JSWE has research committees of specific themes related to water environments by specialists from industries, government, and academia. Through hosting symposiums, lectures, and field trips, they promote research and technical development in fields related to water environments. At the present(2024), the following research committees are working actively.

• MS Technologies
• Anaerobic treatment
• Industrial wastewater engineering
• Water treatment using UV
• Wetland and coastal environment
• Bio-Eco System
• Soil and groundwater contamination
• Material cycle and nonpoint source in watersheds
  (former Nonpoint source pollution)
• Water environment in the tropics and subtropics
• Water supply systems for future
  environmental change( Ending at the end of FY2022)
• Microplastics in Aquatic Environment

• Safety assessment based on bioassays
• Microbial Ecology and Water Engineering
  (former Population dynamics)
• Membrane Technology
• Surrounding living environment
• Health-related Water Microbiology
• Electrochemical Technology
• Systems Analysis(Temporarily inactive)
• Water reclamation and material-cycle in
  agro-industries
• Brackish water habitats
• Local public issues on water environment
• PFAS Treatment Technologies