Phosphorus is now commonly used as a red herring blaming nutrient pollution, but
the more important nitrogenous nutrient (fertilizer) pollution originates from
different sources, now mostly blamed on the runoffs from farms and cities.
However, what the public does not know is the best kept national secret, that
EPA never implemented the CWA, because it used an essential test (BOD) incorrect
and not only ignored 60% of this oxygen exerting waste in sewage, but all the
nitrogenous (urine and protein) waste. This, while this waste, like fecal waste,
exerts an oxygen demand and also is a fertilizer for algae. By calling this
waste now a nutrient and blaming it mostly on farmers, the public has been
successfully kept in the dark.