Top 10 Best Wastewater Design Software of 2026

Bentley SewerGEMS focuses on wastewater and drainage network hydraulic modeling with an interactive model editing workflow and immediate feedback in profile and plan views. The results workflow supports multiple design events and time-based runs so engineers can compare peaking behavior and identify surcharge conditions without rebuilding the model for each case. Model outputs can be exchanged with other Bentley tools and common GIS and CAD environments for coordination during master planning and report production.

A key tradeoff is that SewerGEMS modeling accuracy depends on disciplined data setup for pipe attributes, boundary conditions, and pump behavior before automation helps with scenario throughput. SewerGEMS fits best when teams need repeatable runs across development phases or programmatic alternatives and want automation to carry geometry and parameter changes through to profiles and summary outputs.

Innovyze InfoSewer covers collection system master planning style workflows, including gravity sewer alignment decisions, manhole drop analysis, and lift station and force main design. It is built around repeated model updates for steady-state and extended-period style evaluation so teams can test alternate scenarios without rebuilding from scratch each time. The package also supports GIS-to-model ingestion and CAD exchange paths, which matters when field data starts as shapefiles and plans must return to DWG environments.

A tradeoff is that complex workflows often require disciplined preprocessing for catchments, flow inputs, and boundary conditions so results stay defensible. One common usage situation is a municipality or consulting team iterating on wet weather peaking assumptions and network routing, then exporting layouts and profiles for plan sets.

EPA SWMM centers on collection system modeling for both hydraulic behavior and wet weather performance, including elements for pipes, manholes, storage units, pumps, and control rules. It supports inflow and infiltration representation, dynamic runoff routing into the sewer system, and time-step simulation across changing conditions. Simulation outputs cover hydraulic grade line behavior, depth surcharging, and flow rates that are commonly used for master planning and NPDES-style reporting packages.

A key tradeoff is that effective setup depends on building a complete, engine-ready network model and parameter set, which can be slower than a draw-first workflow in CAD. EPA SWMM fits best when modeling fidelity and repeatable scenario runs matter more than visual drafting speed, such as CMOM evaluation, overflow screening, and design storm comparisons for alternatives.

GoldSim is a wastewater design and performance modeling tool built around time-stepped system simulation rather than drawing-driven hydraulic workflows. It supports collection-system level analysis for flows, storage, and overflow dynamics, with models that can be parameterized and rerun for design storm events.

It also fits projects that need uncertainty handling and scenario comparisons across operating conditions like wet weather peaking and device control behaviors. Its main distinction versus CAD-linked tools is the focus on simulation logic, repeatable run control, and batch scenario evaluation.

SewerGEMS performs wastewater hydraulic modeling and sewer network design workflows from collection system geometry through steady-state and extended-period simulations. It supports gravity sewer analysis with HGL profiling and hydraulic grade line outputs, plus wet-weather peaking and inflow and infiltration inputs for collection system planning.

The software also brings modeling-data exchange for CAD and GIS workflows via LandXML export and GIS import options. SewerGEMS is distinct for how it couples interactive pipe network editing with simulation-ready attribute management across scenarios.

STOAT is a wastewater design workflow tool from WRC Group that focuses on turning hydraulic and drainage design data into reviewable outputs for planning and delivery teams. It supports core collection-system work such as gravity sewer alignment checks, lift station sizing, and force main routing inside a consistent design process.

STOAT also fits projects that need model-to-document continuity, including HGL profiling and report-ready design artifacts that reduce manual transcribing. Integration expectations are typically shaped around document and model exchange rather than a deep, code-first automation surface.

Stormwater Studio focuses on wastewater design workflows that combine hydraulics, collection system layout inputs, and reporting in one engineering-oriented environment. Its core capabilities center on sanitary and stormwater network modeling support, structure sizing checks, and scenario-based design outputs tied to design event inputs.

The tool is positioned for teams that need repeatable calculations tied to pipe and structure attributes and want outputs that can support plan sets. Stormwater Studio also emphasizes interoperability for exchanging design geometry and project artifacts across common design ecosystems.

Pipe Flow Expert targets wastewater collection system design with hydraulic modeling workflows built around gravity sewers and force mains. The software focuses on network-level pipe sizing and profile-style HGL review, with tools that support condition-aware iterations across manholes, junctions, and routes.

It also supports interoperability patterns common in sewer projects, including AutoCAD DWG round-tripping and common data exchange needs for master planning deliverables. The strongest use cases cluster around collection system hydraulics and reporting for design storm event analysis rather than 3D drafting-heavy detailing.

WEST from dhigroup.com generates and edits wastewater design networks using an engineering workflow geared toward layout-to-calculation continuity. The software supports sanitary and storm-related hydraulic design tasks such as steady-state profiling and collection system alignment checks.

It also targets reporting needs for permit-style deliverables by carrying design results through document-ready outputs. Automation is oriented around repeatable design work rather than pure drawing production, with an integration path intended for exchanging geometry and results across tools.

SIMBA# from ifak.eu targets wastewater design workflows with model-to-report execution around collection system hydraulics and plant process documentation. It is distinct for engineers who need traceable study structure across projects, including consistent calculations tied to drawing and document outputs.

Core capabilities center on sanitary and storm system layout inputs, hydraulic profile generation, and documentation deliverables for planning and permitting use cases. The toolset is geared toward repeatable project configurations rather than ad hoc spreadsheet modeling.