Abstract: A hydro needle system includes a vial and an array of needles. Each needle in the array is in fluid communication with the vial so as to transport the liquid from the vial to the skin. An actuator is in communication with the array of needles and is configured to apply reciprocating linear motion to the needles so as to repeatedly cause the needles to reciprocate. A casing holds the vial, the needles and the actuator. The casing includes a skin contacting surface that supports the array of needles in a predetermined angular relationship with respect to the skin. At least a portion of the casing is transparent so that the liquid in the vial can be seen therethrough to determine how much liquid remains in the vial during use.