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Water treatment in indonesia still used coagulant to reduce contaminant. So that, needing pre treatment before conventional water treatment, use infiltration gallery. Infiltration gallery is the one of natural technology for absorbing or filtration contaminant. The main role in filtration of contamint in soil is conductivity hydrulic. There are many kind of soil type with different conductiviy hydraulic. In infiltration gallery method we need to know conduvtivity hydrulic value as preliminary analysis. Because it,s ability is make movement water from one side to otherside, while filtrate the contaminant. More slower conductivity, it is mean that the quality water will be good. The methode use Constant head Permeameter. The result we get, was soil type in same type have different conduktivity hydraulic.