| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:13.27 | Mies Schootman Invitational 2026 | 2026-01-16 |
| 100m Butterfly | 1:08.11 | BC Winter Divisionals - Island & Coastal Vancouver | 2026-02-20 |
| 100m Freestyle | 1:00.78 | 2026 BC Winter Provincial Championships | 2026-03-05 |
| 1500m Freestyle | 3:14.69 | Hollyburn Distance Time Trial | 2025-11-01 |
| 200m Backstroke | 2:42.10 | Hollyburn October 25 Time Trial | 2025-10-25 |
| 200m Breaststroke | 3:19.94 | Hollyburn Spring Meet | 2025-06-14 |
| 200m Butterfly | 2:39.69 | BC Winter Divisionals - Island & Coastal Vancouver | 2026-02-20 |
| 200m Freestyle | 2:09.42 | BC Winter Divisionals - Island & Coastal Vancouver | 2026-02-20 |
| 200m IM | 2:40.99 | Mies Schootman Invitational 2026 | 2026-01-16 |
| 400m Freestyle | 4:40.61 | Hollyburn February Time Trial | 2026-02-23 |
| 400m IM | 5:44.63 | Outstanding Events Time Trial | 2026-02-05 |
| 50m Backstroke | 33.52 | BC Winter Divisionals - Island & Coastal Vancouver | 2026-02-20 |
| 50m Breaststroke | 45.23 | Outstanding Events Time Trial | 2026-02-05 |
| 50m Butterfly | 30.37 | Hollyburn February Time Trial | 2026-02-23 |
| 50m Freestyle | 28.15 | 2026 BC Winter Provincial Championships | 2026-03-05 |
| 800m Freestyle | 9:58.45 | Mies Schootman Invitational 2026 | 2026-01-16 |
Johnston, Emma's top personal bests include 100m Backstroke (1:13.27), 100m Butterfly (1:08.11), 100m Freestyle (1:00.78), 1500m Freestyle (3:14.69), 200m Backstroke (2:42.10).
Johnston, Emma swims for Hollyburn Swimming.
Johnston, Emma has competed in 15 meets.