With 30,000 employees working together, Tetra Tech provides clear solutions to complex problems by Leading with Science to address the entire water cycle, protect and restore the environment, design sustainable and resilient infrastructure, and support the clean energy transition. Supports the process design of water and wastewater treatment facilities, including coagulation/filtration, biological treatment, disinfection, residuals handling, advanced treatment, and emerging contaminant removal (e.g., PFAS, GAC, IX).