According to data released by the Beijing Municipal Commission of Natural Resources and Planning, the Nansha River belongs to one of the more seriously polluted rivers in Beijing, and while the upstream water quality of the Nansha River is relatively clean, the middle and lower reaches of the area are affected by a variety of factors, such as domestic sewage in the urban areas and industrial wastewater, and the water quality is generally poor, with the water quality of the middle reaches and the downstream sections evaluated as poor V, meaning that the water quality is extremely poor.

The methods to control the water environment of Nansha River are as follows:

1. Strengthening the control of pollution sources: Increase the law enforcement and inspection of the sewage enterprises, and standardize the management of pollution discharge during the production process and other behaviors.

2, promote the expansion and renovation of sewage treatment plants: strengthen the construction of sewage collection, expansion of existing sewage treatment plants, promote the use of new sewage treatment technology, reduce the direct discharge of urban sewage to the Nansha River water body.