Sanitation Issues
The use of human feces as fertilizer is a risky practice as it may contain disease-causing pathogens. Nevertheless, in developing nations it is widespread. Common parasitic worm infections, such as ascariasis, in these countries are linked to night soil, since their eggs are in feces. There have also been cases of disease-carrying tomatoes, lettuce, and other vegetables being imported from developing nations into developed nations.
Human waste may be attractive as fertilizer because of the high demand for fertilizer and the relative availability of the material to create night soil. In areas where native soil is of poor quality, the local population may weigh the risk of using night soil.
The safe reduction of human waste into compost is possible. Many municipalities create compost from the sewage system biosolids, but then recommend that it only be used on flower beds, not vegetable gardens. Some claims have been made that this is dangerous or inappropriate without the expensive removal of heavy metals.
Read more about this topic: Night Soil
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