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PFAS certification

The Wisconsin Department of Natural Resources is offering certification for PFAS in drinking water (potable water), aqueous (non-potable water), and solid matrices.

Labs that currently hold WI DNR PFAS certification can be found here: WI PFAS Certified Laboratories

As of March 1, 2021, the DNR no longer expects regulated entities, unless otherwise directed by DNR, to sample for or laboratories to report three of the 36 PFAS compounds on the default PFAS list. Read an update and view the full list.

Certification options

The matrix and analyte options available for PFAS certification in Wisconsin are listed below.

Drinking water matrix
  • PFAS (group) by EPA 537.1 (includes 18 compounds specified in EPA 537.1)
Aqueous and solid matrices

Follow the lab's in-house isotope dilution method utilizing the WI PFAS Aqueous and Non-Aqueous Matrices Method Expectations document.

  • PFAS (group) by LC/MS technology (includes all 36 compounds for which WI is accrediting — laboratories may obtain this accreditation and report fewer compounds than the 36)

Steps required to obtain WI accreditation for PFAS

Drinking water matrix

  1. Create and follow an EPA Method 537.1 SOP.
  2. Perform the IDC required by the method.
  3. Report sample results to the MDL and include the MDL and MRL. Report blanks to the MDL.
  4. Send a copy of your draft application form (4800-002) to Tom.Trainor@wisconsin.gov so that the application fee can be reviewed before a check is written.
  5. Submit a completed application packet to the department.
    • Include application form 4800-022 from the WI DNR Lab Certification website along with the required fee.
    • Submit a completed SSN/FEIN form (9400-568) from the website if your laboratory does not currently maintain WI accreditation.
    • Submit a completed application attachment A3 form from the website if you want PFAS accreditation in the drinking water matrix.
    • Submit a passing "WS" PT for PFAS for drinking water using EPA 537.1. The PT must be no more than six months older than the date that the application was received. The lab must pass 80% of the spiked analytes (6 analytes, at a minimum, must be spiked in the PT and PFOS and PFOA each have to be one of those 6 analytes spiked in the PT) to get a passing grade for the group. PFOS and PFOA each must have an acceptable result (not ND).
    • If this is your initial application with WI then submit a copy of your quality manual, an equipment list for the accreditations sought, and proof of intent to perform work in WI.
    • Submit your MDL summaries for each PFAS you will be reporting.
    • Submit a copy of your IDC records.
  6. Your application will be reviewed for completeness and then an on-site evaluation will be scheduled.
  7. Any major deficiencies identified on site will need to be reconciled before accreditation will be granted.

Aqueous and solid matrices

  1. Create and follow the lab's in-house method SOP that utilizes the WI PFAS Aqueous and Non-Aqueous Matrices Method Expectations document.
  2. Perform the IDC in conformance with the WI PFAS Aqueous and Non-Aqueous Matrices Method Expectations document for each analyst that performs the method.
  3. Report sample and blank results to the MDL.
  4. Send a copy of your draft application form (4800-002) to Tom.Trainor@wisconsin.gov so that the application fee can be reviewed before a check is written.
  5. Submit a completed application packet to the department.
    • Include application form 4800-002 from the WI DNR Lab Certification website along with the required fee.
    • Submit a completed SSN/FEIN form (9400-568) from the website if your laboratory does not currently maintain WI accreditation.
    • Submit a completed application attachment A1 form from the website if you want PFAS accreditation in the aqueous (non-potable waters) matrix.
    • Submit a completed application attachment A2 form from the website if you want PFAS accreditation in the solid matrix.
    • Submit a passing "WP" PT for PFAS for aqueous/solid matrices using the lab's own method that utilizes the WI PFAS Aqueous and Non-Aqueous Matrices Method Expectations document. The WP PT study will satisfy both the aqueous and solid PT requirements. The PT must be no more than six months older than the date that the application was received. The lab must pass 80% of the spiked analytes (6 analytes, at a minimum, must be spiked in the PT and PFOS and PFOA each have to be one of those 6 analytes spiked in the PT) to get a passing grade for the group. PFOS and PFOA each must have an acceptable result (not ND).
    • If this is your initial application with WI then submit a copy of your quality manual, an equipment list for the accreditations sought, and proof of intent to perform work in WI.
    • Submit your MDL summaries for each PFAS you will be reporting.
    • Submit a copy of your IDC records.
  6. Your application will be reviewed for completeness and then an on-site evaluation will be scheduled.
  7. Once the program has determined that your method is suitable, accreditation will be granted.

Application materials can be emailed to Tom.Trainor@wisconsin.gov instead of regular US Mail (except the check for fees).

If your laboratory is interested in accreditation for the drinking water matrix and aqueous (non-potable waters) and/or the solid matrix, only one application is needed to cover all these matrices.

Out-of-state laboratories will be billed for travel costs associated with the on-site evaluation which includes transportation, lodging, and meal costs.

More information

Contact information
Tom Trainor
Program chemist
Certification Services

DNR LabCert mailbox