What is a common requirement for all public drinking water systems?

Regular quality testing is a fundamental requirement for all public drinking water systems. This testing ensures that the water supply meets safety standards and regulations set by government entities, such as the Environmental Protection Agency (EPA) in the United States. By conducting regular quality tests, public water systems are able to monitor for contaminants and ensure the safe consumption of drinking water, protecting public health. Frequent quality testing helps to identify potential issues before they can affect consumers, enabling timely actions to remediate any problems with water quality.

While other options may contribute to the overall management and improvement of water systems, such as environmental audits, advanced treatment technologies, and community engagement, they are not universally mandated across all public drinking water systems like regular quality testing is.