What does AL stand for in water quality terminology?

In water quality terminology, AL stands for Action Level. This term is crucial as it refers to the maximum concentration of a contaminant that is allowed in drinking water before action must be taken by the water supplier. When a contaminant exceeds the action level, certain regulatory steps must be implemented to ensure that the water supply is safe for public consumption.

For instance, in the context of lead and copper rule requirements, if the concentration of lead in a water sample exceeds the action level, it triggers a necessity for further testing, public notification, and potential remediation actions to protect public health. Understanding this concept is essential for water operators who must monitor and manage water quality to comply with health standards and regulations, safeguarding the community they serve.