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Nutrient pollution, a form of water pollution, refers to contamination by excessive inputs of nutrients.It is a primary cause of eutrophication of surface waters (lakes, rivers and coastal waters), in which excess nutrients, usually nitrogen or phosphorus, stimulate algal growth. [1]
In coastal waters, nitrogen is commonly the key limiting nutrient of marine waters (unlike the freshwater systems where phosphorus is often the limiting nutrient). Therefore, nitrogen levels are more important than phosphorus levels for understanding and controlling eutrophication problems in salt water. [60]
Nutrients such as nitrogen and phosphorus tend to be limiting resources in standing water bodies, so increased concentrations tend to result in increased plant growth, followed by corollary increases in subsequent trophic levels. [a] Consequently, trophic index may sometimes be used to make a rough estimate of biological condition of water ...
From 2015-2019, 11 different conditions were measured in various areas of the Elizabeth River. Throughout the river, there were consistently high levels of nitrogen and phosphorus, along with high levels of other contaminants contributing to the poor quality of life for bottom feeders along the river.
The 2001 Action Plan is a national strategy to reduce Gulf hypoxia with a focus on reducing the nitrogen and phosphorus nutrient loads to the northern Gulf coming from the Mississippi River. The Action Plan proposes three goals: a Coastal Goal, a Within Basin Goal, and a Quality of Life Goal. [ 12 ]
Phosphates are not toxic to people or animals unless they are present in very high levels. Digestive problems could occur from extremely high levels of phosphate. The following criteria for total phosphorus were recommended by the U.S. Environmental Protection Agency. No more than 0.1 mg/L for streams which do not empty into reservoirs,
Municipal waste, high in nitrogen and phosphorus, is sometimes treated by wastewater facilities or through soil filtration, but often some excess nutrients leak and contribute to eutrophication. [50] Human sewage waste in the United States accounts for about 12 percent of average annual nitrogen input into rivers. [ 50 ]
Nitrogen and phosphorus loading from human activity has accelerated eutrophication of certain rivers, lakes, and wetlands, resulting in loss of habitat, changes in biodiversity and, in some cases, loss of recreational potential. [11] Lake Winnipeg suffers from the rapid absorption of the elements phosphorus, nitrogen, and carbon.