| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:09.08 | GHAC Winter Invitational SCM | 2026-03-06 |
| 100m Breaststroke | 1:40.72 | Friday Night Races #1 | 2025-11-07 |
| 100m Butterfly | 1:05.24 | GHAC Winter Invitational SCM | 2026-03-06 |
| 100m Freestyle | 1:02.66 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 200m Butterfly | 2:32.55 | GHAC Winter Invitational SCM | 2026-03-06 |
| 200m Freestyle | 2:22.81 | Border City Invitational 2025 | 2025-12-05 |
| 200m IM | 2:50.76 | Otters Spooky Splash 2025 | 2025-10-24 |
| 25m Butterfly | 13.52 | Friday Night at the Races #3 | 2026-03-13 |
| 400m Freestyle | 5:22.48 | Otters Spooky Splash 2025 | 2025-10-24 |
| 400m IM | 5:42.69 | Friday Night at the Races #3 | 2026-03-13 |
| 50m Backstroke | 34.98 | OSAC Team Challenge Short Course Swim Meet | 2025-11-14 |
| 50m Butterfly | 29.83 | Border City Invitational 2025 | 2025-12-05 |
| 50m Freestyle | 28.76 | Border City Invitational 2025 | 2025-12-05 |
Foster, Marshall's top personal bests include 100m Backstroke (1:09.08), 100m Breaststroke (1:40.72), 100m Butterfly (1:05.24), 100m Freestyle (1:02.66), 200m Butterfly (2:32.55).
Foster, Marshall swims for Halton Hills Blue Fins.
Foster, Marshall has competed in 13 meets.