Abstract: The present invention provides a method and apparatus for the treatment of waste water, particularly for the treatment and/or reduction of floating pollutants in storm water waste streams. The apparatus of the invention achieves a high containment level of floating pollutants compared to conventional oil/gas traps available for catch basin use. In a preferred embodiment, the device of the invention is a catch basin trap that arrests the flow of pollutants, particularly floating pollutants. The trap is designed and installed in such a manner that a sealed system is created, ensuring that all fluid flow (e.g., storm water discharge) must pass through the trap and cannot bypass the trap due to unreliable trap attachment mechanisms or unsealed joints. Containment of floating pollutants is achieved.