Junior Presley Wetterstrom set a school record in the 200 breaststroke with a time of 2:12.96.
The Cougars set 20 personal bests across seven events.
The Cougars set a school record in the 200 free relay.
The Cougars will face a four-team field in Iowa City, Iowa.
Ciera Kelly, Linnea Lindberg, Jasmine Margetts, Penny Nichols, and Taylor Shewchuk have each signed an NLI to swim at WSU.
The Cougars defeated the Lumberjacks, 181-80, and have won three-straight dual meets.
The WSU swim team took first and second place in all 14 events.
The Cougars are coming off a Pac-12 victory against the Arizona State Sun Devils.
The WSU swim team defeated Arizona State and took first place in 10 of 14 events.
The Sun Devils travel to the Palouse for the first time in program history.
Freshman Anna Brolin took the top spot in the 100 fly, the first victory of her career.
WSU plays host to Arizona for the first time in program history, Friday, Oct. 17, at 5 p.m. at Gibb Pool.