Most of the excrement is dumped directly into rivers and streams, without processing, and hog waste has become the third largest pollutant of rivers and streams in Taiwan, after industrial and household sewage.
豬隻排洩物又大多未經處理，直接排入河川，如今豬糞單項就和工業廢水、家庭廢水等量齊觀，成為台灣河川三大污染源。