{"permit":"TX0138479","name":"NORTHWEST AIRPORT MANAGEMENT LP","state":"TX","as_of":"2026-10-22","source":{"publisher":"U.S. EPA — ECHO / ICIS-NPDES national file","as_of":"2026-10-22","page":"/dmr/p/TX0138479"},"about":[{"label":"What it is","text":"Airports, Flying Fields, & Services (EPA's industry listing)"},{"label":"Where","text":"Harris County, Texas","href":"https://www.openstreetmap.org/?mlat=30.065555&mlon=-95.55#map=14/30.065555/-95.55"},{"label":"Last 12 months","text":"No values over a limit. 8 required values not reported. 4 of 11 reports filed late"},{"label":"Permit","text":"In force until Oct 31, 2029"}],"renewal_due":null,"renewal_check":null,"sector":{"state":"TX","sic":"45","permits":2,"list":"https://passage-data.com/api/v1/permits?state=TX&sic=45"},"limits_from_version":null,"record":{"last_filed":"2026-08-31","over":0,"over_by":[],"window":["2025-10-01","2026-09-30"]},"over_limits":[],"upcoming":[{"parameter":"Zinc, total [as Zn]","outfall":"003","limit":0.175,"unit":"mg/L","statistic":"daily average","statistic_code":"DB","begin":"2027-11-01","kind":"new","now":null},{"parameter":"Zinc, total [as Zn]","outfall":"003","limit":0.372,"unit":"mg/L","statistic":"daily maximum","statistic_code":"DD","begin":"2027-11-01","kind":"new","now":null}],"limits":[{"outfall":"003","parameter":"Oxygen demand, chem. [high level] [COD]","parameter_code":"00340","statistic":"daily maximum","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"PROCESS WASTEWATER - 003"},{"outfall":"003","parameter":"pH","parameter_code":"00400","statistic":"minimum","qualifier":">=","value":"6","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":"PROCESS WASTEWATER - 003"},{"outfall":"003","parameter":"pH","parameter_code":"00400","statistic":"maximum","qualifier":"<=","value":"9","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":"PROCESS WASTEWATER - 003"},{"outfall":"003","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"daily maximum","qualifier":"<=","value":"100","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"PROCESS WASTEWATER - 003"},{"outfall":"003","parameter":"Oil & Grease","parameter_code":"00556","statistic":"daily maximum","qualifier":"<=","value":"15","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"PROCESS WASTEWATER - 003"},{"outfall":"003","parameter":"Zinc, total [as Zn]","parameter_code":"01092","statistic":"daily maximum","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":"PROCESS WASTEWATER - 003"},{"outfall":"003","parameter":"Flow, in conduit or thru treatment plant","parameter_code":"50050","statistic":"daily average","qualifier":null,"value":null,"unit":"MGD","report_only":true,"enforceable":true,"months":"all","limit_set":"PROCESS WASTEWATER - 003"},{"outfall":"003","parameter":"Flow, in conduit or thru treatment plant","parameter_code":"50050","statistic":"daily maximum","qualifier":null,"value":null,"unit":"MGD","report_only":true,"enforceable":true,"months":"all","limit_set":"PROCESS WASTEWATER - 003"}],"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":"TX","sic":"45"},"needs":{},"get":"https://passage-data.com/api/v1/permits?state=TX&sic=45","url":"https://passage-data.com/api/v1/permits?state=TX&sic=45"},{"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":"TX0138479"},"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=TX0138479"},{"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":"TX0138479"},"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=TX0138479"}]}