Wastewater

Tetra Tech is a global leader in the technology and engineering of wastewater solutions. We provide comprehensive wastewater services across the full asset lifecycle, from strategic planning and modelling to design, operations, and asset management. Our experts support utilities, developers, and industry clients in meeting regulatory compliance, improving service resilience, maximising development potential, and delivering sustainable environmental and ecological improvements.

We apply advanced technology, engineering innovation, and data-driven insight to reduce pollution risks, enhance network capacity, and optimise treatment performance. Our integrated approach ensures efficient, climate-resilient infrastructure tailored to the needs of local communities and industrial users.

Wastewater Network Modelling and Asset Management

We use data-driven modelling and analytics to provide insight into system performance, helping clients proactively manage ageing wastewater assets and plan for future demand.

• Drainage and Wastewater Management Plans (DWMPs)
• Catchment management plans
• Integrated catchment modelling and capacity assessments
• Infiltration, inflow and hydraulic evaluations
• Risk-based maintenance planning and optimisation
• Asset performance reviews and deterioration modelling
• Long-term investment and asset management planning

Spill Reduction and Protection

Our specialists design targeted strategies to reduce pollution incidents, protect the environment, and meet evolving regulatory requirements.

• Storm Overflow Assessment Framework (SOAF) studies
• Storm overflow discharge reduction plans
• Catchment delivery plans
• Digital wastewater network management (HydroWeb®/Csoft®)
• Stormwater management and overflow risk analysis
• Spill mitigation plans for high-risk sites
• Combined Sewer Overflow (CSO) reduction strategies
• Implementation of monitoring systems and alarms
• Resilience planning in response to climate change

Wastewater Network Operations

We support the daily operations of wastewater networks through smart systems—including our HydroWeb and Csoft systems for network management—proactive maintenance, and operational optimisation.

• Operational modelling and network diagnostics
• Network monitoring, measurement, and water quality analysis
• Pumping station performance assessments
• Root cause analysis of sewer incidents
• Emergency response and contingency planning
• Training for operations teams and local authorities
• Design and optimisation of real time control (RTC) systems
• Section 82 water quality monitoring, analysis, visualisation, and reporting

Wastewater Process Engineering

Tetra Tech delivers process engineering services to design, upgrade, and optimise treatment facilities for greater performance, compliance, capacity, and energy efficiency.

• Wastewater network solution and treatment works design
• Feasibility studies and option assessments
• Design of new and upgraded wastewater treatment plants
• Process audits and optimisation of treatment systems
• Nutrient removal and biosolids management
• Integration of renewable energy and resource recovery

Industrial and Municipal Wastewater

Our services cover the treatment needs of both municipal and industrial clients, ensuring tailored, compliant, and cost-effective wastewater solutions. We are adept at developing blue green infrastructure and nature-based solutions to improve the ecological environment, enhance social value, and reduce environmental impact.

• Trade effluent assessment and permitting
• Customised treatment solutions for industrial discharges
• Compliance support and regulatory engagement
• Integration of municipal and industrial treatment infrastructure
• Pollution prevention planning and sustainable design