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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 ...
Although this is a point source, due to the distributional nature, long-range transport, and multiple sources of the pollution, it can be considered as nonpoint source in the depositional area. Atmospheric inputs that affect runoff quality may come from dry deposition between storm events and wet deposition during storm events.
The Clean Water Act has made great strides in reducing point source water pollution, but this effect is overshadowed by the fact that nonpoint source pollution, which is not subject to regulation under the Act, has correspondingly increased. [41] One of the solutions to address this imbalance is point/nonpoint source trading of pollutants.
Nonpoint source pollutants, such as sediments, nutrients, pesticides, fertilizers and animal wastes, account for more than half of the pollution in U.S. waters. [26] Congress exempted some water pollution sources from the point source definition in the 1972 CWA and was unclear on the status of some other sources.
Nonpoint source pollution occurs when the contamination derives from multiple different sources. This type of pollution is very challenging to manage given that the original source(s) may be difficult to identify. [15] Nonpoint source pollution is the most common type of pollution because as rainfall runs off of land on its path to different ...
TMDL is the end product of all point and non-point source pollutants of a single contaminant. Pollutants that originate from a point source are given allowable levels of contaminants to be discharged; this is the waste load allocation (WLA). Nonpoint source pollutants are also calculated into the TMDL equation with load allocation (LA). [7]
Nonpoint source, or non-point source, or NPS, is a source that does not come from a single point. Point source, contrasts with nonpoint source; Nonpoint source pollution, water pollution; Nonpoint source water pollution regulations, water pollution regulations
Federal regulation of nonpoint source water pollution is often cited as weak, in part because localities often lack the incentive to enforce federal regulations, and federal enforcers do not have the authority to countermand state decisions. [4]