There are two main sources of water pollution, categorized as point sources and nonpoint sources. Point source pollution comes from specific locations, such as through a pipe or a ditch. Producers of point sources include factories, sewage treatment plants, and oil tankers. Nonpoint source pollution, on the other hand, cannot be traced to a specific location. Nonpoint sources are more dangerous because they are difficult to contain and research. Examples of nonpoint sources include acid deposition and chemical runoff into the surface
