Nonpoint source water pollution regulations in the United States
Nonpoint source (NPS) water pollution regulations are environmental regulations that restrict or limit water pollution from diffuse or nonpoint effluent sources such as polluted runoff from agricultural areas in a river catchments or wind-borne debris blowing out to sea. In the United States, governments have taken a number of legal and regulatory approaches to controlling NPS effluent.
Source: Wikipedia — Nonpoint source water pollution regulations in the United States (CC BY-SA 4.0)