Approved PT Provider Contact Information

Please make sure that the provider you select is approved for the specific analyte(s) for whichyou are seeking registration or certification (see attached table). When contacting providers,specify that you are seeking samples for use by the WDNR Laboratory Certification Program.

Absolute Standards Inc.

Analytical Products Group (APG)

Environmental Resource Associates (ERA)

NSI Solutions, Inc. (NSI)

New York Department of Health (NYDoH)

Resource Technology Corporation(RTC)

Wibby Environmental, Inc.

WI State Laboratory of HygieneProficiency Testing Program (WSLH)