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Changes in soil water retention, pore size distribution, and saturated hydraulic conductivity due to wastewater application by subsurface drip systems were investigated at two sites in Texas. Undisturbed soil core samples were collected from different locations and depths around drip emitters and from outside the drip fields. Core samples were used to determine hydraulic conductivity and soil water retention. Application of wastewater resulted in increased soil water retention, decreased volume of pores with large radii, and a decrease in saturated hydraulic conductivity. The major influence of wastewater application on soil hydraulic properties occurred slightly below the drip emitter. This decrease in hydraulic conductivity reflected the decrease in volume of large soil pores compared to that of small pores. Application of treated effluent had more influence on soil hydraulic properties in the cross section along the drip line than the cross section perpendicular to the drip line.