Sand mounds can offer suitable treatment and land application option for constrained sites, particularly those where seperation distance to the water table is limited. Sand mound technologies, comommonly called "Wisconsin Mounds", have been extensively developed and utilised in the United States and a number of studies report on their performance. Their is a growing interest in the application of sand mounds in Australia, but to date little has been published on the performance of such mounds in Australian settings. As failing septic tanks had been contributory to viral pollution of oysters grown in an estuary, Port Stephens Council required upgrades. One option was to replace the absorption field by a sand mound and currently 58 mounds are receiving primary treated effluent and receiving secondary treated effluent in Port Stephens. This paper reports results where two of the mound systems were monitored in detail for a period of six months from mid-2007 using a variety of soil water samplers and groundwater bore.