This project focuses on monitoring the noise levels, river water and ground water qualities of Tao Yuan County to understand the varying trend of the monitored analytes. The trends of the variations were analyzed and reviewed to provide the environmental protection office a reference for future regulations. There are 18 noise monitoring stations which were monitored twice every quarter. Results of calendar year 2009 indicate that four stations, Hsin Wu Elementary School, Forestry Bureau Fu Hsin office, Wu Lin High School and Suay Mei Elementary School, exceeded the regulation levels most frequently. The noises were caused by the activities of students, the general public and traffic. Using the environmental quality measurement as an index, Tao Yuan County was listed as an area warranting close observation. Thirty-two monitoring wells located in 11 industrial parks and three military reserved wells were monitored for ground water quality. The analytes that exceeded the type II ground water monitoring standards primarily are ammonia nitrogen, iron and manganese. In addition, the concentration of trichloroethene found in Nei Ding Elementary School monitoring well of Chung Li industrial park exceeds the type II ground water pollution standards. The results are consistent with the historical data. Seventeen monitoring stations for eight rivers were sampled once every quarter to monitor the river water qualities. Results of calendar year 2009 indicate that water samples collected on Tien Liao bridge, and Chung Fu bridge were seriously polluted. Monitor period between January to December of 2009 since there was no significant rainfall. Some precipitation in May caused the measured biological oxygen demands and ammonia nitrogen on the low side. In general, the river water qualities are mostly rated as moderately polluted this year, which remain unchanged compared with previous years.