Eighteen major reservoirs in Beijing have seen their water quality improved in recent years, including 16 reaching Grade II-III drinking water standards, according to the city's water authorities.

Beijing has a total of 88 reservoirs, mostly located in the mountainous areas, and 18 of them are large- and medium-sized reservoirs, each storing at least 10 million cubic meters of water. 

The water of the Miyun Reservoir, the largest reservoir in Beijing, has met Grade II drinking water standard, and the water in reservoirs such as the Shisanling Reservoir, the Zhuwo Reservoir and the Banchengzi Reservoir has improved after the implementation of regulatory measures. 

The Beijing Water Authority said large- and medium-sized reservoirs in Beijing stored a combined 2.73 billion cubic meters of water as of Nov. 22, up by 340 million cubic meters compared with the same period of last year. 

Regulatory measures, such as the banning of illegally built piers, eateries and open-air barbecue grills in surrounding areas, have been enforced to clean up pollution sources. 

The Haizi Reservoir in Pinggu District saw its water quality reach Grade II standard in this summer for the first time in 20 years.

The water quality has considerably improved also due to the South-to-North Water Diversion Project, which has replenished some drying reservoirs in Beijing.

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