{"query":{"parameter":"chromium total","place":"US-IA","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-IA","US"],"parameter_keys":["cas:7440-47-3","name:chromium total","name:chromium, total","name:chromium +3, total","name:chromium (+3)","name:chromium +6, total","name:chromium (+6)","cas:18540-29-9","cas:16065-83-1","name:total chromium","name:chrome total","name:chromium +6","name:chromium (vi) (freshwater) chromium (vi) marine","cas:92203-02-6","name:cromo totale"],"names_matched":[["chromium total","cas:7440-47-3"],["chromium total","name:chromium total"],["chromium total","name:chromium, total"],["chromium 3 total","name:chromium +3, total"],["chromium 3 total recoverable","name:chromium (+3)"],["chromium 6 total","name:chromium +6, total"],["chromium 6 total recoverable","name:chromium (+6)"],["chromium hexavalent total","cas:18540-29-9"],["chromium iii total","cas:16065-83-1"],["chromium iii total recoverable","cas:16065-83-1"],["chromium total hexavalent 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acid reaction products with aluminum hydroxide and chromium oxide cro3","cas:92203-02-6","chromium"],["total chromium","name:total chromium","chromium"],["cromo totale","name:cromo totale","cromo totale"]],"match":"exact+contains","order":"The place's own instruments first, then each place above it, each in its register's order; rows for a marine receiving water after the rest, as none of the place's own rows names a marine, salt, estuarine, coastal or ocean water"},"total":2707,"offset":0,"returned":50,"next_offset":50,"rows":[{"id":"f1a8ac0fb0c062f4","parameter":"Chromium (VI)","value":"11","value_num":11,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:18540-29-9","place":["US-IA"],"conditions":["receiving_water is freshwater","class B(CW1) waters: cold water aquatic life, type 1"],"cite":{"instrument":"us_ia_wqs","title":"Iowa Administrative Code 567—Chapter 61 Water Quality Standards: Table 1 criteria by use 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3"],"cite":{"instrument":"us_ia_wqs","title":"Iowa Administrative Code 567—Chapter 61 Water Quality Standards: Table 1 criteria by use designation, Table 2 dissolved oxygen, pH, Table 4 sulfate, and the livestock-watering ion guidelines kept in effect","issuer":"State of Iowa, Environmental Protection Commission (Department of Natural Resources)","edition":"567 IAC chapter 61, effective February 2, 2022 (IAC 2/9/22), as US EPA posts it in effect for CWA purposes (cover February 13, 2023: 61.3(2)\"g\" kept in effect, EPA having reserved action on its removal; part of 61.3(3)(a)(1) disapproved)","source_url":"https://www.epa.gov/system/files/documents/2024-03/ia-chapter61-2023.pdf","source_sha256":"6d136ce607bf1fc6c839c1cea688892f0a113214bf6026fddab9f18e72d4c0d9","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"567 IAC 61.3(3) Table 1","page":15,"quote":"Chromium(VI) Chronic(p) 11 — 11 11 11 11 — 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disapproved)","source_url":"https://www.epa.gov/system/files/documents/2024-03/ia-chapter61-2023.pdf","source_sha256":"6d136ce607bf1fc6c839c1cea688892f0a113214bf6026fddab9f18e72d4c0d9","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"567 IAC 61.3(3) Table 1","page":15,"quote":"Chromium(VI) Chronic(p) 11 — 11 11 11 11 — —"}},{"id":"cd48ba9ac7b700fc","parameter":"Chromium (VI)","value":"16","value_num":16,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:18540-29-9","place":["US-IA"],"conditions":["receiving_water is freshwater","class B(CW1) waters: cold water aquatic life, type 1"],"cite":{"instrument":"us_ia_wqs","title":"Iowa Administrative Code 567—Chapter 61 Water Quality Standards: Table 1 criteria by use designation, Table 2 dissolved oxygen, pH, Table 4 sulfate, and the livestock-watering ion guidelines kept in effect","issuer":"State of Iowa, Environmental Protection Commission (Department of Natural Resources)","edition":"567 IAC chapter 61, effective February 2, 2022 (IAC 2/9/22), as US EPA posts it in effect for CWA purposes (cover February 13, 2023: 61.3(2)\"g\" kept in effect, EPA having reserved action on its removal; part of 61.3(3)(a)(1) disapproved)","source_url":"https://www.epa.gov/system/files/documents/2024-03/ia-chapter61-2023.pdf","source_sha256":"6d136ce607bf1fc6c839c1cea688892f0a113214bf6026fddab9f18e72d4c0d9","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"567 IAC 61.3(3) Table 1","page":15,"quote":"Acute(p) 16 — 16 16 16 16 — —"}},{"id":"da5314d5ec35d19f","parameter":"Chromium (VI)","value":"16","value_num":16,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:18540-29-9","place":["US-IA"],"conditions":["receiving_water is