This source is the April 1, 2024 CFR edition of FDA’s bottled-water standard of identity and quality regulation at 21 CFR 165.110. Paragraph (b)(4) sets allowable chemical-quality levels for inorganic substances in bottled water, and paragraph (b)(5) sets radiological quality requirements including uranium. Arsenic, chromium, and mercury are stated without CSV-controlled speciation splits and are recorded as tAs, Cr-total, and tHg under the bulk-ingest rule. Uranium is documented on the regulation page but gap-logged rather than loaded because U is outside the current regulatory_limits.csv metal-species vocabulary.
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