The Hutuo River system in Xinzhou City saw changes in water quality from 2004 to 2011. Factors like industrial waste and domestic sewage affected the river's pollution levels. The water quality improved after 2009, especially during wet seasons. The correlation between river water quality and precipitation was negative. Industrial waste discharge was a major cause of water quality deterioration, while improvements in sewage treatment plants helped enhance water quality. The key to maintaining and improving water quality lies in the proper operation of sewage treatment plants in the area.