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, the following 18 research committees are working actively (as of the end of 2009).
- MS Technologies
- Anaerobic treatment
- Industrial wastewater engineering
- Water treatment using UV
- Wetland and coastal environment
- Health-related Water Microbiology
- Bio-Eco System
- Soil and groundwater contamination
- Nonpoint source pollution
- Safety assessment based on bioassays
- Population dynamics
- Membrane Technology
- Surrounding living environment
- Water environmental education
- Water environment and surfactants
- International cooperation on conservation of water environment
- Basin-based water environment solutions
- Comprehensive index of water environment
