| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:21.58 | GO Fall Halloween Invitational 2025 | 2025-11-01 |
| 100m Breaststroke | 1:35.86 | 2025 Alex Baumann Invitational | 2025-11-21 |
| 100m Butterfly | 1:22.90 | GO Fall Halloween Invitational 2025 | 2025-11-01 |
| 100m Freestyle | 1:08.94 | 2026 NKB National Capital Cup | 2026-02-13 |
| 100m Freestyle | 1:07.75 | GO Fall Halloween Invitational 2025 | 2025-11-01 |
| 100m IM | 1:21.97 | GO King & Queen of the Pool - Pentathlon 2025 | 2025-10-18 |
| 200m Backstroke | 3:04.45 | 2025 Alex Baumann Invitational | 2025-11-21 |
| 200m Breaststroke | 3:28.34 | 2025 Alex Baumann Invitational | 2025-11-21 |
| 200m Freestyle | 2:50.89 | 2025 Eastern Ontario LC Regional Championships | 2025-06-05 |
| 200m Freestyle | 2:34.69 | GO Gee Gee March Break Invitational 2026 | 2026-02-28 |
| 200m IM | 3:02.18 | 2026 NKB National Capital Cup | 2026-02-13 |
| 200m IM | 3:02.51 | 2025 Alex Baumann Invitational | 2025-11-21 |
| 400m Freestyle | 5:52.59 | 2025 Alex Baumann Invitational | 2025-11-21 |
| 50m Backstroke | 37.31 | 2026 NKB National Capital Cup | 2026-02-13 |
| 50m Backstroke | 37.44 | GO Polar Bear Invitational 2026 | 2026-01-16 |
| 50m Breaststroke | 46.17 | 2025 Eastern Ontario LC Regional Championships | 2025-06-05 |
| 50m Breaststroke | 44.47 | GO King & Queen of the Pool - Pentathlon 2025 | 2025-10-18 |
| 50m Butterfly | 35.74 | 2025 Eastern Ontario LC Regional Championships | 2025-06-05 |
| 50m Butterfly | 32.97 | 2026 Eastern Ontario Regional Championship - Winte | 2026-01-30 |
| 50m Freestyle | 29.75 | 2026 NKB National Capital Cup | 2026-02-13 |
| 50m Freestyle | 29.47 | 2026 Eastern Ontario Regional Championship - Winte | 2026-01-30 |
Brooks-Mah, Cassia's top personal bests include 100m Backstroke (1:21.58), 100m Breaststroke (1:35.86), 100m Butterfly (1:22.90), 100m Freestyle (1:08.94), 100m Freestyle (1:07.75).
Brooks-Mah, Cassia swims for Greater Ottawa Kingfish Swim Club.
Brooks-Mah, Cassia has competed in 10 meets.