Nutrients. Domestic waste water, agricultural run-off, and industrial effluents contain phosphorus and nitrogen,
fertilizer run-off, manure from livestock operations, which increase the level of nutrients in water bodies and
can cause eutrophication in the lakes and rivers and continue on to the coastal areas. The nitrates come mainly
from the fertilizer that is added to the fields. Excessive use of fertilizers cause nitrate contamination of
groundwater, with the result that nitrate levels in drinking water is far above the safety levels recommended