{"query":{"parameter":"dissolved oxygen","place":"US-WA","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-WA","US"],"parameter_keys":["cas:7782-44-7","name:dissolved oxygen","name:diel dissolved oxygen flux","name:minimum dissolved oxygen","name:chemical oxygen demand, arsenic, radium (dissolved and total, uranium, zinc","name:oxygen - dissolved","name:oxygen, dissolved"],"names_matched":[["dissolved oxygen","cas:7782-44-7"],["dissolved oxygen","name:dissolved oxygen"],["diel dissolved oxygen flux","name:diel dissolved oxygen flux"],["minimum dissolved oxygen","name:minimum dissolved oxygen"],["chemical oxygen demand arsenic radium dissolved and total uranium zinc","name:chemical oxygen demand, arsenic, radium (dissolved and total, uranium, zinc","oxygen dissolved"],["chemical oxygen demand arsenic radium dissolved and total uranium zinc h","name:chemical oxygen demand, arsenic, radium (dissolved and total, uranium, zinc","oxygen dissolved"],["oxygen dissolved","name:oxygen - dissolved","oxygen dissolved"],["oxygen dissolved","name:oxygen, dissolved","oxygen dissolved"],["oxygen dissolved intergravel","name:oxygen, dissolved","oxygen dissolved"]],"match":"exact+contains","order":"The place's own instruments first, then each place above it, each in its register's order"},"total":10,"offset":0,"returned":10,"next_offset":null,"rows":[{"id":"2c4432182f057515","parameter":"Dissolved oxygen","value":"9.5 mg/L","value_num":9.5,"unit":"mg/L","statistic":"instant","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:dissolved oxygen","place":["US-WA"],"conditions":["receiving_water is freshwater","fresh water aquatic life use 'Char Spawning and Rearing' (WAC 173-201A-200(1)(d); use by water body in WAC 173-201A-600 to -602)"],"cite":{"instrument":"us_wa_wqs","title":"Washington WAC 173-201A Water Quality Standards for Surface Waters: Table 240 toxic substances (aquatic life fresh and marine acute/chronic; human health), fresh water dissolved oxygen, marine temperature, dissolved oxygen and pH","issuer":"State of Washington, Department of Ecology","edition":"aquatic life: WAC 173-201A-240(5)(b) Table 240 as US EPA posts it in effect for CWA purposes (effective December 20, 2024; WAC print of 9/12/2023); human health: the WAC page as served 2026-10-14 (WSR 24-24-056, effective 12/28/24), which EPA's posting names as the human health criteria in effect; WAC 173-201A-210 as served 2026-10-14","source_url":"https://www.epa.gov/system/files/documents/2025-03/wa_wqs_0011_122024.pdf","source_sha256":"3d3172a99e8699f8bd484471dbf9dddad02001e806dc0efc15562047ae07c895","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"WAC 173-201A-200(1)(d) (criteria in effect for CWA purposes, EPA's cover)","page":2,"quote":"Table 200(1)(d): The revised Table 200(1)(d) is not currently in effect for CWA purposes. Criteria currently in effect are as follows: Lowest 1-Day Minimum: o  Char Spawning and Rearing: 9.5 mg/L  Core Summer Salmonid Habitat: 9.5 mg/L  Salmonid Spawning, Rearing, and Migration: 8.0 mg/L  Salmonid Rearing and Migration Only: 6.5 mg/L  Non-anadromous Interior Redband Trout: 8.0 mg/L  Indigenous Warm Water Species: 6.5 mg/"}},{"id":"43291166ee9cd9b6","parameter":"Dissolved oxygen","value":"9.5 mg/L","value_num":9.5,"unit":"mg/L","statistic":"instant","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:dissolved oxygen","place":["US-WA"],"conditions":["receiving_water is freshwater","fresh water aquatic life use 'Core Summer Salmonid Habitat' (WAC 173-201A-200(1)(d); use by water body in WAC 173-201A-600 to -602)"],"cite":{"instrument":"us_wa_wqs","title":"Washington WAC 173-201A Water Quality Standards for Surface Waters: Table 240 toxic substances (aquatic life fresh and marine acute/chronic; human health), fresh water dissolved oxygen, marine temperature, dissolved oxygen and pH","issuer":"State of Washington, Department of Ecology","edition":"aquatic life: WAC 173-201A-240(5)(b) Table 240 as US EPA posts it in effect for CWA purposes (effective December 20, 2024; WAC print of 9/12/2023); human health: the WAC page as served 2026-10-14 (WSR 24-24-056, effective 12/28/24), which EPA's posting names as the human health criteria in effect; WAC 173-201A-210 as served 2026-10-14","source_url":"https://www.epa.gov/system/files/documents/2025-03/wa_wqs_0011_122024.pdf","source_sha256":"3d3172a99e8699f8bd484471dbf9dddad02001e806dc0efc15562047ae07c895","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"WAC 