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Laboratory certification for PFAS

The Department of Natural Resources accredits laboratories to perform aqueous (non-potable water), solid and drinking water testing for many of the agency's environmental programs. Certified and registered laboratories must meet all the criteria outlined in Ch. NR 149, Wis. Adm. Code.

Accreditation options

There are two options available for PFAS accreditation of laboratories in Wisconsin.

Drinking water matrix

Must be performed using EPA 537.1.

  • PFOS and PFOA by EPA 537.1
  • PFAS (group) — EPA 537.1 (which includes all 18 compounds specified in EPA 537.1)
Aqueous and solid matrices

Follow your own method SOP along with the WI PFAS Method Suitability document.

  • PFOS and PFOA by LC/MS technology (this technology includes LC/MS/MS)
  • 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

  1. Create and follow an EPA Method 537.1 SOP.
  2. Perform the IDC required by the method for each analyst that performs the method.
  3. Report sample results to the MRL, and report blanks to one-half the MRL.
  4. Send a copy of your draft application form (4800-002) to DNRLABCERT@wisconsin.gov so that the application fee can be reviewed before a check is provided.
  5. Submit a completed application packet to the department.
    • Include form (4800-002) from our website along with the required fee.
    • Submit a completed SSN/FEIN form (9400-568) from our website if your laboratory does not currently maintain WI accreditation.
    • Submit a completed application attachment A3 form from our 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 to get a passing grade for the group. Also, PFOS and PFOA each must pass.
    • 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/solid matrices

  1. Create and follow your own method SOP that includes the WI PFAS Method Suitability document.
  2. Perform the IDC by the WI PFAS Method Suitability 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 DNRLABCERT@wisconsin.gov so that the application fee can be reviewed before a check is provided.
  5. Submit a completed application packet to the department.
    • Include form (4800-002) from our website along with the required fee.
    • Submit a completed SSN/FEIN form (9400-568) from our website if your laboratory does not currently maintain WI accreditation.
    • Submit a completed application attachment A1 form from our website if you want PFAS accreditation in the aqueous (non-potable waters) matrix.
    • Submit a completed application attachment A2 form from our website if you want PFAS accreditation in the solid matrix.
    • Submit a passing “WP” PT for PFAS for aqueous/solid matrices using your own method along with the WI PFAS Method Suitability 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 to get a passing grade for the group. Also, PFOS and PFOA each must pass.
    • 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 DNRLABCERT@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

Last revised: Thursday February 06 2020