freshwater","class B(WW-1) waters: warm water aquatic life, type 1"],"cite":{"instrument":"us_ia_wqs","title":"Iowa Administrative Code 567—Chapter 61 Water Quality Standards: Table 1 criteria by use designation, Table 2 dissolved oxygen, pH, Table 4 sulfate, and the livestock-watering ion guidelines kept in effect","issuer":"State of Iowa, Environmental Protection Commission (Department of Natural Resources)","edition":"567 IAC chapter 61, effective February 2, 2022 (IAC 2/9/22), as US EPA posts it in effect for CWA purposes (cover February 13, 2023: 61.3(2)\"g\" kept in effect, EPA having reserved action on its removal; part of 61.3(3)(a)(1) disapproved)","source_url":"https://www.epa.gov/system/files/documents/2024-03/ia-chapter61-2023.pdf","source_sha256":"6d136ce607bf1fc6c839c1cea688892f0a113214bf6026fddab9f18e72d4c0d9","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"567 IAC 61.3(3) Table 1","page":15,"quote":"Acute(p) 16 — 16 16 16 16 — —"}},{"id":"98c1fdaffbb6da3d","parameter":"Chromium 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(Department of Natural Resources)","edition":"567 IAC chapter 61, effective February 2, 2022 (IAC 2/9/22), as US EPA posts it in effect for CWA purposes (cover February 13, 2023: 61.3(2)\"g\" kept in effect, EPA having reserved action on its removal; part of 61.3(3)(a)(1) disapproved)","source_url":"https://www.epa.gov/system/files/documents/2024-03/ia-chapter61-2023.pdf","source_sha256":"6d136ce607bf1fc6c839c1cea688892f0a113214bf6026fddab9f18e72d4c0d9","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"567 IAC 61.3(3) Table 1","page":15,"quote":"Acute(p) 16 — 16 16 16 16 — —"}},{"id":"a5b086c5deb2c67c","parameter":"Chromium (VI)","value":"16","value_num":16,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:18540-29-9","place":["US-IA"],"conditions":["receiving_water is freshwater","class B(LW) waters: lakes and wetlands aquatic life"],"cite":{"instrument":"us_ia_wqs","title":"Iowa Administrative Code 567—Chapter 61 Water Quality Standards: Table 1 criteria by use designation, Table 2 dissolved oxygen, pH, Table 4 sulfate, and the livestock-watering ion guidelines kept in effect","issuer":"State of Iowa, Environmental Protection Commission (Department of Natural Resources)","edition":"567 IAC chapter 61, effective February 2, 2022 (IAC 2/9/22), as US EPA posts it in effect for CWA purposes (cover February 13, 2023: 61.3(2)\"g\" kept in effect, EPA having reserved action on its removal; part of 61.3(3)(a)(1) disapproved)","source_url":"https://www.epa.gov/system/files/documents/2024-03/ia-chapter61-2023.pdf","source_sha256":"6d136ce607bf1fc6c839c1cea688892f0a113214bf6026fddab9f18e72d4c0d9","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"567 IAC 61.3(3) Table 1","page":15,"quote":"Acute(p) 16 — 16 16 16 16 — —"}},{"id":"7eed1ba05c1c91a1","parameter":"Chromium 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(Department of Natural Resources)","edition":"567 IAC chapter 61, effective February 2, 2022 (IAC 2/9/22), as US EPA posts it in effect for CWA purposes (cover February 13, 2023: 61.3(2)\"g\" kept in effect, EPA having reserved action on its removal; part of 61.3(3)(a)(1) disapproved)","source_url":"https://www.epa.gov/system/files/documents/2024-03/ia-chapter61-2023.pdf","source_sha256":"6d136ce607bf1fc6c839c1cea688892f0a113214bf6026fddab9f18e72d4c0d9","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"567 IAC 61.3(3) Table 1","page":15,"quote":"MCL — — — — — — 100 —"}},{"id":"a2fa3493dcb86bd1","parameter":"Total chromium","value":"0.10","value_num":0.1,"unit":"Kg/kkg (or pounds per 1,000 lb) of wool","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7440-47-3","place":["US"],"conditions":["route is direct","cites is 40 CFR 410","the discharge is of the Subpart A—Wool Scouring Subcategory","existing sources (BPT)"],"cite":{"instrument":"us_40cfr410","title":"40 CFR Part 410 — PART 410—TEXTILE MILLS POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-10-05","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-10-05/title-40.xml?part=410","source_sha256":"02c53988595c9f2911727f635f59f6a2af0c1d50ce06550c150a706321a505b3","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"40 CFR 410.12 (BPT)","page":null,"quote":"Total chromium 0.10 0.05"}},{"id":"36635e19cc6a833a","parameter":"Total chromium","value":"0.05","value_num":0.05,"unit":"Kg/kkg (or pounds per 1,000 lb) of wool","statistic":"monthly_avg","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7440-47-3","place":["US"],"conditions":["route is direct","cites is 40 CFR 410","the discharge is of the Subpart A—Wool 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