Combined Sewer Overflow (CSO) systems are challenged during heavy rainfall when stormwater and wastewater exceed the capacity of collection and treatment infrastructure. ModuTank’s CSO storage tanks provide dependable, above-ground capacity to temporarily store excess flows, helping municipalities reduce overflow events, protect receiving waters, and maintain regulatory compliance. Built from modular, hot-dipped galvanized steel components and fitted with durable membrane liners such as polyethylene, polypropylene, or XR-5 geomembranes, these tanks deliver secure containment while isolating the steel structure from the stored liquids.
Combined Sewer Overflow (CSO) Storage Tanks
CSO mitigation projects are often implemented in dense urban environments where space is limited and construction timelines are compressed. ModuTank’s bolt-together systems assemble quickly using simple hand tools, minimizing site disruption and avoiding the extended schedules associated with cast-in-place concrete structures. Tanks can be configured in rectangular, square, or custom footprints to fit within tight parcels, utility yards, or existing treatment facilities. This flexibility allows CSO storage to be added where underground tunnels, shafts, or deep excavation are impractical or cost-prohibitive.
ModuTank CSO storage tanks can be used for both retention and detention strategies, providing temporary storage during peak flow events and controlled release back into the collection system once capacity becomes available. Systems are available in capacities ranging from thousands to millions of gallons and can be expanded or reconfigured as long-term planning evolves or regulatory requirements change. The modular design allows municipalities to phase projects over time, adding storage incrementally without replacing existing infrastructure.
Designed to withstand repeated fill-and-draw cycles, ModuTank’s CSO storage tanks perform reliably in harsh operating environments and variable weather conditions. Their membrane-lined construction ensures leak-free containment and compatibility with untreated combined sewage, while galvanized steel components provide long service life with minimal maintenance. By offering rapid deployment, flexible layouts, and scalable capacity, ModuTank’s CSO storage solutions give municipalities a practical and cost-effective tool to manage overflow events, protect waterways, and improve overall system resilience.