{"query":{"parameter":"dissolved oxygen","place":"US-MA","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-MA","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":"a7ab67c8e23017cc","parameter":"Dissolved oxygen","value":"not less than 6.0 mg/L (cold water fisheries)","value_num":6,"unit":"mg/L","statistic":"instant","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:dissolved oxygen","place":["US-MA"],"conditions":["receiving_water is freshwater","Class A, cold water fisheries waters (314 CMR 4.05)"],"cite":{"instrument":"us_ma_wqs","title":"314 CMR 4.00 Massachusetts Surface Water Quality Standards: Table 29 generally applicable criteria (29a aquatic life, 29b human health) and 4.05 class dissolved oxygen and pH","issuer":"Commonwealth of Massachusetts, Department of Environmental Protection","edition":"314 CMR 4.00 effective May 1, 2023 (Table 29 as revised 11/12/21), as US EPA posts it in effect for Clean Water Act purposes (EPA has taken no action on Table 29a's diazinon revision)","source_url":"https://www.epa.gov/system/files/documents/2023-06/mawqs-2023.pdf","source_sha256":"fbd41bea9b0ac291b23023ff580ca4349b2b3a6269225bd3218a56037aca1309","fetched_at":"2026-10-10","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"314 CMR 4.05(3)","page":12,"quote":"1. Dissolved Oxygen. Shall not be less than 6.0 mg/L in cold water fisheries and not less than 5.0 mg/L in warm water fisheries."}},{"id":"908b9c939c74057b","parameter":"Dissolved oxygen","value":"not less than 5.0 mg/L (warm water fisheries)","value_num":5,"unit":"mg/L","statistic":"instant","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:dissolved oxygen","place":["US-MA"],"conditions":["receiving_water is freshwater","Class A, warm water fisheries waters (314 CMR 4.05)"],"cite":{"instrument":"us_ma_wqs","title":"314 CMR 4.00 Massachusetts Surface Water Quality Standards: Table 29 generally applicable criteria (29a aquatic life, 29b human health) and 4.05 class dissolved oxygen and pH","issuer":"Commonwealth of Massachusetts, Department of Environmental Protection","edition":"314 CMR 4.00 effective May 1, 2023 (Table 29 as revised 11/12/21), as US EPA posts it in effect for Clean Water Act purposes (EPA has taken no action on Table 29a's diazinon revision)","source_url":"https://www.epa.gov/system/files/documents/2023-06/mawqs-2023.pdf","source_sha256":"fbd41bea9b0ac291b23023ff580ca4349b2b3a6269225bd3218a56037aca1309","fetched_at":"2026-10-10","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"314 CMR 4.05(3)","page":12,"quote":"1. Dissolved Oxygen. Shall not be less than 6.0 mg/L in cold water fisheries and not less than 5.0 mg/L in warm water fisheries."}},{"id":"474f7c934fbc05dc","parameter":"Dissolved oxygen","value":"not less than 6.0 mg/L (cold water fisheries)","value_num":6,"unit":"mg/L","statistic":"instant","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:dissolved oxygen","place":["US-MA"],"conditions":["receiving_water is freshwater","Class B, cold water fisheries waters (314 CMR 4.05)"],"cite":{"instrument":"us_ma_wqs","title":"314 CMR 4.00 Massachusetts Surface Water Quality Standards: Table 29 generally applicable criteria (29a aquatic life, 29b human health) and 4.05 class dissolved oxygen and pH","issuer":"Commonwealth of Massachusetts, Department of Environmental Protection","edition":"314 CMR 4.00 effective May 1, 2023 (Table 29 as revised 11/12/21), as US EPA posts it in effect for Clean Water Act purposes (EPA has taken no action on Table 29a's diazinon revision)","source_url":"https://www.epa.gov/system/files/documents/2023-06/mawqs-2023.pdf","source_sha256":"fbd41bea9b0ac291b23023ff580ca4349b2b3a6269225bd3218a56037aca1309","fetched_at":"2026-10-10","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"314 CMR 4.05(3)","page":13,"quote":"1. Dissolved Oxygen. Shall not be less than 6.0 mg/L in cold water fisheries and not less than 5.0 mg/L in warm water fisheries."