Septic tank
While a properly maintained and located septic tank does not pose any more environmental problems than centralized municipal sewage treatment, certain problems can arise with septic tanks in unsuitable locations. Since septic systems require large drainfields, they are not suitable for densely built areas.
Water supply and sanitation in Egypt
Soakaway latrines, which are common in rural areas, often do not work properly due to the high groundwater table, infrequent emptying and cracks in the walls. Thus sewage leaks out and contaminates the surrounding streets, canals, and groundwater. Trucks that empty latrines and septic tanks do not necessarily discharge septage into wastewater treatment plants, but rather dump the content in the environment.