Lawrence K. Wang and Mu-Hao Sung Wang (2023). New Technologies for Water and Wastewater Treatment” In: “Evolutionary Progress in Science, Technology, Engineering, Arts, and Mathematics (STEAM)”, Lawrence K. Wang and Hung-ping Tsao (editors). Volume 5, Number 10C, October 2023; 5(10C), 34 pages, . Lenox Institute Press, MA, USA. Lenox.Institute@gmail.com; https://doi.org/10.17613/wena-kx42 ……. ABSTRACT: Selected new water treatment (WT) and wastewater treatment (WWT) technologies are introduced. This technical presentation covers the following subjects: (a) conventional and innovative UV, advanced oxidation process (AOP), and de-oxidation; (b) UV for WT and WWT; (c) emerging biological and physicochemical (PC) technologies, such as, membrane filtration, membrane bioreactor, membrane PC-reactor, ballasted coagulation, sedimentation & filtration, sequencing batch bioreactors and sequencing batch PC-reactors, magnetic ion exchange (MIEX), coagulation, sedimentation and filtration, sequencing batch ion exchange, coagulation, and sedimentation, pre-ozonation, dissolved air flotation (DAF) and filtration/GAC; (d) modern UV facilities of Albany Water Treatment Plant (WTP); (e) the America’s first DAF WTP in Lenox, MA, USA; (f) once the World’s largest 36.5-MGD DAF WTP in Pittsfield, MA, USA; (g) Largest 75-MGD DAF WTP in Greenville, South Carolina, USA; (h) emerging sequencing batch reactors (SBR); such as, sequencing batch aerobic sludge digestion, sequencing batch PC-reactor for water or wastewater treatment, sequencing batch membrane bioreactor, sequencing batch ballasted clarification, sequencing batch magnetic ion exchange, sequencing batch DAF, and sequencing batch granular activated sludge process