How often should water quality samples be tested in distribution systems?

Testing water quality samples in distribution systems at least once a month is crucial to ensure the safety and quality of drinking water. Regular testing helps in early detection of contaminants and maintains compliance with regulatory standards set by agencies such as the Environmental Protection Agency (EPA) and state health departments. Monthly testing provides an adequate frequency to monitor changes in water quality that could arise due to seasonal variations, changes in source water, or operational adjustments in the distribution system. This proactive approach enables water providers to address any issues that may affect public health and water safety before they escalate, ensuring that the water supply remains safe for consumers.