In response to increasingly stringent legislative requirements and the limited availability of studies addressing phosphorus recovery in wastewater treatment plants (WWTPs) treating low-strength wastewater, this study evaluates the phosphorus recovery potential of six municipal WWTPs in Bulgaria. The methodology combines operational monitoring data provided by water operators with supplementary laboratory analyses. Phosphorus recovery potential was assessed with respect to both the requirements of currently available recovery technologies and the regulatory criteria established in Austria, Switzerland, and Germany. Three phosphorus-bearing streams were analysed: sludge dewatering liquor, dewatered sludge, and sludge ash. The results indicate that lower influent wastewater dilution (respectively higher influent phosphorus loads), and the presence of biological phosphorus removal are generally associated with higher phosphorus contents in the sludge line. Among the recovery pathways evaluated, phosphorus recovery from sludge dewatering liquor appears to be the most feasible option, with five of the six studied WWTPs exhibiting conditions compatible with available recovery technologies. In contrast, phosphorus recovery from sludge ash is unlikely to be feasible for most of the investigated WWTPs, as the phosphorus content in the ash was generally below the levels required for the efficient application of currently available full-scale recovery technologies. The findings further suggest that the direct adoption of existing European phosphorus recovery requirements would be challenging for the studied Bulgarian WWTPs, primarily due to the high dilution of influent wastewater. The study highlights the importance of considering wastewater strength and plant-specific phosphorus distribution when developing phosphorus recovery strategies and regulatory frameworks for countries characterized by low-strength municipal wastewater.