{"permit":"MS0040029","name":"HEIDELBERG POTW","state":"MS","as_of":"2026-10-22","source":{"publisher":"U.S. EPA — ECHO / ICIS-NPDES national file","as_of":"2026-10-22","page":"/dmr/p/MS0040029"},"about":[{"label":"What it is","text":"Sewage treatment plant"},{"label":"Where","text":"Heidelberg, Mississippi","href":"https://www.openstreetmap.org/?mlat=31.869306&mlon=-88.998833#map=14/31.869306/-88.998833"},{"label":"Last 12 months","text":"Over a limit 14 times, last in July 2026 (Chlorine, total residual; pH; Flow, in conduit or thru treatment plant). 1 required value not reported"},{"label":"Permit","text":"In force until Jun 30, 2029"}],"renewal_due":null,"renewal_check":null,"sector":null,"limits_from_version":null,"record":{"last_filed":"2026-09-30","over":14,"over_by":[["Chlorine, total residual",10],["pH",2],["Flow, in conduit or thru treatment plant",1]],"window":["2025-10-01","2026-09-30"]},"over_limits":[{"parameter":"Chlorine, total residual","times":10,"find_limits":{"parameter":"chlorine","place":"US-MS","medium":"surface_water"},"get":"https://passage-data.com/api/v1/limits?parameter=chlorine&place=US-MS&medium=surface_water"},{"parameter":"pH","times":2,"find_limits":{"parameter":"ph","place":"US-MS","medium":"surface_water"},"get":"https://passage-data.com/api/v1/limits?parameter=ph&place=US-MS&medium=surface_water"}],"limits":[{"outfall":"001","parameter":"BOD, 5-day, 20 deg. 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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-MS","medium":"surface_water"},"needs":{},"get":"https://passage-data.com/api/v1/limits?parameter=chlorine&place=US-MS&medium=surface_water","url":"https://passage-data.com/api/v1/limits?parameter=chlorine&place=US-MS&medium=surface_water","page":"https://passage-data.com/limits/US-MS/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":"MS0040029"},"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=MS0040029"},{"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":"MS0040029"},"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=MS0040029"}]}