Lawmakers eye water quality

China's top legislature has been asked to make more efforts to combat water pollution nationwide following an investigation that found 15.5 percent of cities had drinking water sources below standard.

Out of 329 cities, the sources of public drinking water in 278 failed to reach the level required.

This is according to the results of a two-month investigation by a law enforcement group under the Standing Committee of the National People's Congress announced on Thursday.