Voluntary standards for levels of contaminants in drinking water established by NSF International in conjunction with the American Water Works Association, the Conference of State, Health, and Environmental Managers (COSHEM), and the Association of State Drinking Water Administrators (ASDWA). Generally equivalent to 10% of the maximum contaminant level (MCL) from EPA’s Primary Drinking Water Standards issued under the Safe Drinking Water Act. Intended as third-party standards for evaluating the health effects of additives to drinking water.

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