ACLs

Water quality standards are frequently expressed in terms of ambient concentration. The regulatory agency determines ACLs, which are the maximum concentration of a contaminant in water to which people are exposed. The degree of human exposure depends upon the use of the water body. Thus, different ACLs apply to different water bodies. Generally, regulators derive ACLs from health effects information. Using ACLs, regulators can mathematically determine the maximum contribution that an ef-

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