What is a mandatory step in collecting a routine distribution sample for bacteriological testing?

Using an approved, sterile sample container is a critical requirement for collecting a routine distribution sample for bacteriological testing. This step ensures that the sample is uncontaminated and accurately represents the water quality at the time of testing. Sterile containers are essential because any introduction of contaminants can lead to false positives for bacteria, invalidating the sample results and compromising the reliability of the water quality assessment.

The integrity of the sample is paramount in bacteriological testing, as the presence of bacteria is often a key indicator of water safety and potability. Therefore, utilizing a proper container that meets established standards helps ensure compliance with regulatory requirements and accurately reflects the actual conditions of the water supply.