During the first half of March, she made two more voyages to the Green Islands—via Bougainville—before returning to Purvis Bay on 16 March to prepare for the occupation of Emirau Island. At 0630 on 17 March, she shifted from Florida Island to Guadalcanal, where she embarked units of the newly reconstituted 4th Marines. At 1800, she passed through Indispensable Strait with the Emirau invasion force and laid in a course to the northwest of the Solomons and New Ireland. At 0615, she arrived in the St. Matthias Islands and began disembarking troops for the invasion of Emirau, the southernmost island of the group. Once again, Waters' troops made their landing unopposed. The fast transport completed unloading by 1030 and took up station to patrol the transport area against enemy submarines. Finally, at 1930 that evening, she formed up with the other ships of the force and headed back to the southern Solomons. On the evening of 22 March, the force retransited Indispensable Strait and, the next morning, broke up off Savo Island to return to their various anchorages. "Waters" reentered Purvis Bay at 1130 and let go her anchor.