}},{"id":"0b98c7e5e9e9bc9e","parameter":"Dissolved oxygen","value":"not less than 5.0 mg/L (warm water fisheries)","value_num":5,"unit":"mg/L","statistic":"instant","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:dissolved oxygen","place":["US-MA"],"conditions":["receiving_water is freshwater","Class B, warm water fisheries waters (314 CMR 4.05)"],"cite":{"instrument":"us_ma_wqs","title":"314 CMR 4.00 Massachusetts Surface Water Quality Standards: Table 29 generally applicable criteria (29a aquatic life, 29b human health) and 4.05 class dissolved oxygen and pH","issuer":"Commonwealth of Massachusetts, Department of Environmental Protection","edition":"314 CMR 4.00 effective May 1, 2023 (Table 29 as revised 11/12/21), as US EPA posts it in effect for Clean Water Act purposes (EPA has taken no action on Table 29a's diazinon revision)","source_url":"https://www.epa.gov/system/files/documents/2023-06/mawqs-2023.pdf","source_sha256":"fbd41bea9b0ac291b23023ff580ca4349b2b3a6269225bd3218a56037aca1309","fetched_at":"2026-10-10","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"314 CMR 4.05(3)","page":13,"quote":"1. Dissolved Oxygen. Shall not be less than 6.0 mg/L in cold water fisheries and not less than 5.0 mg/L in warm water fisheries."}},{"id":"39019a71634a5f39","parameter":"Dissolved oxygen","value":"not less than 5.0 mg/L at least 16 hours of any 24-hour period","value_num":5,"unit":"mg/L","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:dissolved oxygen","place":["US-MA"],"conditions":["receiving_water is freshwater","Class C waters (314 CMR 4.05)"],"cite":{"instrument":"us_ma_wqs","title":"314 CMR 4.00 Massachusetts Surface Water Quality Standards: Table 29 generally applicable criteria (29a aquatic life, 29b human health) and 4.05 class dissolved oxygen and pH","issuer":"Commonwealth of Massachusetts, Department of Environmental Protection","edition":"314 CMR 4.00 effective May 1, 2023 (Table 29 as revised 11/12/21), as US EPA posts it in effect for Clean Water Act purposes (EPA has taken no action on Table 29a's diazinon revision)","source_url":"https://www.epa.gov/system/files/documents/2023-06/mawqs-2023.pdf","source_sha256":"fbd41bea9b0ac291b23023ff580ca4349b2b3a6269225bd3218a56037aca1309","fetched_at":"2026-10-10","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"314 CMR 4.05(3)","page":14,"quote":"1. Dissolved Oxygen. Shall not be less than 5.0 mg/L at least 16 hours of any 24-hour period and not less than 3.0 mg/L at any time."}},{"id":"048dac181e447326","parameter":"Dissolved oxygen","value":"not less than 3.0 mg/L at any time","value_num":3,"unit":"mg/L","statistic":"instant","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:dissolved oxygen","place":["US-MA"],"conditions":["receiving_water is freshwater","Class C waters (314 CMR 4.05)"],"cite":{"instrument":"us_ma_wqs","title":"314 CMR 4.00 Massachusetts Surface Water Quality Standards: Table 29 generally applicable criteria (29a aquatic life, 29b human health) and 4.05 class dissolved oxygen and pH","issuer":"Commonwealth of Massachusetts, Department of Environmental Protection","edition":"314 CMR 4.00 effective May 1, 2023 (Table 29 as revised 11/12/21), as US EPA posts it in effect for Clean Water Act purposes (EPA has taken no action on Table 29a's diazinon revision)","source_url":"https://www.epa.gov/system/files/documents/2023-06/mawqs-2023.pdf","source_sha256":"fbd41bea9b0ac291b23023ff580ca4349b2b3a6269225bd3218a56037aca1309","fetched_at":"2026-10-10","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"314 CMR 4.05(3)","page":14,"quote":"1. Dissolved Oxygen. Shall not be less than 5.0 mg/L at least 16 hours of any 24-hour period and not less than 3.0 mg/L at any time."}},{"id":"751f9f0d1cb1c525","parameter":"Dissolved oxygen","value":"not less than 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-MA"],"conditions":["receiving_water is marine","Class SA waters (314 CMR 4.05)"],"cite":{"instrument":"us_ma_wqs","title":"314 CMR 4.00 Massachusetts Surface Water Quality Standards: Table 29 generally applicable criteria (29a aquatic life, 29b human health) and 4.05 class dissolved oxygen and pH","issuer":"Commonwealth of Massachusetts, Department of Environmental Protection","edition":"314 CMR 4.00 effective May 1, 2023 (Table 29 as revised 11/12/21), as US EPA posts it in effect for Clean Water Act purposes (EPA has taken no action on Table 29a's diazinon revision)","source_url":"https://www.epa.gov/system/files/documents/2023-06/mawqs-2023.pdf","source_sha256":"fbd41bea9b0ac291b23023ff580ca4349b2b3a6269225bd3218a56037aca1309","fetched_at":"2026-10-10","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"314 CMR 4.05(4)","page":15,"quote":"1. Dissolved Oxygen. Shall not be less than 6.0 mg/L."