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The Hydrologic Simulation Program-Fortran (HSPF) was combined with CREAMS-PADDY to assess the wastewater reuse effects on watershed nutrient loads. Study watershed, having 385 ha in size, is located in the mid west of Korean Peninsula. Paddy field consists of 18.8% of land use in the study watershed. Parameters of the HSPF related to hydrology and water quality were calibrated from 1996 to 1997 and validated from 1999 to 2000 using observed hydrologic and water quality data collected at the watershed outlet. There was good agreement between the observed and simulated runoff. Total flow errors were -0.8% and 1.4% for the calibration and validation period, respectively. The errors between observed and simulated total nitrogen and phosphorus were 9.4% and 13.5%, respectively for the calibration period, and 42.7% and 73.8% for the validation period. Wastewater reuse effects on watershed were estimated by comparing the nutrient loads between conventional water and reclaimed wastewater were irrigated on all the paddy fields in study watershed. The simulation results indicated that wastewater reuse on 18.8% of paddy fields in the 385 ha sized watershed have a nutrient loads increase effect with the 10.3% of TN load and 14.0% of TP load.