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Water balance between production and injection in a geothermal water dominated reservoir is very important to maintain the sustainability of steam power plant production. So that in order to plan the amount of steam produced, a natural injection calculation must be done first. This natural substance is water that is infiltrated into a reservoir that comes from rainwater inside the reservoir of the PLTP. The method of knowing natural injection is by analyzing the availability of water in the PLTP watershed, the area of the river flowing into reservoir is 30 km2, with annual rainfall around 2400 mm. One of the calculation methods used is the FJ.Mock method. This method transforms rainfall into run-off based on the concept of a hydrological model. Water availability is calculated in daily, monthly and annual rainfall. From the calculation results, the monthly average infiltrations are obtained about 154 kg/s and the annual total is about 1859 kg/s, from the results of this calculation, the total annually mass production must not exceed 1859 kg/s, if mass production exceeds infiltration, injection must be done through injection wells.