{"permit":"MA0004928","name":"GENON HOLDCO 10, LLC","state":"MA","as_of":"2026-10-22","source":{"publisher":"U.S. EPA — ECHO / ICIS-NPDES national file","as_of":"2026-10-22","page":"/dmr/p/MA0004928"},"about":[{"label":"What it is","text":"Electric Services (EPA's industry listing) · rated a major discharger by EPA"},{"label":"Where","text":"Sandwich, Massachusetts","href":"https://www.openstreetmap.org/?mlat=41.770556&mlon=-70.509722#map=14/41.770556/-70.509722"},{"label":"Last 12 months","text":"Over a limit once, last in June 2026 (Temperature, water deg. fahrenheit)"},{"label":"Permit","text":"Expired Jun 23, 1994; 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":"1993-12-25","price":"free while piloted","order_page":"https://passage-data.com/dmr/p/MA0004928#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":"MA","sic":"4911","permits":6,"list":"https://passage-data.com/api/v1/permits?state=MA&sic=4911","page":"https://passage-data.com/dmr/s/MA/4911"},"limits_from_version":null,"record":{"last_filed":"2026-09-30","over":1,"over_by":[["Temperature, water deg. fahrenheit",1]],"window":["2025-10-01","2026-09-30"]},"over_limits":[],"limits":[{"outfall":"001","parameter":"Temperature, water deg. fahrenheit","parameter_code":"00011","statistic":"daily maximum","qualifier":"<=","value":"86","unit":"deg F","report_only":false,"enforceable":true,"months":"all","limit_set":"001 A  CONDENSER COOLING WATER"},{"outfall":"001","parameter":"pH","parameter_code":"00400","statistic":"minimum","qualifier":">=","value":"6.5","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":"001 A  CONDENSER COOLING WATER"},{"outfall":"001","parameter":"pH","parameter_code":"00400","statistic":"maximum","qualifier":"<=","value":"8.5","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":"001 A  CONDENSER COOLING WATER"},{"outfall":"001","parameter":"Flow, in conduit or thru treatment plant","parameter_code":"50050","statistic":"daily maximum","qualifier":"<=","value":"518","unit":"MGD","report_only":false,"enforceable":true,"months":"all","limit_set":"001 A  CONDENSER COOLING WATER"},{"outfall":"001","parameter":"Chlorine, total residual","parameter_code":"50060","statistic":"daily maximum","qualifier":"<=","value":".1","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"001 A  CONDENSER COOLING WATER"},{"outfall":"002","parameter":"Temperature, water deg. fahrenheit","parameter_code":"00011","statistic":"daily maximum","qualifier":"<=","value":"90","unit":"deg F","report_only":false,"enforceable":true,"months":"all","limit_set":"002A INT. SCREEN, FLUME FLUSH"},{"outfall":"002","parameter":"pH","parameter_code":"00400","statistic":"minimum","qualifier":">=","value":"6.5","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":"002A INT. SCREEN, FLUME FLUSH"},{"outfall":"002","parameter":"pH","parameter_code":"00400","statistic":"maximum","qualifier":"<=","value":"8.5","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":"002A INT. SCREEN, FLUME FLUSH"},{"outfall":"002","parameter":"Flow, in conduit or thru treatment plant","parameter_code":"50050","statistic":"monthly average","qualifier":"<=","value":"2.5","unit":"MGD","report_only":false,"enforceable":true,"months":"all","limit_set":"002A INT. SCREEN, FLUME FLUSH"},{"outfall":"002","parameter":"Flow, in conduit or thru treatment plant","parameter_code":"50050","statistic":"daily maximum","qualifier":"<=","value":"4.4","unit":"MGD","report_only":false,"enforceable":true,"months":"all","limit_set":"002A INT. SCREEN, FLUME FLUSH"},{"outfall":"010","parameter":"pH","parameter_code":"00400","statistic":"minimum","qualifier":">=","value":"6.5","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":"010 A  UNIT #1 FLOOR DRAINS"},{"outfall":"010","parameter":"pH","parameter_code":"00400","statistic":"maximum","qualifier":"<=","value":"8.5","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":"010 A  UNIT #1 FLOOR DRAINS"},{"outfall":"010","parameter":"Oil & Grease","parameter_code":"00556","statistic":"monthly average","qualifier":"<=","value":"10","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"010 A  UNIT #1 FLOOR DRAINS"},{"outfall":"010","parameter":"Oil & Grease","parameter_code":"00556","statistic":"daily maximum","qualifier":"<=","value":"15","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"010 A  UNIT #1 FLOOR DRAINS"},{"outfall":"010","parameter":"Flow, in conduit or thru 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Cu]","parameter_code":"01042","statistic":"monthly average","qualifier":"<=","value":"1","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"011 A  WASTE SYSTEM BLOWDOWN"},{"outfall":"011","parameter":"Copper, total [as Cu]","parameter_code":"01042","statistic":"daily maximum","qualifier":"<=","value":"1","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"011 A  WASTE SYSTEM BLOWDOWN"},{"outfall":"011","parameter":"Iron, total [as Fe]","parameter_code":"01045","statistic":"monthly average","qualifier":"<=","value":"1","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"011 A  WASTE SYSTEM BLOWDOWN"},{"outfall":"011","parameter":"Iron, total [as Fe]","parameter_code":"01045","statistic":"daily maximum","qualifier":"<=","value":"1","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"011 A  WASTE SYSTEM BLOWDOWN"},{"outfall":"011","parameter":"Flow, in conduit or thru 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(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=MA0004928"},{"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":"MA0004928"},"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=MA0004928"}]}