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Laboratory Accreditation

Certification & Registration

The DNR accredits laboratories to perform aqueous (non-potable water), solid, and drinking water (potable water) testing for many of the agency's environmental programs. Accreditation is available as a certified laboratory (can perform testing on compliance samples for other facilities) and as a registered laboratory (performs testing on their own samples only).

Latest Program Updates

Latest updates from the WI laboratory accreditation program

Lists of Certified Labs

Download Excel and PDF files of WI laboratory certifications by area of interest

Applications for PFAS Certification

WI application information specific to PFAS certification

Applications for Registration and Certification

WI application information to perform environmental chemistry testing

Private Well Testing

Information and resources for homeowners related to private well testing


Information and resources related to performing laboratory testing

Proficiency Testing

Resources related to WI PT requirements

Spreadsheets, Forms and Document Templates

Resources for performing laboratory testing

Method Detection Limit (MDL)

Resources specific to MDL determinations
Method Detection Limit (MDL)

Laboratory Standards Review Council

Council meeting announcements and minutes
Laboratory Standards Review Council

Analyte Groups Definitions

Information on which compounds are included in the analyte groups offered
Analyte Groups Definitions

Annual Renewal

Registration and certification requirements for annual renewal
Annual Renewal

Lab of the Year Award

Past award winners and a description about the award
Lab of the Year Award