{"query":{"parameter":"oxygen dissolved","place":"US-ND","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-ND","US"],"parameter_keys":["cas:7782-44-7","name:oxygen - dissolved","name:oxygen, dissolved","name:chemical oxygen demand, arsenic, radium (dissolved and total, uranium, zinc","name:diel dissolved oxygen flux","name:dissolved oxygen","name:minimum dissolved oxygen"],"names_matched":[["oxygen dissolved","cas:7782-44-7"],["oxygen dissolved","name:oxygen - dissolved"],["oxygen dissolved","name:oxygen, dissolved"],["chemical oxygen demand arsenic radium dissolved and total uranium zinc","name:chemical oxygen demand, arsenic, radium (dissolved and total, uranium, zinc"],["chemical oxygen demand arsenic radium dissolved and total uranium zinc h","name:chemical oxygen demand, arsenic, radium (dissolved and total, uranium, zinc"],["diel dissolved oxygen flux","name:diel dissolved oxygen flux","dissolved oxygen"],["dissolved oxygen","name:dissolved oxygen","dissolved oxygen"],["minimum dissolved oxygen","name:minimum dissolved oxygen","dissolved oxygen"]],"match":"exact+contains","order":"The place's own instruments first, then each place above it, each in its register's order"},"total":1,"offset":0,"returned":1,"next_offset":null,"rows":[{"id":"fdf3de09fc6d987b","parameter":"Dissolved oxygen","value":"5 mg/l as a daily minimum","value_num":5,"unit":"mg/L","statistic":"instant","direction":"min","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:7782-44-7","place":["US-ND"],"conditions":["receiving_water is freshwater","classes I, IA, II and III streams, and the classified lakes and reservoirs of appendix II","up to 10% of representative samples collected during any 3-year period may be less, provided lethal conditions are avoided; not wetlands and class 4 lakes, nor the hypolimnion of class III and IV lakes during thermal stratification (33.1-16-02.1-09(3)(g))"],"cite":{"instrument":"us_nd_wqs","title":"North Dakota Standards of Quality for Waters of the State (N.D. Admin. Code ch. 33.1-16-02.1): Table 1 maximum limits by stream class and Table 2 water quality criteria","issuer":"State of North Dakota, Department of Environmental Quality","edition":"N.D. Admin. Code ch. 33.1-16-02.1, effective January 1, 2019, amended January 1, 2024, as US EPA posts it in effect for CWA purposes (EPA approved the 2024 amendments March 4, 2024; the chronic mercury criterion 0.012 µg/L stays in effect after EPA's July 15, 2022 disapproval of 0.88 µg/L)","source_url":"https://www.epa.gov/sites/default/files/2015-09/documents/ndwqs.pdf","source_sha256":"c16e38155ad97d62102ffd2e2f78f595a0a6304d3ef6fd214f449cce4819a4b4","fetched_at":"2026-10-14","source_status":{"checked":"2026-10-15","status":"not verified"},"section":"N.D. Admin. Code 33.1-16-02.1-09 Table 1","page":11,"quote":"7782-44-7 Dissolved Oxygen 5 mg/l as a daily minimum (up to 10% of representative samples"}}],"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-ND"},"needs":{"rows":"Your user's measured results, as their table prints them: [{parameter: \"oxygen dissolved\", 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-ND"},"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"}]}