Because of bacteria threaten the human health, care should be paid in the use of such polluted water in areas where people live. As specified in the regulation of water quality, the fecal coliform values up to 200/100 ml of water can be used for irrigation purposes (Harmancioglu et. al., 2001).
2.2 Reuse of waste water in irrigation
Water is polluted physically, chemically and bacteriological by various wastes especially in industrial and agriculture as well as household use. Water contaminated in such ways is called waste water. In the regions where clean water resources is limited or water charges are high, irrigation water requirements are tried to be solved with the use of waste water contaminated with industrial and specially with urbane use (Novotny et. al., 2010). However it should be remembered that the waste water can be used for irrigation purposes if it is treated to the
degree that it meets the quality regulations and communiques criteria. In case of irrigation with waste waters, it is essential to identify an irrigation method and program that will no cause pollution of clean water as a result of deep seepage or runoff. Especially before using bacteriological contaminated waste water for landscape irrigation, the size of the area, population density, pollution degree of water must be analyzed very well (Surampalli & Taygi, 2004). Drip irrigation method should be preferred to sprinkler irrigation in order to minimize the damages to the people around since water is applied to the plants through atmosphere in sprinkler irrigation and to prevent black logs on the plant during irrigation of polluted waters. If sprinkler irrigation method is required to be applied, irrigation will possibly minimize the health and environmental effects in windless conditions.