173-201A-200(1)(d) (criteria in effect for CWA purposes, EPA's cover)","page":2,"quote":"Table 200(1)(d): The revised Table 200(1)(d) is not currently in effect for CWA purposes. Criteria currently in effect are as follows: Lowest 1-Day Minimum: o  Char Spawning and Rearing: 9.5 mg/L  Core Summer Salmonid Habitat: 9.5 mg/L  Salmonid Spawning, Rearing, and Migration: 8.0 mg/L  Salmonid Rearing and Migration Only: 6.5 mg/L  Non-anadromous Interior Redband Trout: 8.0 mg/L  Indigenous Warm Water Species: 6.5 mg/"}},{"id":"00604cc6329a527d","parameter":"Dissolved oxygen","value":"8.0 mg/L","value_num":8,"unit":"mg/L","statistic":"instant","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:dissolved oxygen","place":["US-WA"],"conditions":["receiving_water is freshwater","fresh water aquatic life use 'Salmonid Spawning, Rearing, and Migration' (WAC 173-201A-200(1)(d); use by water body in WAC 173-201A-600 to -602)"],"cite":{"instrument":"us_wa_wqs","title":"Washington WAC 173-201A Water Quality Standards for Surface Waters: Table 240 toxic substances (aquatic life fresh and marine acute/chronic; human health), fresh water dissolved oxygen, marine temperature, dissolved oxygen and pH","issuer":"State of Washington, Department of Ecology","edition":"aquatic life: WAC 173-201A-240(5)(b) Table 240 as US EPA posts it in effect for CWA purposes (effective December 20, 2024; WAC print of 9/12/2023); human health: the WAC page as served 2026-10-14 (WSR 24-24-056, effective 12/28/24), which EPA's posting names as the human health criteria in effect; WAC 173-201A-210 as served 2026-10-14","source_url":"https://www.epa.gov/system/files/documents/2025-03/wa_wqs_0011_122024.pdf","source_sha256":"3d3172a99e8699f8bd484471dbf9dddad02001e806dc0efc15562047ae07c895","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"WAC 173-201A-200(1)(d) (criteria in effect for CWA purposes, EPA's cover)","page":2,"quote":"Table 200(1)(d): The revised Table 200(1)(d) is not currently in effect for CWA purposes. Criteria currently in effect are as follows: Lowest 1-Day Minimum: o  Char Spawning and Rearing: 9.5 mg/L  Core Summer Salmonid Habitat: 9.5 mg/L  Salmonid Spawning, Rearing, and Migration: 8.0 mg/L  Salmonid Rearing and Migration Only: 6.5 mg/L  Non-anadromous Interior Redband Trout: 8.0 mg/L  Indigenous Warm Water Species: 6.5 mg/"}},{"id":"202ce81c030e1f28","parameter":"Dissolved oxygen","value":"6.5 mg/L","value_num":6.5,"unit":"mg/L","statistic":"instant","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:dissolved oxygen","place":["US-WA"],"conditions":["receiving_water is freshwater","fresh water aquatic life use 'Salmonid Rearing and Migration Only' (WAC 173-201A-200(1)(d); use by water body in WAC 173-201A-600 to -602)"],"cite":{"instrument":"us_wa_wqs","title":"Washington WAC 173-201A Water Quality Standards for Surface Waters: Table 240 toxic substances (aquatic life fresh and marine acute/chronic; human health), fresh water dissolved oxygen, marine temperature, dissolved oxygen and pH","issuer":"State of Washington, Department of Ecology","edition":"aquatic life: WAC 173-201A-240(5)(b) Table 240 as US EPA posts it in effect for CWA purposes (effective December 20, 2024; WAC print of 9/12/2023); human health: the WAC page as served 2026-10-14 (WSR 24-24-056, effective 12/28/24), which EPA's posting names as the human health criteria in effect; WAC 173-201A-210 as served 2026-10-14","source_url":"https://www.epa.gov/system/files/documents/2025-03/wa_wqs_0011_122024.pdf","source_sha256":"3d3172a99e8699f8bd484471dbf9dddad02001e806dc0efc15562047ae07c895","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"WAC 173-201A-200(1)(d) (criteria in effect for CWA purposes, EPA's cover)","page":2,"quote":"Table 200(1)(d): The revised Table 200(1)(d) is not currently in effect for CWA purposes. Criteria currently in effect are as follows: Lowest 1-Day Minimum: o  Char Spawning and Rearing: 9.5 mg/L  Core Summer Salmonid Habitat: 9.5 mg/L  Salmonid Spawning, Rearing, and Migration: 8.0 mg/L  Salmonid Rearing and Migration Only: 6.5 mg/L  Non-anadromous Interior Redband Trout: 8.0 mg/L  Indigenous Warm Water Species: 6.5 mg/"}},{"id":"8c5d50d5279bf09f","parameter":"Dissolved oxygen","value":"8.0 