Abstract
Springs are a crucial source of water supply in quarternary volcanic environments, such as Galunggung Volcano in Tasikmalaya Regency, yet their quality and relationships remain poorly defined. Physicochemical properties and stable isotopes of hydrogen (δ2H) and oxygen (δ18O) were used to examine springwater’s eligibility as drinking water sources, assess the connectivity among springs and surface water, and evaluate the origin of groundwater resources. Compared with WHO standards, the springwater samples met the criteria for drinking water eligibility. Eight springs assessed are expected to originate from an unconfined aquifer actively recharging. The isotopic data indicate little or no influence of direct recharge from the rivers on this aquifer. These isotope data, integrated with available information on physical hydrogeology and water chemistry, will be used to identify and define the spring recharge and protection zones.
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