What are the sources of nitrogen and phosphorus that cause eutrophication?

The incidence of eutrophication-causing substances varies depending on the region, but taking Yokohama city as an example, nitrogen is 60% domestic wastewater, 20% for factory wastewater, 20% for agriculture, livestock and other wastewater, and phosphorus is 50% domestic wastewater, 30% of factory wastewater, agriculture, livestock and other wastewater is 20%. The figures take into account the nitrogen and phosphorus removal rate (approximately 50%) at the water reclamation center.

The incidence ratio of domestic wastewater is the highest, nitrogen, about 80% for toilets, 20% miscellaneous wastewater from kitchens and laundry, about 70% for toilets, and 30% for miscellaneous wastewater.