The DOST-RSTL was provided with three samples examined by its analysts. The results were in turn verified by the National Reference Laboratory-East Avenue Medical Center (NRL-EAMC). Submitted results were analyzed using the Metrology of Qualitative Chemical Analysis (MEQUALAN), in which “0” mark is given for every correct answer.

With the mandate to protect the health and welfare of the public, the Department of Health (DOH) directed the NRL-EAMC to implement the PT Program for all accredited water testing laboratories nationwide. The PT aims to ensure the accuracy, precision, and reliability of results generated by drinking water testing laboratories.