABs). TNI expects NELAP ABs will require a lead time of about two years to amend regulations and implement the standard. Because modifying regulations is restrictive and time-consuming, the current NELAP ABs may possibly continue to accredit laboratories to the 2003 NELAC standards until the year 2010, when their proposed regulations are finalized to allow accreditation to the TNI standard.

Posted are the vote tallies and response-to-comments documents, explaining the resolution of all written comments that accompanied the vote on the current standards.

The NELAC Institute (TNI ) Procedures for Expert Committee Operations describe how any TNI member may participate, as an Associate Committee Member, in conference calls of any Expert Committee. The dates/times of scheduled calls are listed on each Expert Committee’s web page as well as on the Event Calendar

In order to participate in any forthcoming conference calls, you should register with the chair of the Expert Committee(s) of interest. You will then receive an invitation to each conference call, together with an abbreviated agenda and any documentation pertinent to the meeting. If you wish to attend, you must so notify the chair at least 24-hours in advance of the meeting. You will then be provided with the call-in number and a telephone line will be made available for you.