{"permit":"IA0003182","name":"CITY OF CHARLES CITY","state":"IA","as_of":"2026-10-22","source":{"publisher":"U.S. EPA — ECHO / ICIS-NPDES national file","as_of":"2026-10-22","page":"/dmr/p/IA0003182"},"about":[{"label":"What it is","text":"Water Supply (EPA's industry listing)"},{"label":"Where","text":"Charles City, Iowa","href":"https://www.openstreetmap.org/?mlat=43.06928&mlon=-92.67425#map=14/43.06928/-92.67425"},{"label":"Last 12 months","text":"Over a limit once, last in December 2025 (Iron, total [as Fe]). 8 required values not reported"},{"label":"Permit","text":"In force until Jan 31, 2029"}],"renewal_due":null,"renewal_check":null,"sector":{"state":"IA","sic":"4941","permits":48,"list":"https://passage-data.com/api/v1/permits?state=IA&sic=4941","page":"https://passage-data.com/dmr/s/IA/4941"},"limits_from_version":null,"record":{"last_filed":"2026-08-31","over":1,"over_by":[["Iron, total [as Fe]",1]],"window":["2025-10-01","2026-09-30"]},"over_limits":[{"parameter":"Iron, total [as Fe]","times":1,"find_limits":{"parameter":"iron","place":"US-IA","medium":"surface_water"},"get":"https://passage-data.com/api/v1/limits?parameter=iron&place=US-IA&medium=surface_water"}],"limits":[{"outfall":"001","parameter":"pH","parameter_code":"00400","statistic":"daily minimum","qualifier":">=","value":"6.5","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":"MONTHLY"},{"outfall":"001","parameter":"pH","parameter_code":"00400","statistic":"daily maximum","qualifier":"<=","value":"9","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":"MONTHLY"},{"outfall":"001","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"30-day average","qualifier":"<=","value":"30","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"MONTHLY"},{"outfall":"001","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"daily maximum","qualifier":"<=","value":"45","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"MONTHLY"},{"outfall":"001","parameter":"Iron, total [as Fe]","parameter_code":"01045","statistic":"30-day average","qualifier":"<=","value":"1.03","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"MONTHLY"},{"outfall":"001","parameter":"Iron, total [as Fe]","parameter_code":"01045","statistic":"daily maximum","qualifier":"<=","value":"1.03","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":"MONTHLY"},{"outfall":"001","parameter":"Iron, total [as Fe]","parameter_code":"01045","statistic":"30-day average","qualifier":"<=","value":".914","unit":"lb/d","report_only":false,"enforceable":true,"months":"all","limit_set":"MONTHLY"},{"outfall":"001","parameter":"Iron, total [as Fe]","parameter_code":"01045","statistic":"daily maximum","qualifier":"<=","value":".914","unit":"lb/d","report_only":false,"enforceable":true,"months":"all","limit_set":"MONTHLY"}],"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":"IA","sic":"4941"},"needs":{},"get":"https://passage-data.com/api/v1/permits?state=IA&sic=4941","url":"https://passage-data.com/api/v1/permits?state=IA&sic=4941","page":"https://passage-data.com/dmr/s/IA/4941"},{"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":"iron","place":"US-IA","medium":"surface_water"},"needs":{},"get":"https://passage-data.com/api/v1/limits?parameter=iron&place=US-IA&medium=surface_water","url":"https://passage-data.com/api/v1/limits?parameter=iron&place=US-IA&medium=surface_water","page":"https://passage-data.com/limits/US-IA/iron"},{"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":"IA0003182"},"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=IA0003182"},{"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":"IA0003182"},"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=IA0003182"}]}