| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:34.01 | BAD Outdoor LC Invitational | 2025-06-20 |
| 100m Backstroke | 1:25.48 | 2025 HAC Steeltown Invitational | 2025-11-28 |
| 100m Breaststroke | 1:27.18 | 2025 HAC Steeltown Invitational | 2025-11-28 |
| 100m Butterfly | 1:27.87 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 100m Freestyle | 1:15.99 | BAD Outdoor LC Invitational | 2025-06-20 |
| 100m Freestyle | 1:06.91 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 200m Backstroke | 3:06.09 | 2026 MMST GTA Skins | 2026-02-13 |
| 200m Breaststroke | 3:15.81 | 2026 MMST GTA Skins | 2026-02-13 |
| 200m Butterfly | 3:17.13 | 2025 MSSAC Open | 2025-12-19 |
| 200m Freestyle | 2:32.60 | 2026 MMST GTA Skins | 2026-02-13 |
| 200m Freestyle | 2:31.48 | 2025 MSSAC Open | 2025-12-19 |
| 200m IM | 2:57.67 | MAC Winter Invitational | 2026-01-22 |
| 200m IM | 2:55.40 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 400m Freestyle | 5:28.21 | 2026 MMST GTA Skins | 2026-02-13 |
| 400m Freestyle | 5:32.00 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 400m IM | 6:18.95 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 50m Backstroke | 39.17 | 2026 MMST GTA Skins | 2026-02-13 |
| 50m Backstroke | 40.21 | Hall of Fame | 2025-10-18 |
| 50m Breaststroke | 43.45 | BAD Outdoor LC Invitational | 2025-06-20 |
| 50m Breaststroke | 38.13 | 2026 Joanne Malar Invitational | 2026-01-16 |
| 50m Butterfly | 36.05 | 2026 MMST GTA Skins | 2026-02-13 |
| 50m Butterfly | 41.30 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 50m Freestyle | 29.86 | 2026 MMST GTA Skins | 2026-02-13 |
| 50m Freestyle | 29.73 | 2025 MSSAC Open | 2025-12-19 |
| 800m Freestyle | 11:29.92 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
Costanzo, Viggo's top personal bests include 100m Backstroke (1:34.01), 100m Backstroke (1:25.48), 100m Breaststroke (1:27.18), 100m Butterfly (1:27.87), 100m Freestyle (1:15.99).
Costanzo, Viggo swims for Hamilton Aquatic Club.
Costanzo, Viggo has competed in 8 meets.