Advanced Treatment Units
- AES by Infiltrator (formerly Presby Environmental)
- Anua
- BioMicrobics, Inc.
- BIOROCK
- Delta Treatment Systems, LLC
- E-Z Treat Corp.
- ECOPOD (by Infiltrator, formerly Delta Treatment Systems)
- Eljen Corporation
- Enviro-Aire (by Infiltrator, formerly Delta Treatment Systems)
- FujiClean USA
- Infiltrator Water Technologies, LLC
- Jet Inc.
- MST Manufacturing Inc. DBA MicroSepTec
- Norweco, Inc.
- Orenco Systems, Inc.
- Smith & Loveless, Inc.
- Whitewater (by Infiltrator, formerly Delta Treatment Systems)