This research was carried out to assess effectiveness of enforcement procedures for groundwater management policies in O Mon district of Can Tho city. The specific research objective were: (i) assessment of groundwater level declining from 2000 to 2013; (ii) assessment effectiveness of groundwater policy and (iii) to propose solutions to improved effective groundwater management in the research area. Methods were used: (i) collection and classification of legal groundwater resources documents (valid); (ii) basic statistical data analysis to assess groundwater level declining; (iii) field trip observation and interview both households and businesses were used groundwater about current groundwater management policy; and (iv) Consultation both experts and local authorities were proposed solutions to improved efficiency of groundwater management. The research results showed that, from 2001 to 2010, groundwater level has been declining rapidly in upper-Pleistocen and lowerPleistocen, in which, lower-Pleistocen was the highest declining with average speed (-0,39 m/year). From 2010 to 2013, groundwater level trends stabilize. The groundwater management policy for groundwater exploited license and adjourn groundwater exploited license were shown integrity and unity. However, effective enforcement is not high appreciation due to lack of human resource management without water resources management major. Local staffs manage not only groundwater resources but also mineral resources, hydrometeorology, climate change. Due to expert’opinion, department of environment and Natural resources need high quality staffs with major in Water Resources Engineering, Hydrogeology. Besides, exploited violations have been popularized, especially, lack of exploited groundwater license. Penance violations were showed both integrity and concretize due to Viet Nam water resources law. According to expert’opinion, Punishment is enough for dissuasive groundwater overexploitation. However, we should enhance education and popular Viet Nam water resources law in communities combined with regular inspection of enforced law so that ensuring groundwater resources management is more effective. Keywords: groundwater, management policy, effectiveness, O Mon District.