| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:18.72 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 100m Breaststroke | 1:42.39 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 100m Butterfly | 1:18.93 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 100m Freestyle | 1:09.47 | 2025 Age Group International SC | 2025-11-27 |
| 200m Backstroke | 2:52.38 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 200m Freestyle | 2:29.87 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 200m IM | 2:59.12 | ESWIM January Time Trial | 2026-01-20 |
| 400m Freestyle | 5:37.78 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 400m IM | 6:38.33 | ESWIM 400 Time Trial | 2025-12-16 |
| 50m Backstroke | 36.02 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 50m Breaststroke | 44.74 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 50m Butterfly | 34.01 | 2025 Age Group International SC | 2025-11-27 |
| 50m Freestyle | 29.54 | 2025 Age Group International SC | 2025-11-27 |
| 800m Freestyle | 12:36.72 | ESWIM Distance Time Trial | 2025-11-11 |
Lachance, Olivia's top personal bests include 100m Backstroke (1:18.72), 100m Breaststroke (1:42.39), 100m Butterfly (1:18.93), 100m Freestyle (1:09.47), 200m Backstroke (2:52.38).
Lachance, Olivia swims for Etobicoke Swim Club.
Lachance, Olivia has competed in 13 meets.