The study analyzes the water quality status within the "Duboko" Regional Sanitary Landfill Complex. The investigations indicated that landfill leachate is potentially the most significant source of environmental pollution. Landfill leachate must therefore be efficiently collected and treated prior to discharge. Based on the investigations conducted in 2025, other available data, and previous studies, conclusions and recommendations are presented concerning water quality and potential treatment technologies. These technologies may involve a combination of biological and physicochemical processes, including membrane separation processes, capable of ensuring a high quality of treated effluent that complies with the applicable emission limit values and does not compromise the required quality of the receiving water body (Class II).