Today, preserving water resources, the most crucial thing that mankind needs, has been the center of attention of different international circles. The increasing growth of the population and consequently excessive use of the limited water resources on one side and the contamination of these resources due to different biological, agricultural and industrial activities on the other side, all lead to a kind of prediction for water-shortage crisis in the future.

ISO/ IEC 17025 is a standard that was established in the year 2000, and insists on consistent quality improvement. Its goal is to control the activities of sampling laboratories, calibrating with the concern to both qualitative and technical aspect. The most important achievement of such kind of standard for a laboratory would be the reliability of the testing results. Accordingly, the crediting organization does its assessments based on the testing results accuracy.