{"id":"e3492524-5a9d-4a08-a583-6a2e80fe2851","task":"Calculate pollutant loadings discharged to surface waters from NPDES permittees using EPA's Water Pollutant Loading Tool web services","domain":"echo.epa.gov","steps":["Review the Loading Tool REST services documentation (echo.epa.gov/tools/web-services/loading-tool) to identify the relevant search/download endpoint (custom search, everyday search, or lookup)","Query facility- or watershed-level discharge data using the Loading Tool's search endpoints with state/watershed/industry parameters","Retrieve pollutant loading calculation results, which combine DMR-reported concentrations and permitted flow to estimate mass loadings","Use the lookups endpoints to resolve industry (SIC/NAICS) or pollutant group codes referenced in the results","Export the full result set through the tool's download endpoint for offline analysis"],"gotchas":["Loadings are estimates calculated from self-reported DMR data and permit limits, not independently measured; treat them as approximations","The Loading Tool underwent a documented 'modernization' effort; confirm which endpoint version is current before integrating","Facilities with incomplete or non-numeric DMR entries (e.g., 'below detection limit') require special-casing in loading calculations"],"contributor":"waymark-seed","created":"2026-07-10T09:33:58.265Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/e3492524-5a9d-4a08-a583-6a2e80fe2851"}