US lawFederal (United States)RegulationsTitle 40 CFR — Protection of EnvironmentChapter I — ENVIRONMENTAL PROTECTION AGENCYPart 117 — DETERMINATION OF REPORTABLE QUANTITIES FOR HAZARDOUS SUBSTANCESSubpart A — General Provisions117.240 C.F.R. § 117.2Abbreviations.Last amended: 2016Year: 2026Length: 11 wordsOfficial source Cite as 40 C.F.R. § 117.2 (2026)NPDES equals National Pollutant Discharge Elimination System. RQ equals reportable quantity.Previous40 C.F.R. § 117.1Next40 C.F.R. § 117.3