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This study applied the Soil and Water Assessment Tool (SWAT) to the Neshanic River watershed, a suburban watershed with mixed land uses in Central New Jersey, United States. The urban lands were prominently in low-density residential development. The simulated streamflow and water quality parameters including total suspended solids (TSS), total nitrogen (TN), and total phosphorus (TP) were compared to those of the measured values in the watershed. The Nash-Suttcliffe efficiency was 0.60 for daily streamflow and 0.68 for monthly streamflow during the calibration period 1997–2002, and 0.37 and 0.69 during the validation period 2003–2008, respectively. The model satisfactorily simulated the streamflow, but underestimated the streamflow variability (i.e., the flashiness of this suburban watershed). The measured water quality data at seven locations in the watershed were in general agreement with their …