{"permit":"MI0027375","name":"Hemlock Semiconductor Operations LLC","state":"MI","as_of":"2026-10-22","source":{"publisher":"U.S. EPA — ECHO / ICIS-NPDES national file","as_of":"2026-10-22","page":"/dmr/p/MI0027375"},"about":[{"label":"What it is","text":"Minerals, Ground Or Treated (EPA's industry listing)"},{"label":"Where","text":"Hemlock, Michigan","href":"https://www.openstreetmap.org/?mlat=43.4323538&mlon=-84.162483#map=14/43.4323538/-84.162483"},{"label":"Last 12 months","text":"Over a limit once, last in June 2026 (Chlorine, total residual)"},{"label":"Permit","text":"In force until Oct 1, 2028"}],"renewal_due":null,"renewal_check":{"offered_because":"application_due_within_18_months","application_due":"2028-04-04","price":"free while piloted","order_page":"https://passage-data.com/dmr/p/MI0027375#renewal","says":"Each limit a renewal could tighten or add, from the state's water-quality standards and the federal rules for this kind of discharge, each cited to its rule, beside EPA's 12-month record; a rule we do not hold is named, never guessed. A person orders it on the permit's page with their email; it is sent by email within 5 business days."},"sector":{"state":"MI","sic":"32","permits":7,"list":"https://passage-data.com/api/v1/permits?state=MI&sic=32","page":"https://passage-data.com/dmr/s/MI/32"},"limits_from_version":null,"record":{"last_filed":"2026-09-30","over":1,"over_by":[["Chlorine, total residual",1]],"window":["2025-10-01","2026-09-30"]},"over_limits":[{"parameter":"Chlorine, total residual","times":1,"find_limits":{"parameter":"chlorine","place":"US-MI","medium":"surface_water"},"get":"https://passage-data.com/api/v1/limits?parameter=chlorine&place=US-MI&medium=surface_water"}],"upcoming":[{"parameter":"Thermal Discharge","outfall":"002","limit":3,"unit":"MBTU/hr","statistic":"monthly average","statistic_code":"MK","begin":"2027-10-01","kind":"new","now":{"median":0.3105,"n":12},"times_limit":0.103}],"limits":[{"outfall":"002","parameter":"Temperature, water deg. 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`get` is the address to fetch.","arguments":{"state":"MI","sic":"32"},"needs":{},"get":"https://passage-data.com/api/v1/permits?state=MI&sic=32","url":"https://passage-data.com/api/v1/permits?state=MI&sic=32","page":"https://passage-data.com/dmr/s/MI/32"},{"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":"chlorine","place":"US-MI","medium":"surface_water"},"needs":{},"get":"https://passage-data.com/api/v1/limits?parameter=chlorine&place=US-MI&medium=surface_water","url":"https://passage-data.com/api/v1/limits?parameter=chlorine&place=US-MI&medium=surface_water","page":"https://passage-data.com/limits/US-MI/chlorine"},{"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":"MI0027375"},"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=MI0027375"},{"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":"MI0027375"},"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=MI0027375"}]}