First of all, the city set up eight monitoring teams which set eight monitoring sections in Yangtze River, Jialing River, Fujiang River, and Qujiang River. The sections would be monitored every four hours each day by both automatic and secret artificial methods to closely monitor the quality of water flowing from Sichuan to Chongqing.

Second, the city developed the Plan of Chongqing on Environmental Monitoring and Pre-warning of Seismic Disasters and the Working Plan of Chongqing on Joint Action towards the Emergency Response to the Secondary Environmental Pollution in Two or More Provinces, River Basins and Regions caused by Seismic Disasters. It closely monitored the possible water environmental pollution caused by seismic disasters and further enhanced the joint action mechanism for the emergency response to environmental pollution accidents or incidents involving two or more provinces and river basins.

Third, according to the arrangements of MEP and the municipal government, the city enhanced the emergency monitoring on three sections of inflowing rivers, that is, Zhutuo section of Yangtze River, Jianglize section of Jialing River, and Yuxi section of Fujiang River, as well as three drinking water sources in the Yangtze River Bridge in Jiangjin city, Dongdukou and Chongshazha. The monitoring included 28 basic monitoring items and 60 special monitoring items for centralized drinking water sources and analyzed the acute toxicity, VOC, residual chlorine, and Kjeldahl nitrogen. Up to now, more than 300 person/times of monitoring staff were called out, getting more than 15,000 monitoring data. By May 29, the monitoring results of the automatic water quality monitoring stations of major rivers indicated that water quality in Zhutuo section of Yangtze River, Jinzi section of Jialing River, Yuxi section of Fujiang River, and Matou section of Qujiang River all met the class-III standard specified in Environmental Quality Standards for Surface Water (GB3838-2002) and that the earthquake disaster did not affect water quality of the surface water and drinking water sources in the city. Moreover, the environmental monitoring stations of Wanzhou District and Hechuan District monitored the Pailou section and Dongdukou section in the drinking water sources of their own administrative areas, and the results showed that the water quality in the drinking water sources of the two districts met class-III standard specified in Environmental Quality Standards for Surface Water (GB3838-2002)and that the earthquake disasters did not affect the quality of drinking water sources in the two districts. The quality of drinking water sources in city proper and other districts and counties in Chongqing remained normal for 17 consecutive days, and the intake of water in the water supply plants was also normal.