{"permit":"MI0044491","name":"Great Lakes Aggregate-Sylvania","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/MI0044491"},"about":[{"label":"What it is","text":"Construction Sand And Gravel (EPA's industry listing) · rated a major discharger by EPA"},{"label":"Where","text":"South Rockwood, Michigan","href":"https://www.openstreetmap.org/?mlat=42.055833&mlon=-83.273055#map=14/42.055833/-83.273055"},{"label":"Last 12 months","text":"Over a limit 16 times, last in September 2026 (Hydrogen peroxide; Hydrogen sulfide; pH). 110 required values not reported"},{"label":"Permit","text":"Expired Oct 1, 2018; its limits still apply until a new permit is issued, and EPA still expects the reports"}],"renewal_due":null,"renewal_check":{"offered_because":"permit_expired","application_due":"2018-04-04","price":"free while piloted","order_page":"https://passage-data.com/dmr/p/MI0044491#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":"14","permits":17,"list":"https://passage-data.com/api/v1/permits?state=MI&sic=14","page":"https://passage-data.com/dmr/s/MI/14"},"limits_from_version":null,"record":{"last_filed":"2026-09-30","over":16,"over_by":[["Hydrogen peroxide",12],["Hydrogen sulfide",3],["pH",1]],"window":["2025-10-01","2026-09-30"]},"over_limits":[{"parameter":"Hydrogen sulfide","times":3,"find_limits":{"parameter":"hydrogen sulfide","place":"US-MI","medium":"surface_water"},"get":"https://passage-data.com/api/v1/limits?parameter=hydrogen+sulfide&place=US-MI&medium=surface_water"},{"parameter":"pH","times":1,"find_limits":{"parameter":"ph","place":"US-MI","medium":"surface_water"},"get":"https://passage-data.com/api/v1/limits?parameter=ph&place=US-MI&medium=surface_water"}],"limits":[{"outfall":"002","parameter":"Temperature, water deg. 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maximum","qualifier":null,"value":null,"unit":"tox chronic","report_only":true,"enforceable":true,"months":"all","limit_set":"002A"}],"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":"MI","sic":"14"},"needs":{},"get":"https://passage-data.com/api/v1/permits?state=MI&sic=14","url":"https://passage-data.com/api/v1/permits?state=MI&sic=14","page":"https://passage-data.com/dmr/s/MI/14"},{"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":"hydrogen sulfide","place":"US-MI","medium":"surface_water"},"needs":{},"get":"https://passage-data.com/api/v1/limits?parameter=hydrogen+sulfide&place=US-MI&medium=surface_water","url":"https://passage-data.com/api/v1/limits?parameter=hydrogen+sulfide&place=US-MI&medium=surface_water","page":"https://passage-data.com/limits/US-MI/hydrogen-sulfide"},{"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":"MI0044491"},"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=MI0044491"},{"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":"MI0044491"},"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=MI0044491"}]}