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Heavy Metal Index
A sealed unmarked clear solution bottle and a separate closed vial containing colorless liquid illustrating California SWRCB 2024 water regulation research context.

California SWRCB DDW-21-003 Hexavalent Chromium MCL regulation text

The February 2024 regulation text amends California Code of Regulations section 64431, Table 64431-A, for primary maximum contaminant levels for inorganic chemicals in public water systems. HMI records the metal and metalloid MCL rows in the table, including the newly adopted hexavalent chromium MCL.

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