Sixteen water samples were collected from thermal spring, river, and shallow well in Kotamobagu geothermal field. Temperature of waters, Electronic Conductivity (EC) and pH were measured on site and chemical analysis in laboratory. The analyzed results were plotted on Cl-SO4-HCO3 ternary diagram, and characterized into form groups of SO4, Cl-SO4, and HCO3 From Na-K-Mg plot, one hot spring water is determined as a partially equilibrium water, and all other samples are immature waters. The geochemical temperature was calculated by quartz no steam loss is about 160°C. The maximum temperature with Na-K-Ca-Mg geothermometer is estimated in a range 180-220⁰C with the maximum of 260⁰C. A conceptual model of hydrothermal system of Kotamobagu was developed.

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