Before significant environmental studies most people believed that industry was the major source of N and P in Thai freshwater lakes, estuaries and the ocean. However, the analysis of the data from the Department of Pollution Control and Industry Control shows that the primary source of N and P is from municipal wastewater. In Thailand, the major industrial wastewater sources of N and P are fish canning, chicken processing, and pig slaughterhouses. Quantities of nitrogen and phosphorus from different industrial wastewater sources are shown in Table 2. Study the characteristics of domestic wastewater from stabilization ponds Low efficiencies of nutrient removal from domestic wastewater by biological treatment in stabilization ponds were found. Influent and effluent data of stabilization ponds from Khon Kaen province