Laboratory Accreditation Section Identifier

Laboratory Accreditation

Manual and Procedures for Accredited Laboratories

The Procedure Manual offers guidance for laboratories participating in the Environmental Laboratory Accreditation program and to users of data produced in these laboratories.

Accreditation of Environmental Laboratories is at Chapter 173-50 of the Washington Administrative Code.

Lab Accreditation Fee Schedule is at Chapter 173-50-190 of the Washington Administrative Code.


The National Environmental Methods Index (NEMI) database contains a searchable listing of methods, protocols, and procedures.

Drinking Water Analytical Methods is a reference website with EPA-approved methods for analyzing drinking water.

Identification of Test Procedures for analysis of pollutants in non-potable water is in the Federal Regulations in Title 40, Part 136.3.

 EPA Publication SW-846, "Test Methods for Evaluating Solid Waste, Physical/Chemical Methods" is online. It is the official compendium of analytical and sampling methods that have been evaluated and approved for use in complying with the Federal Hazardous Waste regulations.

SW846 On-line is a direct link to the test methods document.

Using Digital Reference Thermometers in Microbiology Testing Laboratories provides guidance to microbiology labs that wish to discontinue mercury-in-glass calibration.

Methods Update Rule discusses likely methods revisions from the US Environmental Protection Agency.

Technical Guidance for Laboratories Accredited for EPA Method 200.7 provides technical clarification to laboratories performing trace metals analysis by EPA Method 200.7.

Method Codes

Lab Search database will give you the Method Codes for the methods for which your lab is accredited. Search by the name of your lab and filter for the Method Code column.

TNI LAMS is the National Environmental Laboratory Accreditation Management System test methods database at The NELAC Institute. Find other method codes here for methods for which your lab is not accredited, but for which you would like to apply for accreditation.

Methods and Analytes Table in Excel allows lookup of accreditable methods in an interactive spreadsheet.

Proficiency Testing

Proficiency testing sample providers is a page that lists those who meet Washington State standards for proficiency testing samples.

Procedure Manual section on Proficiency Testing provides more detail.

Dissolved Oxygen Proficiency Tests are now required for those labs with dissolved oxygen testing in their scopes.

Requirements of Proficiency Testing Providers describes the need for electronic data delivery and other requirements.

Lab Codes

A Lab Code is necessary for accreditation and for proficiency test reporting. If your lab is located in Washington state, please call our office at (360) 871-8844 for your lab code. If your lab is not located in Washington, please call the lab accreditation office for the state in which your lab is located.

Quality Assurance Manual

The Quality Assurance Manual section (PDF) of the Procedure Manual gives tips and details for creating a Quality Assurance manual.

Model of a Quality Assurance Manual for a Small Wastewater Treatment Plant Laboratory gives an example QA Manual.

The QA Manual Review Checklist is offered to assist labs in creating their Quality Assurance manual.

Quality Control Tools

Bench Sheets and Control Charts for labs offers downloadable spreadsheet tools and guidance for labs.