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carbonate (Table IV; illustrative values of the Table III equations, footnote 1)"],"cite":{"instrument":"us_co_wqs","title":"Colorado Regulation No. 31 (5 CCR 1002-31) Basic Standards and Methodologies for Surface Water: Table B organic chemicals, Table III metals, Table IV metals at selected hardness","issuer":"State of Colorado, Water Quality Control Commission (Department of Public Health and Environment)","edition":"5 CCR 1002-31 effective December 31, 2024 (adopted August 21, 2024), the Secretary of State's official PDF; US EPA posts the same compilation in effect for CWA purposes (cover January 28, 2025: no action on the phased TN/TP provisions only)","source_url":"https://www.coloradosos.gov/CCR/GenerateRulePdf.do?ruleVersionId=11749&fileName=5%20CCR%201002-31","source_sha256":"af2f5ee73f74fa7f1cb168059b88977c13a07369665f6dc9b96633ff189855f9","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"5 CCR 1002-31 31.16 Table 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