Most downstream pollution comes from industrial and residential sources, but in sparsely populated upstream regions, not only have the water and soil been damaged by tea plantations, fruit orchards and vegetable farms, but excessive use of fertilizers has led to half of the reservoirs becoming infested with algae.
河川下游污染大多來自工廠與家庭；但人煙少至的上游水源區，滿布超限利用的茶園、果樹、高冷蔬菜，不僅破壞水土，其肥料過度使用，已使一半的水庫滋生藻類。