The successes came despite the team as a whole losing 162-120 to the Freedom High Eagles.
New state qualifiers were junior Will Doty in the 200 Free, senior Karen Hamill in the 50 Free and junior Sam Butler and senior Kelley Frank in the 100 Free.
Freshman Julia Estrada set a school record in the 500 Free, as did the boys relay team (freshman Lucas Cherry, senior Sam Parker, Doty and Butler) in the 200 Medley and 200 Freestyle.
Next up, the Mustangs face Broad Run High this Saturday, Jan. 30, at the Claude Moore Rec Center pool before moving on to the Dulles District Championships on Feb. 5.
This is the first year for Mason, a single-A school, in the larger Dulles District.