designated as water pollutants. To manage water quality safety, heavy metals and phenols are designated as specific water pollution material. An emission standard is one of the regulatory methods to achieve environmental standards, and restricts the concentration of discharge water from a discharging business. The standard is set with consideration given to environmental standards and purification capacity of a stream. The Act on Water Quality and Ecosystem Conservation applies wastewater emission standards to 29 items (e.g., organic materials, suspended solids, and phenols), and classifies the water quality of each watershed into 4 levels (Clean, Ga, Na, Special) for each region. Organic material and suspended solids are handled differently according to the amount of wastewater discharged from a business. That is, considering the effect that it has on the stream, stricter emission standards are applied to a business that discharges wastewater in the amount of more than 2,000 m3/day than to smaller businesses, in order to incorporate a quantity regulation method as well as a concentration regulation method. Taking the capacity of wastewater processing facilities into account, special emission standards are applied to businesses whose wastewater flows into wastewater processing facilities in industrial complexes or agricultural/industrial complexes. Since 1997, emission standards regarding nitrogen and phosphorus materials have been applied to all businesses located at Paldang Lake, Daecheong Lake, Nakdong River and Nakdong Estuary watershed to prevent the eutrophication of lakes and marshes. All businesses in Korea have been subject to the same standards since 2003. The amount of chemicals discharged from industries into the watershed have increased with the growth of the chemical industry and the increase in international trade. Therefore, pilot studies on the ecotoxicity of discharged water for fish (minnow), daphnia magna, and birds have been undertaken since 2002, to examine the toxicity of unknown harmful materials outside of emission standards items. The Act on Water Quality and Ecosystem Conservation was amended in November 2007 to adopt an integrated toxicity management system based on the result of this research. Telemetry Monitoring System (TMS) Tele-Monitoring System (TMS) refers to a system that monitors the emission state of pollution materials on a 24-hour basis by creating an online connection between automatic measurement devices, which are attached to the discharging outlet of wastewater processing facilities and wastewater-producing businesses, and a remote water quality control center. The objective is to prevent water pollution by managing and monitoring the quality of discharged water, while