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A field evaluation of four micro-irrigation drip treatment and disposal systems was performed to determine if reducing the regulated separation distance between the bottom of the drip line and the seasonal high water table (SHWT) would result in adverse impacts to groundwater resources. Groundwater grab samples were obtained over an 8-year period from piezometers that were installed up-gradient (1), within the drainfield (2) and down-gradient (1) of each system. Samples were analyzed for total nitrogen, nitrate/nitrite and fecal coliform. The soil textures at the sites ranged from sandy loam to loam. The depth of the installed drip lines ranged from 15 cm to 20 cm below the ground surface.