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Ask for one by its name or CAS number."}},"total":18,"offset":0,"returned":18,"next_offset":null,"rows":[{"id":"0ab07e1f6ecd0b89","parameter":"Chloropyrifos","value":".041","value_num":0.041,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:2921-88-2","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":"not verified"},"section":"567 IAC 61.3(3) Table 1","page":15,"quote":"Chloropyrifos Chronic .041 — .041 .041 .041 .041 — —"}},{"id":"36c7a8e9586cdb07","parameter":"Chloropyrifos","value":".041","value_num":0.041,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:2921-88-2","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; 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