WCS Submerged Bio-reactors Service Wastewater Compliance Systems, Inc. (WCS) is a provider of submerged bio-reactors used to enhance the biological activity of treatment systems in order to reduce ammonia, BOD and TSS concentrations. Our goal is to help communities comply with state and federal environmental regulations without resorting to expensive mechanical plants. Whether yours is an existing system, or new construction, Bio-Domes can help minimize the expense of your treatment system.