The rivers in the north lakeside of Dianchi Lake have poor water quality, causing serious issues in Caohai Lake. Different treatment technologies are recommended for urban, suburban, and estuarine rivers. In-situ treatment works well for urban rivers, while land and fish ponds are best for suburban rivers. Wetland systems can help clean up estuarine rivers. The Interception Project is an effective way to control river pollution, especially when combined with other technologies.