action level

In the United States, the term action level can refer to levels recommended by EPA for enforcement by Food and Drug Administration and USDA when pesticide residues occur in food or feed commodities for reasons other than the direct application of the pesticide. As opposed to "tolerances" which are established for residues occurring as a direct result of proper usage, action levels are set for inadvertent residues resulting from previous legal use or accidental contamination.
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The action level is the exposure level at which (USA) OSHA regulations take effect. This is generally one-half of the PEL

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The concentration of lead or copper in water specified at Code of Federal Regulations 141.80(c) which determines, in some cases, the treatment requirements contained in subpart I of this part that a water system is required to complete.

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