Dogan, SelimAzarm, Said Ali Sina2024-12-102024-12-1020242214-7144https://doi.org/10.1016/j.jwpe.2024.106551Dogan, Selim/0000-0002-2281-4967Coastal aquifers are increasingly threatened by seawater intrusion (SWI) due to unsustainable groundwater extraction practices. This study highlights the significance of addressing SWI in coastal regions, particularly in Mugla province, Turkiye, through the innovative use of reclaimed water for groundwater recharge. We investigate the economic viability and technical feasibility of utilizing reclaimed water from selected wastewater treatment plants (WWTPs) for this purpose. The study evaluates necessary infrastructure upgrades and associated costs for the construction and operation of injection wells, along with a detailed analysis of reclaimed water volumes and compliance with injection standards. Employing a multi-criteria ArcGIS site selection approach, optimal well locations are identified based on key factors, including proximity to roads, residential areas, fault lines, WWTPs, coastlines, slope, and land cover. Our findings reveal that while the majority of the study area is unsuitable for injection wells, 6 % is rated as suitable and 1.2 % as highly suitable. The total investment required amounts to approximately $11.4 million (USD) for WWTP upgrades and $1.3 million for well construction, with estimated annual operational costs of $12.6 million. This study underscores the potential of reclaimed water as a sustainable solution for SWI management and provides a strategic framework for groundwater resource management in coastal areas. Future research should build upon this methodology by incorporating additional criteria and exploring diverse scenarios to enhance injection well site selection and operational efficiency.eninfo:eu-repo/semantics/closedAccessSuitability AnalysisSeawater IntrusionInjection WellSustainabilityCost AnalysisArticle10.1016/j.jwpe.2024.1065512-s2.0-85208983281