| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:08.61 | 2025 LC Far Western Championship | 2025-07-31 |
| 100m Butterfly | 1:05.76 | 2025 LC Far Western Championship | 2025-07-31 |
| 100m Freestyle | 1:01.45 | 2025 LC Far Western Championship | 2025-07-31 |
| 200m Backstroke | 2:32.23 | 2025 LC Far Western Championship | 2025-07-31 |
| 200m Freestyle | 2:17.75 | 2025 LC Far Western Championship | 2025-07-31 |
| 50m Backstroke | 32.61 | 2025 LC Far Western Championship | 2025-07-31 |
| 50m Butterfly | 29.39 | 2025 LC Far Western Championship | 2025-07-31 |
Johnston, Samantha's top personal bests include 100m Backstroke (1:08.61), 100m Butterfly (1:05.76), 100m Freestyle (1:01.45), 200m Backstroke (2:32.23), 200m Freestyle (2:17.75).
Johnston, Samantha swims for Crawfish Aquatics.
Johnston, Samantha has competed in 1 meets.