| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:00.05 | 2026 BC Winter Provincial Championships | 2026-03-05 |
| 100m Breaststroke | 1:13.60 | 2026 CRKW Last Chance Qualifier | 2026-01-17 |
| 100m Butterfly | 59.26 | UBC University Cup Pacific 2025 | 2025-11-08 |
| 100m Freestyle | 50.57 | 2026 BC Winter Provincial Championships | 2026-03-05 |
| 100m IM | 58.15 | Sharks IM Sprint Endurance Challenge | 2026-02-07 |
| 200m Backstroke | 2:19.07 | 2026 CRKW Last Chance Qualifier | 2026-01-17 |
| 200m Freestyle | 1:50.71 | 2026 BC Winter Provincial Championships | 2026-03-05 |
| 200m IM | 2:10.19 | 2026 BC Winter Provincial Championships | 2026-03-05 |
| 400m Freestyle | 4:01.26 | 2026 BC Winter Provincial Championships | 2026-03-05 |
| 50m Backstroke | 27.63 | 2026 West Coast Collegiate | 2026-02-21 |
| 50m Breaststroke | 30.77 | Sharks IM Sprint Endurance Challenge | 2026-02-07 |
| 50m Butterfly | 26.17 | Sharks IM Sprint Endurance Challenge | 2026-02-07 |
| 50m Freestyle | 23.56 | Sharks IM Sprint Endurance Challenge | 2026-02-07 |
Millns, Zac's top personal bests include 100m Backstroke (1:00.05), 100m Breaststroke (1:13.60), 100m Butterfly (59.26), 100m Freestyle (50.57), 100m IM (58.15).
Millns, Zac swims for Campbell River Killer Whales.
Millns, Zac has competed in 9 meets.