| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Breaststroke | 1:07.12 | 2026 OUA Swimming Championships | 2026-02-19 |
| 100m IM | 1:06.35 | OUA Sprint Invitational - Semis Results | 2025-10-18 |
| 200m Breaststroke | 2:27.08 | 2026 OUA Swimming Championships | 2026-02-19 |
| 400m Freestyle | 4:36.03 | MACU Tri Meet with UOG & WAT | 2026-01-17 |
| 400m IM | 4:47.47 | 2026 OUA Swimming Championships | 2026-02-19 |
| 50m Breaststroke | 33.09 | OUA Sprint Invitational - Semis Results | 2025-10-18 |
| 50m Freestyle | 26.20 | OUA Sprint Invitational - Semis Results | 2025-10-18 |
Declan MacDonald's top personal bests include 100m Breaststroke (1:07.12), 100m IM (1:06.35), 200m Breaststroke (2:27.08), 400m Freestyle (4:36.03), 400m IM (4:47.47).
Declan MacDonald swims for University of Guelph.
Declan MacDonald has competed in 6 meets.