The water quality of Miyun reservoir is at medium-eutrophication situation, which is mainly caused by the non-point source pollution (NPS) in the watershed.

目前水质处于中等富营养化程度，非点源是主要污染来源，土地利用则是影响非点源的主要因素。

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With the improvement of the standards in point-source pollution control, the issues of non-point source (NPS) pollution become increasingly prominent.

随着点源污染控制水平的提高，非点源污染问题日益突出。

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