Combined Sewer Overflow (CSO) Projects

Protect Local Waterways from Contamination

StormTrap provides a cost-effective and environmentally friendly solution to Combined Sewer Overflow (CSO). The system collects and holds diluted sewer water during large rain events so as not to overwhelm sewer pipes and compromise water quality. A StormTrap CSO works seamlessly with the existing sewer system and can be designed to incorporate typical CSO lift pumps and accessories.

Close-up of several leaves with water droplets on their surfaces, captured in black and white.

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Construction workers guide a concrete structure being lowered by a crane into a trench.

CSO Improvement Project – Cottage Grove Heights

Five StormTrap basins were installed in the Cottage Grove Heights neighborhood as part of a combined sewer overflow system for…
Concrete drainage area filled with green algae and scattered debris, including plastic bottles and trash.

Santa-Ana Delhi Channel Diversion

The Santa Ana-Delhi Channel Diversion is a water quality project developed with the objective of eliminating dry weather flow and…
A river flows through a fish ladder structure with multiple steps made of metal and concrete, surrounded by fencing and greenery.

End-of-Pipe and In-Line TrashTrap – Narragansett Bay Commission

This project is part of an ongoing long-term program by Narragansett Bay Commission (NBC) to mitigate water pollution caused by…
Floating metal platform with railings in a body of water, surrounded by a circular barrier with orange segments. Steps lead up to the platform.

Floating TrashTrap on the Anacostia River in Washington DC

Anacostia Watershed, the Takoma Branch had high levels of pollution. About 20,000 tons of trash were flowing into Anacostia annually…

Combined Sewer Overflow (CSO) Solutions

Cutaway illustration of a city street with buildings, trees, a car, and outdoor seating, showing a large underground water management system labeled "StormTrap.

Detention

Manages and controls the volume and discharge timing of stormwater runoff.
Cross-section diagram of a park with trees, a soccer field, pavilion, and underground stormwater management system labeled StormTrap.

Infiltration

Allows water to efficiently discharge into the native soil, preventing flooding.
Cross-section illustration of an urban street and building, showing an underground stormwater management system with water chambers beneath the surface.

Treatment

Removes pollutants from stormwater, targeting either one specific contaminant or a combination of pollutants for a complete stormwater pollution prevention plan.
A cutaway view of a concrete drainage system with grates and metal barriers filtering water containing debris and trash.

Litter, Trash & Debris

Use the natural energy of the water’s flow to trap trash, floatables and solids in disposable mesh nets or baskets.

Be the Future of Stormwater Management

Stay ahead of regulations and protect your community for decades to come. Building the future starts underground.

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Concrete I-beams are stacked in a row, arranged parallel to each other.