Definition of action level
: the level of concentration of a harmful or toxic substance or contaminant (such as lead, asbestos, benzene, or radiation) that when exceeded is considered sufficient to warrant regulatory or remedial action Two-thirds of the more than 6,000 homes it tested in 2003 had lead levels exceeding the Environmental Protection Agency's “action level”—the safety level at which federal law requires a water system to take prompt steps to reduce lead levels and notify the public. — Erik D. Olson, Washington Post, 8 Feb. 2004 Future clam digs are dependent on marine toxin levels, but the first set of samples dug last Sunday showed all results were still below the action level. — Mark Yuasa, Seattle Times, 25 Oct. 2009
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First Known Use of action level
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