Laboratory Certification
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Frequently Asked Questions
The laboratory accreditation program fields many questions from laboratory staff each day. Although it is not realistic to capture every question and its accompanying answer, this section of our website strives to capture those questions that are…
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BOD Analysis
BOD provides a measure of the impact of a waste (water) on the oxygen content in a receiving water body. Wastes (organic matter, "food") are broken down (decomposed, oxidized, metabolized) by microbial organisms (aerobic bacteria), frequently…
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Applications for Registration and Certification
Applications are for direct accreditation with the Wisconsin Department of Natural Resources (DNR).The DNR is not a National Environmental Laboratory Accreditation Program (NELAP) accrediting authority. The DNR does not recognize NELAP…
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Training
These resources are provided as guidance and may not reflect current acceptable practices in compliance testing.
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Private Well Water Testing
Locating a laboratory to perform drinking water testing can be a confusing proposition. The phone book will likely provide a list; however, you may want the laboratory you choose to be credentialed in some manner. Testing to Have Performed on…
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Proficiency Testing (PT)
Proficiency testing samples are prepared by an approved, third party vendor to contain a known (only to the vendor) concentration of one or more target analytes.
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Spreadsheets, forms, checklists and documents
The laboratory can customize these spreadsheets, forms, checklists and documents to help with laboratory testing and fit their needs.
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NR 149 Code Updates
An update to administrative code, chapter NR 149, has been completed. This update was published on March 1, 2021. The effective date is June 29, 2021. NR 149 - June 2021 On March 19, 2021, Brandy Baker-Muhich provided a Webinar on how this new…
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Method Detection Limit (MDL)
"Method detection limit," or "MDL," means the minimum measured concentration of a substance that can be reported with 99% confidence that the measured concentration is distinguishable from method blank results. The MDL is generated according to the…
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Analyte Groups
"Analyte group" means a set of analytes that can be determined using the same method or technology and that constitutes a unit, acknowledged by the department, of the third tier of accreditation under s. NR 149.13 (4).The selection of an analyte…