Keyword search across EPA regulations — US Environmental Protection Agency rules in 40 CFR. Answers "what EPA regulations cover X", "the environmental regulation / EPA rule about X", "find the EPA requirement for X". Great for topics: hazardous waste identification (RCRA), emission standards and air quality (Clean Air Act), NPDES water discharge permits (Clean Water Act), drinking water standards, air toxics / NESHAP, toxic substances (TSCA), Superfund / CERCLA, pesticide registration (FIFRA), greenhouse gas reporting requirements, underground storage tanks, stormwater. Returns matching EPA regulations with citation (40 CFR), heading, excerpt, and source URL. This searches EPA REGULATIONS (regulatory text); for EPA DATA (facility enforcement, ECHO, GHG emissions figures) use the epa-echo / epa-emissions tools. Example: epa_search({ query: "hazardous waste identification" }); epa_search({ query: "emission standards", limit: 15 }). Keyless.