| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:03.60 | Unknown Meet 2019-07-04 | 2019-07-04 |
| 100m Backstroke | 1:01.89 | VPSC Fall Invitational 2025 | 2025-10-18 |
| 100m Breaststroke | 1:20.15 | UBC Winter Warm-Up 2026 | 2026-01-17 |
| 100m Breaststroke | 1:15.36 | Unknown Meet 2019-01-17 | 2019-01-17 |
| 100m Butterfly | 1:05.65 | UBC Winter Warm-Up 2026 | 2026-01-17 |
| 100m Freestyle | 55.35 | Unknown Meet 2023-03-31 | 2023-03-31 |
| 100m Freestyle | 53.70 | 2026 U SPORTS Swimming Championships | 2026-03-12 |
| 100m IM | 1:02.91 | UBC University Cup Pacific 2025 | 2025-11-08 |
| 1500m Freestyle | 16:28.79 | Unknown Meet 2018-08-26 | 2018-08-26 |
| 1500m Freestyle | 16:22.05 | Unknown Meet 2019-01-17 | 2019-01-17 |
| 200m Backstroke | 2:15.51 | Unknown Meet 2026-03-04 | 2026-03-04 |
| 200m Backstroke | 2:06.09 | 2026 U SPORTS Swimming Championships | 2026-03-12 |
| 200m Breaststroke | 2:42.02 | Unknown Meet 2019-01-17 | 2019-01-17 |
| 200m Freestyle | 1:57.86 | Unknown Meet 2024-05-14 | 2024-05-14 |
| 200m Freestyle | 1:54.25 | 2026 U SPORTS Swimming Championships | 2026-03-12 |
| 400m Freestyle | 4:08.11 | Unknown Meet 2019-08-23 | 2019-08-23 |
| 400m Freestyle | 4:06.02 | Import - Mississauga (ON) Dec 2019 | 2019-12-14 |
| 5000m Freestyle | 59:22.48 | Unknown Meet 2017-08-12 | 2017-08-12 |
| 50m Backstroke | 31.88 | Unknown Meet 2025-05-18 | 2025-05-18 |
| 50m Backstroke | 29.32 | Import - Mississauga (ON) Dec 2019 | 2019-12-14 |
| 50m Breaststroke | 34.38 | VPSC Fall Invitational 2025 | 2025-10-18 |
| 50m Butterfly | 28.22 | Unknown Meet 2021-12-17 | 2021-12-17 |
| 50m Freestyle | 25.97 | Sask Age Group Racing Series #3 South Div | 2026-03-07 |
| 50m Freestyle | 25.35 | UBC University Cup Pacific 2025 | 2025-11-08 |
| 800m Freestyle | 8:39.63 | Unknown Meet 2019-04-07 | 2019-04-07 |
| 800m Freestyle | 8:29.61 | Unknown Meet 2024-11-22 | 2024-11-22 |
Emma O'Croinin's top personal bests include 100m Backstroke (1:03.60), 100m Backstroke (1:01.89), 100m Breaststroke (1:20.15), 100m Breaststroke (1:15.36), 100m Butterfly (1:05.65).
Emma O'Croinin swims for University of British Columbia.
Emma O'Croinin has competed in 164 meets.