3. Where can laboratories get test samples?

Laboratories (in-house and contract) may order the required DMR-QA Study samples from a Proficiency Test (PT) Provider accredited by the American Association for Laboratory Accreditation (A2LA) or the ANSI National Accreditation Board (ANAB). A list of chemistry, microbiology and Whole Effluent Toxicity (WET) accredited PT Providers is included in the DMR-QA package.