name: EPA Vocabulary description: >- Controlled vocabulary spanning the U.S. Environmental Protection Agency's public data and API surface — Envirofacts, AQS, ECHO, TRI, ATTAINS, FRS, Clean Air Markets, CIP, CSB, ELG, How's My Waterway, and the broader regulatory programs the agency operates under the Clean Air Act, Clean Water Act, RCRA, Safe Drinking Water Act, CERCLA/Superfund, EPCRA, and TSCA. url: https://raw.githubusercontent.com/api-evangelist/epa/refs/heads/main/vocabulary/epa-vocabulary.yml created: '2026-05-29' modified: '2026-05-29' domains: - name: AirQuality description: Ambient air monitoring data — criteria pollutants, hazardous air pollutants, monitors, sites, and quality assurance. - name: WaterQuality description: Surface water and drinking water condition assessments, dischargers, watersheds, and impairments. - name: HazardousWaste description: RCRA-regulated waste generators, handlers, treatment/storage/disposal facilities, and manifests. - name: ToxicRelease description: TRI Form R / Form A facility-level reporting on releases and transfers of listed toxic chemicals. - name: Compliance description: ECHO enforcement actions, civil and criminal cases, inspections, and violations. - name: Facilities description: Facility Registry Service master records and program-specific facility data. - name: ChemicalSafety description: CTX/CompTox chemical, hazard, exposure, and bioactivity data. - name: SuperfundCleanup description: SEMS and Superfund site cleanup status, contaminants, and remediation milestones. - name: ClimateAndGHG description: Greenhouse gas emissions reported under GHG Reporting Program, plus FrEDI and related climate impacts. - name: PowerSector description: Clean Air Markets — emissions, allowances, monitoring plans, QA/cert for fossil power plants. - name: DrinkingWater description: SDWIS public water system inventory, violations, and sampling. - name: Watersheds description: WATERS, StreamCat, ATTAINS, How's My Waterway — assessment units, impairments, TMDLs. - name: SchoolBusReform description: Clean School Bus program — rebate eligibility, awards, fleet electrification. - name: WaterSense description: Effluent guidelines (ELG) search, water-efficient product labelling. programs: - name: CleanAirAct abbr: CAA description: 42 U.S.C. § 7401 — National air quality standards, mobile sources, hazardous air pollutants. - name: CleanWaterAct abbr: CWA description: 33 U.S.C. § 1251 — NPDES discharge permits, water quality standards, dredge-and-fill. - name: ResourceConservationAndRecoveryAct abbr: RCRA description: 42 U.S.C. § 6901 — Hazardous and solid waste management. - name: SafeDrinkingWaterAct abbr: SDWA description: 42 U.S.C. § 300f — Public water system protection and primacy. - name: ComprehensiveEnvironmentalResponseCompensationAndLiabilityAct abbr: CERCLA description: 42 U.S.C. § 9601 — Superfund cleanup of hazardous substance releases. - name: EmergencyPlanningAndCommunityRightToKnowAct abbr: EPCRA description: 42 U.S.C. § 11001 — TRI reporting, Local Emergency Planning Committees. - name: ToxicSubstancesControlAct abbr: TSCA description: 15 U.S.C. § 2601 — Chemical risk management and Section 8(a)/(d)/(e) reporting. - name: NationalEnvironmentalPolicyAct abbr: NEPA description: 42 U.S.C. § 4321 — Environmental impact statements and assessments. dataSystems: - name: Envirofacts description: Cross-program data warehouse aggregating RCRA, TRI, SDWIS, NEI, GHG, and more. - name: AQS fullName: Air Quality System description: Ambient air pollution monitoring data from state, local, tribal, and federal agencies. - name: ECHO fullName: Enforcement and Compliance History Online description: Public access to inspection, violation, and enforcement data for regulated facilities. - name: FRS fullName: Facility Registry Service description: Master inventory of EPA-regulated facilities cross-walked across programs. - name: TRI fullName: Toxics Release Inventory description: Facility-level releases and transfers of TRI-listed chemicals. - name: ATTAINS fullName: Assessment, Total Maximum Daily Load Tracking and Implementation System description: State water quality assessments, impaired waters, TMDLs, and actions. - name: SDWIS fullName: Safe Drinking Water Information System description: Public water system inventory, sampling results, violations. - name: NEI fullName: National Emissions Inventory description: Triennial air pollutant emissions inventory for all source categories. - name: GHGRP fullName: Greenhouse Gas Reporting Program description: Annual GHG emissions reported by large emitting facilities. - name: CAMD fullName: Clean Air Markets Division description: Acid Rain Program, Cross-State Air Pollution Rule, MATS — continuous emissions monitoring. - name: SEMS fullName: Superfund Enterprise Management System description: Superfund site management, cleanup phases, and milestones. - name: CTX fullName: Center for Computational Toxicology and Exposure APIs description: Chemical, hazard, bioactivity, and exposure data for thousands of chemicals. operationalConcepts: - name: Pagination description: Most EPA APIs page via offset/limit or first:last range path segments (Envirofacts). - name: ApiKeyAuthentication description: AQS, CAM, and api.data.gov-fronted APIs require an email and key or X-API-Key header. - name: NoAuthentication description: Envirofacts, ECHO, How's My Waterway, and several public data services are anonymously accessible. - name: BulkDownload description: Many programs publish bulk CSV / Parquet / ZIP downloads alongside the API for large extracts. - name: GraphQL description: Envirofacts publishes a GraphQL endpoint for complex cross-table joins. - name: GovernanceAndPrimacy description: Many EPA programs are co-administered by state agencies that hold primacy; data flows through state portals into national systems. formats: - JSON - JSONP - XML - CSV - Excel - PDF - HTML - Parquet - GeoJSON - SHP