mg/L","value_num":8,"unit":"mg/L","statistic":"instant","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:dissolved oxygen","place":["US-WA"],"conditions":["receiving_water is freshwater","fresh water aquatic life use 'Non-anadromous Interior Redband Trout' (WAC 173-201A-200(1)(d); use by water body in WAC 173-201A-600 to -602)"],"cite":{"instrument":"us_wa_wqs","title":"Washington WAC 173-201A Water Quality Standards for Surface Waters: Table 240 toxic substances (aquatic life fresh and marine acute/chronic; human health), fresh water dissolved oxygen, marine temperature, dissolved oxygen and pH","issuer":"State of Washington, Department of Ecology","edition":"aquatic life: WAC 173-201A-240(5)(b) Table 240 as US EPA posts it in effect for CWA purposes (effective December 20, 2024; WAC print of 9/12/2023); human health: the WAC page as served 2026-10-14 (WSR 24-24-056, effective 12/28/24), which EPA's posting names as the human health criteria in effect; WAC 173-201A-210 as served 2026-10-14","source_url":"https://www.epa.gov/system/files/documents/2025-03/wa_wqs_0011_122024.pdf","source_sha256":"3d3172a99e8699f8bd484471dbf9dddad02001e806dc0efc15562047ae07c895","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"WAC 173-201A-200(1)(d) (criteria in effect for CWA purposes, EPA's cover)","page":2,"quote":"Table 200(1)(d): The revised Table 200(1)(d) is not currently in effect for CWA purposes. Criteria currently in effect are as follows: Lowest 1-Day Minimum: o  Char Spawning and Rearing: 9.5 mg/L  Core Summer Salmonid Habitat: 9.5 mg/L  Salmonid Spawning, Rearing, and Migration: 8.0 mg/L  Salmonid Rearing and Migration Only: 6.5 mg/L  Non-anadromous Interior Redband Trout: 8.0 mg/L  Indigenous Warm Water Species: 6.5 mg/"}},{"id":"63b185eba2d0af43","parameter":"Dissolved oxygen","value":"6.5 mg/L","value_num":6.5,"unit":"mg/L","statistic":"instant","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:dissolved oxygen","place":["US-WA"],"conditions":["receiving_water is freshwater","fresh water aquatic life use 'Indigenous Warm Water Species' (WAC 173-201A-200(1)(d); use by water body in WAC 173-201A-600 to -602)"],"cite":{"instrument":"us_wa_wqs","title":"Washington WAC 173-201A Water Quality Standards for Surface Waters: Table 240 toxic substances (aquatic life fresh and marine acute/chronic; human health), fresh water dissolved oxygen, marine temperature, dissolved oxygen and pH","issuer":"State of Washington, Department of Ecology","edition":"aquatic life: WAC 173-201A-240(5)(b) Table 240 as US EPA posts it in effect for CWA purposes (effective December 20, 2024; WAC print of 9/12/2023); human health: the WAC page as served 2026-10-14 (WSR 24-24-056, effective 12/28/24), which EPA's posting names as the human health criteria in effect; WAC 173-201A-210 as served 2026-10-14","source_url":"https://www.epa.gov/system/files/documents/2025-03/wa_wqs_0011_122024.pdf","source_sha256":"3d3172a99e8699f8bd484471dbf9dddad02001e806dc0efc15562047ae07c895","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"WAC 173-201A-200(1)(d) (criteria in effect for CWA purposes, EPA's cover)","page":2,"quote":"Table 200(1)(d): The revised Table 200(1)(d) is not currently in effect for CWA purposes. 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WAC print of 9/12/2023); human health: the WAC page as served 2026-10-14 (WSR 24-24-056, effective 12/28/24), which EPA's posting names as the human health criteria in effect; WAC 173-201A-210 as served 2026-10-14","source_url":"https://www.epa.gov/system/files/documents/2025-03/wa_wqs_0011_122024.pdf","source_sha256":"3d3172a99e8699f8bd484471dbf9dddad02001e806dc0efc15562047ae07c895","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"WAC 173-201A-210(1)(d) Table 210(1)(d), lowest 1-day minimum","page":null,"quote":"Extraordinary quality 7.0 mg/L"}},{"id":"9215d9ed7c5b73bf","parameter":"Dissolved oxygen","value":"6.0 mg/L","value_num":6,"unit":"mg/L","statistic":"instant","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:dissolved oxygen","place":["US-WA"],"conditions":["receiving_water is marine","marine aquatic life use category 'Excellent quality' (WAC 173-201A-210(1)(a); use by water body in WAC 173-201A-612)"],"cite":{"instrument":"us_wa_wqs","title":"Washington WAC 173-201A Water Quality Standards for Surface Waters: Table 240 toxic substances (aquatic life fresh