Purpose: This study aims to assess the microbiological quality and risks associated with nonregulated lakes used for recreational and economic purposes. It highlights the potential risks these lakes pose to public health, especially in terms of waterborne diseases, due to fluctuations in water quality influenced by seasonal variations, human activities, and environmental factors. By evaluating the microbiological contamination levels of lakes that are not part of the formal monitoring system, this research seeks to fill a gap in understanding the risks posed by these bodies of water. Design/methodology/approach: The research employs a combination of water sample collection and microbiological analysis to determine the contamination levels of Enterococcus spp. and E. coli in various water samples taken from a non-regulated lake (Wyspowo Lake). The study compares contamination levels in nearshore and lake center areas during different months to assess variability in water quality. Statistical analysis was performed to determine the significance of differences between sampling sites. Findings: The study found that the water quality in Wyspowo Lake generally met the acceptable bathing water quality standards. However, exceedances of Enterococcus spp. counts were recorded, particularly for two shore samples collected in June and five collected in July. Shore samples consistently showed higher bacterial levels than samples collected from the lake center, especially for Enterococcus spp. These findings highlight the need for increased monitoring of non-regulated lakes to protect public health. Research limitations/implications: The study is limited by seasonal sampling and the absence of continuous monitoring. Future research could involve more frequent sampling and explore the effects of local human activities on water quality. Practical implications: Improved monitoring systems for non-regulated lakes are essential for protecting public health. The study suggests integrating quality and risk management strategies into local monitoring practices. Social implications: The study has significant social implications as it highlights the potential health risks posed by non-regulated lakes, which are often frequented by local communities for recreational purposes. By improving water quality monitoring and public awareness, the research could contribute to better public health outcomes and foster a culture of responsible recreational use of natural resources. Additionally, it could inform local policy decisions related to water management and environmental health, ultimately enhancing the quality of life for people living near these lakes. Originality/value: This article provides original insight into the microbiological quality and risk assessment of an unregulated lake. It adds value to this field by addressing the microbiological safety of lakes not covered by official regulatory systems and proposing practical solutions for improving water quality monitoring and risk management. The article is intended for local authorities, environmental health experts, and public health, water management, and environmental policy researchers
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