ABSTRACTToxic waste contamination is currently threatening the Atlantic City, New Jersey public water‐supply wells. The geohydrologic data for this region are presented and organized into a format suitable for a numerical model study of the contamination problem. Presentation of the data in light of numerical work reveals the importance of good estimates of boundary conditions, historical pumping records, reliable water‐quality data, accurate well logs, and reasonable parameter estimates. One set of measured head data is simula