Combined Sewer Overflows

Protect the environment by removing trash, solids and other damaging pollutants from combined sewer overflows.

Combined sewers transport both wastewater and surface water runoff to wastewater treatment plants (WWTPs). Heavy, intense or prolonged rainfall can overload these combined sewers, which can overwhelm downstream treatment facilities. A combined sewer overflow, or CSO - also known as a stormwater regulator - is designed to act as a kind of safety valve for the WWTP that diverts excess wet weather flow, enabling the plant to continue operating and preventing upstream flooding (as was the case in Bucksport, Maine).

Our CSO screening and treatment solutions and technologies catch total suspended solids (TSS) and biochemical oxygen demand (BOD) as well as trash, litter and other gross pollutants during excess flow events, preventing them from passing through the sewer network and thereby protecting both WWTPs and the environment from damaging overflow pollution. 

These technologies are typically small-footprint, non-powered and self-activating, and can also be used to protect sanitary sewer overflows (SSOs).

Learn more

Click the links below to learn more about how our CSO treatment technologies can help. 


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If you'd like further information about CSO products, solutions and technologies please get in touch. 

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