}},{"id":"82f1036924d45a3f","parameter":"Dissolved oxygen","value":"not less than 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-MA"],"conditions":["receiving_water is marine","Class SB waters (314 CMR 4.05)"],"cite":{"instrument":"us_ma_wqs","title":"314 CMR 4.00 Massachusetts Surface Water Quality Standards: Table 29 generally applicable criteria (29a aquatic life, 29b human health) and 4.05 class dissolved oxygen and pH","issuer":"Commonwealth of Massachusetts, Department of Environmental Protection","edition":"314 CMR 4.00 effective May 1, 2023 (Table 29 as revised 11/12/21), as US EPA posts it in effect for Clean Water Act purposes (EPA has taken no action on Table 29a's diazinon revision)","source_url":"https://www.epa.gov/system/files/documents/2023-06/mawqs-2023.pdf","source_sha256":"fbd41bea9b0ac291b23023ff580ca4349b2b3a6269225bd3218a56037aca1309","fetched_at":"2026-10-10","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"314 CMR 4.05(4)","page":16,"quote":"1. Dissolved Oxygen. Shall not be less than 5.0 mg/L."}},{"id":"5049b77d66efbdd2","parameter":"Dissolved oxygen","value":"not less than 5.0 mg/L at least 16 hours of any 24-hour period","value_num":5,"unit":"mg/L","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:dissolved oxygen","place":["US-MA"],"conditions":["receiving_water is marine","Class SC waters (314 CMR 4.05)"],"cite":{"instrument":"us_ma_wqs","title":"314 CMR 4.00 Massachusetts Surface Water Quality Standards: Table 29 generally applicable criteria (29a aquatic life, 29b human health) and 4.05 class dissolved oxygen and pH","issuer":"Commonwealth of Massachusetts, Department of Environmental Protection","edition":"314 CMR 4.00 effective May 1, 2023 (Table 29 as revised 11/12/21), as US EPA posts it in effect for Clean Water Act purposes (EPA has taken no action on Table 29a's diazinon revision)","source_url":"https://www.epa.gov/system/files/documents/2023-06/mawqs-2023.pdf","source_sha256":"fbd41bea9b0ac291b23023ff580ca4349b2b3a6269225bd3218a56037aca1309","fetched_at":"2026-10-10","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"314 CMR 4.05(4)","page":17,"quote":"1. Dissolved Oxygen. Shall not be less than 5.0 mg/L at least 16 hours of any 24-hour period and not less than 4.0 mg/L at any time."}},{"id":"ea2241508c377496","parameter":"Dissolved oxygen","value":"not less than 4.0 mg/L at any time","value_num":4,"unit":"mg/L","statistic":"instant","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"name:dissolved oxygen","place":["US-MA"],"conditions":["receiving_water is marine","Class SC waters (314 CMR 4.05)"],"cite":{"instrument":"us_ma_wqs","title":"314 CMR 4.00 Massachusetts Surface Water Quality Standards: Table 29 generally applicable criteria (29a aquatic life, 29b human health) and 4.05 class dissolved oxygen and pH","issuer":"Commonwealth of Massachusetts, Department of Environmental Protection","edition":"314 CMR 4.00 effective May 1, 2023 (Table 29 as revised 11/12/21), as US EPA posts it in effect for Clean Water Act purposes (EPA has taken no action on Table 29a's diazinon revision)","source_url":"https://www.epa.gov/system/files/documents/2023-06/mawqs-2023.pdf","source_sha256":"fbd41bea9b0ac291b23023ff580ca4349b2b3a6269225bd3218a56037aca1309","fetched_at":"2026-10-10","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"314 CMR 4.05(4)","page":17,"quote":"1. Dissolved Oxygen. Shall not be less than 5.0 mg/L at least 16 hours of any 24-hour period and not less than 4.0 mg/L at any time."}}],"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-MA"},"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-MA"},"needs":{"content_base64":"The laboratory's certificate (PDF) or its XLSX, XLS or CSV export, as base64; or file_url, a public https address of it."},"post":"/api/v1/certificate"}]}