Millin won the 200-yard backstroke in 2:18.72, and Witter grabbed first in the 500 freestyle in 5:27.05.
Witter led the Vikings' contingent in that event as the Vikings grabbed four of the top six places. Elise Riggle was third in 5:32.02. Riggle also took second in the 400 individual medley in 4:56.52.
Emmi Zheng grabbed a pair of second-place finishes and a third. Zheng was second in the 100 breaststroke in 1:10.46 and was second in the 200 breaststroke in 2:36.17. Sarah Schweickart was second in the 200 individual medley in 2:21.87, and Zheng was third in 2:22.23.
The 400 medley relay team grabbed second in 4:12.12, and the 400 freestyle relay team was third in 3:52.08.
On the men's side, Max Stahl led the Vikings by taking third in the 200 backstroke in 2:06.20. Stahl also took fifth in the 100 backstroke in 57.96 seconds. Travis Charlow posted a fourth-place finish in the 500 freestyle in 5:20.80.
Lawrence took third in the combined team standings with 206 points. Carthage took the title with 641.
The Lawrence women were third with 143, and the men were fourth with 63 points.