and marine acute/chronic; human health), fresh water dissolved oxygen, marine temperature, dissolved oxygen and pH","issuer":"State of Washington, Department of Ecology","edition":"aquatic life: WAC 173-201A-240(5)(b) Table 240 as US EPA posts it in effect for CWA purposes (effective December 20, 2024; WAC print of 9/12/2023); human health: the WAC page as served 2026-10-14 (WSR 24-24-056, effective 12/28/24), which EPA's posting names as the human health criteria in effect; WAC 173-201A-210 as served 2026-10-14","source_url":"https://www.epa.gov/system/files/documents/2025-03/wa_wqs_0011_122024.pdf","source_sha256":"3d3172a99e8699f8bd484471dbf9dddad02001e806dc0efc15562047ae07c895","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"WAC 173-201A-210(1)(d) Table 210(1)(d), lowest 1-day minimum","page":null,"quote":"Excellent quality 6.0 mg/L"}},{"id":"a5d28f94f54cb413","parameter":"Dissolved oxygen","value":"5.0 mg/L","value_num":5,"unit":"mg/L","statistic":"instant","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:dissolved oxygen","place":["US-WA"],"conditions":["receiving_water is marine","marine aquatic life use category 'Good quality' (WAC 173-201A-210(1)(a); use by water body in WAC 173-201A-612)"],"cite":{"instrument":"us_wa_wqs","title":"Washington WAC 173-201A Water Quality Standards for Surface Waters: Table 240 toxic substances (aquatic life fresh and marine acute/chronic; human health), fresh water dissolved oxygen, marine temperature, dissolved oxygen and pH","issuer":"State of Washington, Department of Ecology","edition":"aquatic life: WAC 173-201A-240(5)(b) Table 240 as US EPA posts it in effect for CWA purposes (effective December 20, 2024; WAC print of 9/12/2023); human health: the WAC page as served 2026-10-14 (WSR 24-24-056, effective 12/28/24), which EPA's posting names as the human health criteria in effect; WAC 173-201A-210 as served 2026-10-14","source_url":"https://www.epa.gov/system/files/documents/2025-03/wa_wqs_0011_122024.pdf","source_sha256":"3d3172a99e8699f8bd484471dbf9dddad02001e806dc0efc15562047ae07c895","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"WAC 173-201A-210(1)(d) Table 210(1)(d), lowest 1-day minimum","page":null,"quote":"Good quality 5.0 mg/L"}},{"id":"8c3766f8e57c8b21","parameter":"Dissolved oxygen","value":"4.0 mg/L","value_num":4,"unit":"mg/L","statistic":"instant","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:dissolved oxygen","place":["US-WA"],"conditions":["receiving_water is marine","marine aquatic life use category 'Fair quality' (WAC 173-201A-210(1)(a); use by water body in WAC 173-201A-612)"],"cite":{"instrument":"us_wa_wqs","title":"Washington WAC 173-201A Water Quality Standards for Surface Waters: Table 240 toxic substances (aquatic life fresh and marine acute/chronic; human health), fresh water dissolved oxygen, marine temperature, dissolved oxygen and pH","issuer":"State of Washington, Department of Ecology","edition":"aquatic life: WAC 173-201A-240(5)(b) Table 240 as US EPA posts it in effect for CWA purposes (effective December 20, 2024; WAC print of 9/12/2023); human health: the WAC page as served 2026-10-14 (WSR 24-24-056, effective 12/28/24), which EPA's posting names as the human health criteria in effect; WAC 173-201A-210 as served 2026-10-14","source_url":"https://www.epa.gov/system/files/documents/2025-03/wa_wqs_0011_122024.pdf","source_sha256":"3d3172a99e8699f8bd484471dbf9dddad02001e806dc0efc15562047ae07c895","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"WAC 173-201A-210(1)(d) Table 210(1)(d), lowest 1-day minimum","page":null,"quote":"Fair quality 4.0 mg/L"}}],"next":[{"tool":"check_values","says":"Has your user measured this? check_values sets each of their results beside every row held here, with a verdict and the row's cite.","arguments":{"place":"US-WA"},"needs":{"rows":"Your user's measured results, as their table prints them: [{parameter: \"dissolved oxygen\", value, unit}, ...], any other parameters too."},"post":"/api/v1/check"},{"tool":"read_certificate","says":"Has your user a laboratory certificate? read_certificate reads every row it prints, each with its page, and checks them against these limits.","arguments":{"place":"US-WA"},"needs":{"content_base64":"The laboratory's certificate (PDF) or its XLSX, XLS or CSV export, as base64; 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