{"permit":"VA0056537","name":"Williamsburg Department Public Works & Utilities","state":"VA","as_of":"2026-10-22","source":{"publisher":"U.S. EPA — ECHO / ICIS-NPDES national file","as_of":"2026-10-22","page":"/dmr/p/VA0056537"},"about":[{"label":"What it is","text":"Water Supply (EPA's industry listing)"},{"label":"Where","text":"Williamsburg, Virginia","href":"https://www.openstreetmap.org/?mlat=37.298611&mlon=-76.7#map=14/37.298611/-76.7"},{"label":"Last 12 months","text":"Over a limit once, last in July 2026 (Chlorine, total residual)"},{"label":"Permit","text":"In force until Jul 31, 2030"}],"renewal_due":null,"renewal_check":null,"sector":{"state":"VA","sic":"4941","permits":24,"list":"https://passage-data.com/api/v1/permits?state=VA&sic=4941","page":"https://passage-data.com/dmr/s/VA/4941"},"limits_from_version":null,"record":{"last_filed":"2026-08-31","over":1,"over_by":[["Chlorine, total residual",1]],"window":["2025-10-01","2026-09-30"]},"over_limits":[{"parameter":"Chlorine, total residual","times":1,"find_limits":{"parameter":"chlorine","place":"US-VA","medium":"surface_water"},"get":"https://passage-data.com/api/v1/limits?parameter=chlorine&place=US-VA&medium=surface_water"}],"limits":[{"outfall":"001","parameter":"Oxygen, dissolved [DO]","parameter_code":"00300","statistic":"monthly average minimum","qualifier":">=","value":"5","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":null},{"outfall":"001","parameter":"pH","parameter_code":"00400","statistic":"daily minimum","qualifier":">=","value":"6","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":null},{"outfall":"001","parameter":"pH","parameter_code":"00400","statistic":"daily maximum","qualifier":"<=","value":"9","unit":"SU","report_only":false,"enforceable":true,"months":"all","limit_set":null},{"outfall":"001","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"monthly average","qualifier":"<=","value":"30","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":null},{"outfall":"001","parameter":"Solids, total suspended","parameter_code":"00530","statistic":"daily maximum","qualifier":"<=","value":"60","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":null},{"outfall":"001","parameter":"Carbon, dissolved organic [as C]","parameter_code":"00681","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":null},{"outfall":"001","parameter":"Hardness, total [as CaCO3]","parameter_code":"00900","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":null},{"outfall":"001","parameter":"Aluminum, total recoverable","parameter_code":"01104","statistic":"monthly average","qualifier":null,"value":null,"unit":"mg/L","report_only":true,"enforceable":true,"months":"all","limit_set":null},{"outfall":"001","parameter":"Flow, in conduit or thru treatment plant","parameter_code":"50050","statistic":"monthly average","qualifier":null,"value":null,"unit":"MGD","report_only":true,"enforceable":true,"months":"all","limit_set":null},{"outfall":"001","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":null},{"outfall":"001","parameter":"Chlorine, total residual","parameter_code":"50060","statistic":"maximum","qualifier":"<=","value":".011","unit":"mg/L","report_only":false,"enforceable":true,"months":"all","limit_set":null},{"outfall":"001","parameter":"TU Static Renewal 7-Day Chronic Ceriodaphnia dubia","parameter_code":"TTP3B","statistic":"maximum","qualifier":"<=","value":"1.45","unit":"tox chronic","report_only":false,"enforceable":true,"months":"all","limit_set":null},{"outfall":"001","parameter":"TU Static Renewal 7-Day Chronic Pimphales promelas","parameter_code":"TTP6C","statistic":"maximum","qualifier":"<=","value":"1.45","unit":"tox chronic","report_only":false,"enforceable":true,"months":"all","limit_set":null}],"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":"VA","sic":"4941"},"needs":{},"get":"https://passage-data.com/api/v1/permits?state=VA&sic=4941","url":"https://passage-data.com/api/v1/permits?state=VA&sic=4941","page":"https://passage-data.com/dmr/s/VA/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":"chlorine","place":"US-VA","medium":"surface_water"},"needs":{},"get":"https://passage-data.com/api/v1/limits?parameter=chlorine&place=US-VA&medium=surface_water","url":"https://passage-data.com/api/v1/limits?parameter=chlorine&place=US-VA&medium=surface_water","page":"https://passage-data.com/limits/US-VA/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":"VA0056537"},"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=VA0056537"},{"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":"VA0056537"},"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=VA0056537"}]}