Withdrawal From Federal Regulations of Arsenic Criteria Applicable to Idaho

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In 1992, EPA promulgated federal regulations establishing water quality criteria for toxic pollutants for several states, including Idaho (40 CFR 131.36). Idaho has now adopted, and EPA has approved, human health water quality criteria. In this action, EPA is proposing to withdraw the human health criteria for arsenic applicable to Idaho. EPA is providing an opportunity for public comment on withdrawal of the federal criteria because the State's arsenic criteria differ from the federal criteria. In a related action published in the final rule section of this issue of the Federal Register, EPA is amending the federal regulations to withdraw the human health criteria for those pollutants where Idaho has adopted criteria that are identical to the federal criteria.