Wisconsin Administrative Code
Department of Natural Resources
NR 100-199 - Environmental Protection General
Chapter NR 149 - Laboratory Accreditation
Subchapter V - Proficiency Testing
Section NR 149.24 - Proficiency testing samples for applications and accreditation renewal

Universal Citation: WI Admin Code ยง NR 149.24

Current through August 26, 2024

(1) PT SAMPLE ACCEPTANCE CRITERIA. The department may not grant or renew an accreditation unless the associated PT sample results meet the criteria specified in s. NR 149.27.

(2) PT SAMPLE STUDY CLOSE DATE. Acceptable PT samples shall have a PT sample study close date no more than six months prior to the date of application.

(3) PT SAMPLE DUE DATE FOR RENEWAL. For renewal of accreditations, which begin on September 1 of each calendar year, acceptable PT sample results shall have been reported electronically to the department by an approved PT sample provider no sooner than January 1 or later than August 31 of the same calendar year. Preliminary reports from approved PT sample providers may not be used for renewal of accreditation.

Note: For example, to renew accreditation for any analyte effective for the period from September 1, 2009 to August 31, 2010, a laboratory shall have successfully analyzed a PT sample for that analyte reported between January 1 and August 31, 2009.

(4) PT SAMPLES FOR APPLICATIONS. A laboratory submitting initial or revised applications for accreditation shall analyze PT samples from an approved PT sample provider and submit acceptable results for any of the following:

(a) For aqueous and non-aqueous matrices, acceptable PT sample results are required for each combination of technology and analyte or analyte group for which the department has identified that PT samples are required.

(b) For the drinking water matrix, acceptable PT sample results, from a water supply study, are required for each combination of method and analyte or analyte group.

(5) PT SAMPLES FOR RENEWAL. A laboratory wishing to renew its accreditation shall analyze PT samples from an approved PT sample provider and submit acceptable results for any of the following:

(a) For aqueous and non-aqueous matrices, acceptable PT sample results from a water pollution study are required for each combination of technology and analyte or analyte group for which the department has identified that PT samples are required.

(b) For the drinking water matrix, acceptable PT sample results from a water supply study are required for each combination of method and analyte or analyte group.

Note: The department does not accept PT samples prepared in a non-aqueous matrix to obtain or renew accreditation for analytes or analyte groups under the non-aqueous matrix.

(6) RENEWAL REQUIREMENTS FOR MULTIPLE SUCCESSIVE PT SAMPLE FAILURES.

(am) A laboratory that experiences multiple successive PT sample failures shall submit two consecutive acceptable PT samples from an approved PT sample provider to renew its accreditation. Consecutive PT samples shall be two unique studies received by the laboratory at least ten business days apart. The laboratory may not prepare or analyze the two PT samples in the same batch.

(bm)
1. For aqueous and non-aqueous matrices, multiple successive PT sample failure means failing three consecutive PT samples for any combination of technology and analyte or analyte group.

2. For the drinking water matrix, multiple successive PT sample failure means failing two consecutive PT samples for any combination of method and analyte or analyte group.

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