An initial investigation was undertaken by The Department of Primary Industries and Resources SA (PIRSA), into the increase in salinity within wells on the Northern Adelaide Plains (NAP). This involved interpreting groundwater salinity data from a representative group of 218 wells that have had water samples taken for analysis at least once per year between 1987 and 1998. Of this initial group, 33 wells completed in the upper Tertiary aquifers (T1/T2) show an abnormal increase in salinity over this period, and 41 other T1/T2 wells require additional sampling to confirm their apparently rising salinity trends. The outcomes from this investigation warrant a similar analysis of the remaining 1000-4000 operational and disused wells in the NAP.