How often should water quality samples be collected in a distribution system?

Water quality samples in a distribution system should typically be collected weekly to ensure the ongoing safety and compliance of the drinking water supply. Regular sampling allows for timely detection of any contaminants or changes in water quality that could pose a risk to public health. This frequency strikes a balance between gaining adequate data to monitor the system effectively and the practicalities of testing and analysis.

Collecting samples daily may be excessive and not feasible for most systems, whereas monthly or annual sampling intervals may not provide sufficient information to catch problems in a timely manner. Weekly sampling allows for a consistent overview of water quality trends and ensures any issues are addressed promptly to maintain safe drinking water standards.