{"permit":"MN0004421","name":"MDNR","state":"MN","as_of":"2026-10-22","source":{"publisher":"U.S. EPA — ECHO / ICIS-NPDES national file","as_of":"2026-10-22","page":"/dmr/p/MN0004421"},"about":[{"label":"What it is","text":"Fish Hatcheries And Preserves (EPA's industry listing)"},{"label":"Where","text":"Altura, Minnesota","href":"https://www.openstreetmap.org/?mlat=44.0747039&mlon=-91.9862154#map=14/44.0747039/-91.9862154"},{"label":"Last 12 months","text":"Over a limit 4 times, last in August 2026 (BOD, carbonaceous [5 day, 20 C])"},{"label":"Permit","text":"In force until Jan 31, 2030"}],"renewal_due":null,"renewal_check":null,"sector":{"state":"MN","sic":"09","permits":4,"list":"https://passage-data.com/api/v1/permits?state=MN&sic=09","page":"https://passage-data.com/dmr/s/MN/09"},"limits_from_version":null,"record":{"last_filed":"2026-08-31","over":4,"over_by":[["BOD, carbonaceous [5 day, 20 C]",4]],"window":["2025-10-01","2026-09-30"]},"over_limits":[{"parameter":"BOD, carbonaceous [5 day, 20 C]","times":4,"find_limits":{"parameter":"cbod5","place":"US-MN","medium":"water_discharge"},"get":"https://passage-data.com/api/v1/limits?parameter=cbod5&place=US-MN&medium=water_discharge"}],"limits":[{"outfall":"D004","parameter":"Temperature, water deg. centigrade","parameter_code":"00010","statistic":"monthly average","qualifier":null,"value":null,"unit":"deg C","report_only":true,"enforceable":true,"months":"all","limit_set":null},{"outfall":"D004","parameter":"Temperature, water deg. centigrade","parameter_code":"00010","statistic":"daily maximum","qualifier":null,"value":null,"unit":"deg C","report_only":true,"enforceable":true,"months":"all","limit_set":null},{"outfall":"D004","parameter":"pH","parameter_code":"00400","statistic":"instantaneous minimum","qualifier":">=","value":"6.5","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":null},{"outfall":"D004","parameter":"pH","parameter_code":"00400","statistic":"instantaneous 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maximum","qualifier":null,"value":null,"unit":"MGD","report_only":true,"enforceable":true,"months":"all","limit_set":null},{"outfall":"D004","parameter":"Flow, in conduit or thru treatment plant","parameter_code":"50050","statistic":"monthly total","qualifier":null,"value":null,"unit":"Mgal/mo","report_only":true,"enforceable":true,"months":"all","limit_set":null},{"outfall":"D004","parameter":"BOD, carbonaceous [5 day, 20 C]","parameter_code":"80082","statistic":"monthly average","qualifier":"<=","value":"25","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":null},{"outfall":"D004","parameter":"BOD, carbonaceous [5 day, 20 C]","parameter_code":"80082","statistic":"daily maximum","qualifier":"<=","value":"50","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":null},{"outfall":"D004","parameter":"BOD, carbonaceous [5 day, 20 C]","parameter_code":"80082","statistic":"monthly average","qualifier":"<=","value":"255","unit":"kg/d","report_only":false,"enforceable":true,"months":"all","limit_set":null},{"outfall":"D004","parameter":"BOD, carbonaceous [5 day, 20 C]","parameter_code":"80082","statistic":"daily maximum","qualifier":"<=","value":"605","unit":"kg/d","report_only":false,"enforceable":true,"months":"all","limit_set":null}],"next":[{"tool":"list_permits","says":"Screening this industry? list_permits lists every permit of it in this state in one call, each with its page and its get_permit address; `get` is the address to fetch.","arguments":{"state":"MN","sic":"09"},"needs":{},"get":"https://passage-data.com/api/v1/permits?state=MN&sic=09","url":"https://passage-data.com/api/v1/permits?state=MN&sic=09","page":"https://passage-data.com/dmr/s/MN/09"},{"tool":"find_limits","says":"What do the rules say about what it went over on? find_limits gives the cited state and federal limits for it, each with its rule; `get` is the address to fetch, and `over_limits` holds one for each parameter.","arguments":{"parameter":"cbod5","place":"US-MN","medium":"water_discharge"},"needs":{},"get":"https://passage-data.com/api/v1/limits?parameter=cbod5&place=US-MN&medium=water_discharge","url":"https://passage-data.com/api/v1/limits?parameter=cbod5&place=US-MN&medium=water_discharge","page":"https://passage-data.com/limits/US-MN/cbod5"},{"tool":"check_dmr","says":"Before your user files this permit's DMR: check_dmr sets each value beside the permit's limit for that period, with EPA's violation rule's verdict.","arguments":{"permit":"MN0004421"},"needs":{"period_end":"The reporting period: its month (2026-09).","values":"The period's values as your user will file them: [{outfall, parameter, statistic, value, unit}, ...]."},"post":"/api/v1/dmr/check","url":"https://passage-data.com/api/v1/dmr/check","page":"https://passage-data.com/dmr/?permit=MN0004421"},{"tool":"fill_dmr","says":"Has your user the plant's raw daily results? fill_dmr computes the period's DMR values from them, each with the rows it came from.","arguments":{"permit":"MN0004421"},"needs":{"period_end":"The reporting period: its month (2026-09).","rows":"The plant's results: [{date, parameter, value, unit, point}, ...]; or `table`, the lab's or plant's export as text."},"post":"/api/v1/dmr/fill","url":"https://passage-data.com/api/v1/dmr/fill","page":"https://passage-data.com/dmr/?permit=MN0004421"}]}