Water and wastewater treatment processes are very important facilities in high-tech industry. These two processes involve the substantial use of chemicals such as HCl, NaOH, CaCl2 etc. and significant energy (electricity) for treatment. Currently, advancements in electrochemical processes, membrane separation, and anaerobic biological treatment technologies, driven by collaborative efforts between industry, government, and academia, have resulted in numerous successful cases. This presentation will elaborate on these technologies and propose an integrated approach to gradually attain the future goal of achieving carbon neutrality in water and wastewater facilities.