| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:33.38 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 100m Breaststroke | 1:54.32 | 2026 Steve Kingston Memorial | 2026-03-06 |
| 100m Butterfly | 1:51.77 | MAC Jingle Bell | 2025-12-12 |
| 100m Freestyle | 1:25.86 | 2026 Steve Kingston Memorial | 2026-03-06 |
| 100m IM | 1:41.21 | 2025 Downtown Sprint Meet | 2025-10-25 |
| 200m Backstroke | 3:19.26 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 200m Breaststroke | 4:15.02 | 2025 York Invitational | 2025-11-15 |
| 200m Freestyle | 3:05.30 | MAC Jingle Bell | 2025-12-12 |
| 200m IM | 3:32.58 | 2026 MSSAC 14U Future Stars | 2026-01-31 |
| 400m Freestyle | 6:31.43 | MAC Jingle Bell | 2025-12-12 |
| 50m Backstroke | 43.06 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 50m Breaststroke | 54.42 | 2025 Downtown Sprint Meet | 2025-10-25 |
| 50m Butterfly | 45.33 | MAC Jingle Bell | 2025-12-12 |
| 50m Freestyle | 38.38 | 2026 MSSAC 14U Future Stars | 2026-01-31 |
McGowan, Isla's top personal bests include 100m Backstroke (1:33.38), 100m Breaststroke (1:54.32), 100m Butterfly (1:51.77), 100m Freestyle (1:25.86), 100m IM (1:41.21).
McGowan, Isla swims for Toronto Swim Club.
McGowan, Isla has competed in 8 meets.