| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Breaststroke | 1:51.65 | Swim Ottawa Fall Invitational | 2025-11-01 |
| 100m Butterfly | 1:47.92 | 2025 Eastern Ontario LC Regional Championships | 2025-06-05 |
| 100m Butterfly | 1:42.90 | 2026 Eastern Ontario Regional Championship - Winte | 2026-01-30 |
| 100m Freestyle | 1:25.82 | 2025 Eastern Ontario LC Regional Championships | 2025-06-05 |
| 100m Freestyle | 1:20.87 | 2026 February Freeze Invitational | 2026-02-14 |
| 100m IM | 1:33.48 | 2026 Eastern Ontario Regional Championship - Winte | 2026-01-30 |
| 200m Breaststroke | 3:51.68 | OYO Fall 2025 Short Course Invitational | 2025-11-15 |
| 200m Freestyle | 2:51.45 | 2026 February Freeze Invitational | 2026-02-14 |
| 200m IM | 3:31.62 | Swim Ottawa Fall Invitational | 2025-11-01 |
| 400m Freestyle | 6:34.83 | 2025 Eastern Ontario LC Regional Championships | 2025-06-05 |
| 400m Freestyle | 6:06.90 | 2026 Eastern Ontario Regional Championship - Winte | 2026-01-30 |
| 50m Backstroke | 46.47 | 2026 February Freeze Invitational | 2026-02-14 |
| 50m Breaststroke | 56.38 | 2025 Eastern Ontario LC Regional Championships | 2025-06-05 |
| 50m Breaststroke | 53.10 | KBM Pentathlon | 2025-10-19 |
| 50m Butterfly | 51.02 | 2025 Eastern Ontario LC Regional Championships | 2025-06-05 |
| 50m Butterfly | 45.04 | 2026 Eastern Ontario Regional Championship - Winte | 2026-01-30 |
| 50m Freestyle | 39.67 | 2025 Eastern Ontario LC Regional Championships | 2025-06-05 |
| 50m Freestyle | 36.85 | 2026 Eastern Ontario Regional Championship - Winte | 2026-01-30 |
| 800m Freestyle | 12:57.13 | 2026 February Freeze Invitational | 2026-02-14 |
Bornstein, Cassia's top personal bests include 100m Breaststroke (1:51.65), 100m Butterfly (1:47.92), 100m Butterfly (1:42.90), 100m Freestyle (1:25.82), 100m Freestyle (1:20.87).
Bornstein, Cassia swims for Swim Ottawa.
Bornstein, Cassia has competed in 7 meets.