What does the term health advisory level (HAL) refer to in drinking water?

The term health advisory level (HAL) refers specifically to the maximum concentration of a contaminant in drinking water that is considered safe for consumption, particularly over a specified period. HALs are established to protect public health and provide guidance on the potential health effects associated with various contaminants. This means that when the concentration of a specific substance in the water exceeds the HAL, it may pose a risk to health and thus require action, such as remediation or alternate water supply measures.

HALs are not focused on operational guidelines for treatment plants, measurements of taste and odor, or standards for water pressure. Instead, they are strictly tied to health risk assessments and serve as a proactive measure to safeguard community health in relation to drinking water quality.