The effects of nonpoint source pollutants from a small agricultural alluvial watershed on groundwater quality were investigated and analyzed in this study. Water quality factors of pH, electric conductivity (EC), total nitrogen (T-N), nitrate nitrogen (NO3-N), ammonium nitrate (NH4-N), and total phosphorus (T-P) concentrations were monitored at the watershed located in Shinbook-myon, Chunchon, Kangwon-do, Korea for 2 years. Groundwater samples of about 2 liters from 7 to 20 farm wells were regularly collected and analyzed with respect to the water quality factors which were again analyzed with respect to time and land uses of residential, agricultural, livestock feedlot, greenhouse, and natural areas.
