{"permit":"IN0059021","name":"STEEL DYNAMICS, INC. - FLAT ROLL GROUP, BUTLER DIVISION","state":"IN","as_of":"2026-10-22","source":{"publisher":"U.S. EPA — ECHO / ICIS-NPDES national file","as_of":"2026-10-22","page":"/dmr/p/IN0059021"},"about":[{"label":"What it is","text":"Blast Furnaces And Steel Mills (EPA's industry listing)"},{"label":"Where","text":"Butler, Indiana","href":"https://www.openstreetmap.org/?mlat=41.366611&mlon=-84.92425#map=14/41.366611/-84.92425"},{"label":"Last 12 months","text":"Over a limit 10 times, last in August 2026 (Toxicity [chronic], Ceriodaphnia dubia; pH; Zinc, total recoverable)"},{"label":"Permit","text":"In force until Dec 31, 2029"}],"renewal_due":null,"renewal_check":null,"sector":{"state":"IN","sic":"33","permits":54,"list":"https://passage-data.com/api/v1/permits?state=IN&sic=33","page":"https://passage-data.com/dmr/s/IN/33"},"limits_from_version":null,"record":{"last_filed":"2026-08-31","over":10,"over_by":[["Toxicity [chronic], Ceriodaphnia dubia",4],["pH",4],["Zinc, total recoverable",2]],"window":["2025-10-01","2026-09-30"]},"over_limits":[{"parameter":"pH","times":4,"find_limits":{"parameter":"ph","place":"US-IN","medium":"surface_water"},"get":"https://passage-data.com/api/v1/limits?parameter=ph&place=US-IN&medium=surface_water"},{"parameter":"Zinc, total recoverable","times":2,"find_limits":{"parameter":"zinc","place":"US-IN","medium":"surface_water"},"get":"https://passage-data.com/api/v1/limits?parameter=zinc&place=US-IN&medium=surface_water"}],"limits":[{"outfall":"002","parameter":"pH","parameter_code":"00400","statistic":"daily minimum","qualifier":">=","value":"6","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":"SW DETENTION POND: GEOTHERMAL, COOLING, NONCONTACT SCRAP METAL, HOT MILL/MELT SHOP, ETC. 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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":"ph","place":"US-IN","medium":"surface_water"},"needs":{},"get":"https://passage-data.com/api/v1/limits?parameter=ph&place=US-IN&medium=surface_water","url":"https://passage-data.com/api/v1/limits?parameter=ph&place=US-IN&medium=surface_water","page":"https://passage-data.com/limits/US-IN/ph"},{"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":"IN0059021"},"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=IN0059021"},{"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":"IN0059021"},"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=IN0059021"}]}