| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:28.14 | KBM Distance & Development | 2025-11-08 |
| 100m Freestyle | 1:15.81 | Brockville Splash & Grill 2025 | 2025-06-01 |
| 100m IM | 1:29.62 | Brockville Splash & Grill 2025 | 2025-06-01 |
| 200m Backstroke | 3:08.01 | 2026 February Freeze Invitational | 2026-02-14 |
| 200m Breaststroke | 3:37.45 | 2026 February Freeze Invitational | 2026-02-14 |
| 200m Freestyle | 2:42.93 | OYO Fall 2025 Short Course Invitational | 2025-11-15 |
| 200m IM | 3:09.03 | OYO Fall 2025 Short Course Invitational | 2025-11-15 |
| 400m Freestyle | 5:45.87 | KBM Distance & Development | 2025-11-08 |
| 50m Backstroke | 42.37 | OYO Fall 2025 Short Course Invitational | 2025-11-15 |
| 50m Breaststroke | 47.72 | Brockville Fall Five 2025 | 2025-10-26 |
| 50m Butterfly | 39.50 | Brockville Fall Five 2025 | 2025-10-26 |
| 50m Freestyle | 37.22 | Brockville Fall Five 2025 | 2025-10-26 |
Casselman, Katie's top personal bests include 100m Backstroke (1:28.14), 100m Freestyle (1:15.81), 100m IM (1:29.62), 200m Backstroke (3:08.01), 200m Breaststroke (3:37.45).
Casselman, Katie swims for Upper Canada Swim Club.
Casselman, Katie has competed in 7 meets.