Students from the Master of Environmental Science program at Universitas Gadjah Mada (UGM) have completed a comprehensive field study to analyze the phenomenon of seawater intrusion and its impact on groundwater quality in the coastal areas of Pemalang Regency. The Field Work Course (KKL) was conducted from 14–17 July 2025 across four strategic sub-districts—Pemalang, Taman, Petarukan, and Ulujami—representing the diverse characteristics of the coastal region.
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Seawater intrusion is a hidden threat that jeopardizes the sustainability of water resources in Indonesia’s coastal zones. Groundwater in these areas plays a critical role in meeting community needs, yet the intrusion of seawater can significantly reduce water quality, posing risks to public health and local water security. This issue is exacerbated by anthropogenic activities, including excessive groundwater extraction, land-use changes, and coastal development pressures. “This study serves as an initial step to understand the underground crisis of freshwater slowly being contaminated by seawater,” said the Research Team Coordinator, emphasizing the urgency of a rigorous scientific investigation into coastal hydrogeological dynamics.
The research employed a structured scientific approach, collecting water samples from dug wells and boreholes using a Water Checker Multiparameter to measure key parameters such as salinity, Total Dissolved Solids (TDS), Electrical Conductivity (EC), and pH. GPS devices were used for precise spatial documentation. The study aimed to analyze the distribution patterns and severity of seawater intrusion and evaluate its impacts on groundwater quality in Pemalang’s coastal areas. “Field conditions indicate significant variations in groundwater quality, reflecting the challenges faced by coastal communities,” noted a team member. The findings are expected to provide a scientific basis for sustainable water management policies, offering early insights into potential groundwater contamination and supporting the sustainable utilization of freshwater resources in coastal areas.
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This research directly contributes to several Sustainable Development Goals (SDGs), particularly SDG 6 (Clean Water and Sanitation) by promoting the sustainable availability and management of clean water, and SDG 14 (Life Below Water) in the context of protecting and sustainably utilizing coastal and marine resources. The study also supports SDG 13 (Climate Action) through adaptive measures addressing the impacts of climate change on coastal water resources. “We hope that the results of this research will serve as a foundation for adaptive and sustainable water resource policies,” the team added.
Author: Seawater Intrusion STudies Team