Tap water should not be used to wash your eyes.
Tap water has bacteria in it, if you use it directly to wash your eyes, it may induce eye infections, the most serious is echinococcal amoebic infections, and even lead to blindness, so you should not use tap water to wash your eyes.
If the eyes are uncomfortable or the eyes into the more dirty foreign body, you need to go to the hospital, under the operation of the doctor to wash with medicinal water. If the eyes into the acid, alkali and other chemicals, may cause more important damage to the eye surface, through the liquid dilution of the concentration of organic solvents, can reduce the damage to the eye surface, at this time, you can choose aseptic saline or purified water for emergency treatment, and the tap water contains bacteria, after washing the eyes, it may cause contamination of the eye surface.