Discharge effluent limit indicator

NPDES permittees with PFAS discharge monitoring or effluent limits, sourced from EPA's PFAS Analytic Tools 'Discharge Monitoring Reports' layer (ArcGIS FeatureServer layer 15, PAT_Discharge_Monitoring_Reports), itself built from ICIS-NPDES DMR data already restricted upstream to PFAS-family parameters. The raw layer is 96,155 monitoring-event rows (facility x outfall x PFAS parameter x year); fetch.py aggregates client-side to one row per unique NPDES_Permit_Number (1,110 permittees), rolling up distinct parameters monitored, whether any parameter carries an effluent limit, most recent monitoring year, and outfall count. No street address or ZIP is published by this dataset; location is carried by lat/lon (99.91% fill).