| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:14.83 | 2026 AAA #1 LC Invitational | 2026-01-30 |
| 100m Backstroke | 1:09.43 | 2025 Candy Cane Invitational | 2025-12-12 |
| 100m Butterfly | 1:08.46 | East Coast Championships | 2025-07-10 |
| 100m Butterfly | 1:04.86 | 2026 AA & AAA Winter Champs | 2026-03-05 |
| 100m Freestyle | 1:03.13 | East Coast Championships | 2025-07-10 |
| 100m Freestyle | 59.43 | 2026 AA & AAA Winter Champs | 2026-03-05 |
| 100m IM | 1:13.62 | 2025 DAL Sprint Meet | 2025-10-19 |
| 200m Backstroke | 2:41.98 | 2026 AAA #1 LC Invitational | 2026-01-30 |
| 200m Backstroke | 2:43.14 | 2025 AGD Distance Central | 2025-11-01 |
| 200m Freestyle | 2:16.46 | East Coast Championships | 2025-07-10 |
| 200m Freestyle | 2:07.34 | 2026 AA & AAA Winter Champs | 2026-03-05 |
| 200m IM | 2:37.08 | 2026 AAA #1 LC Invitational | 2026-01-30 |
| 400m Freestyle | 4:44.90 | 2026 AAA #1 LC Invitational | 2026-01-30 |
| 400m Freestyle | 4:37.40 | 2025 NYAC Cup | 2025-11-14 |
| 50m Backstroke | 34.37 | 2026 AAA #1 LC Invitational | 2026-01-30 |
| 50m Backstroke | 34.35 | 2025 DAL Sprint Meet | 2025-10-19 |
| 50m Breaststroke | 41.55 | 2025 DAL Sprint Meet | 2025-10-19 |
| 50m Butterfly | 31.28 | East Coast Championships | 2025-07-10 |
| 50m Butterfly | 29.55 | 2026 AA & AAA Winter Champs | 2026-03-05 |
| 50m Freestyle | 28.99 | 2026 HTAC Time Trial #1 | 2026-04-11 |
| 50m Freestyle | 27.88 | 2026 AA & AAA Winter Champs | 2026-03-05 |
| 800m Freestyle | 10:11.96 | 2026 AAA #1 LC Invitational | 2026-01-30 |
| 800m Freestyle | 10:09.99 | 2025 AGD Distance Central | 2025-11-01 |
Johnson, Mya's top personal bests include 100m Backstroke (1:14.83), 100m Backstroke (1:09.43), 100m Butterfly (1:08.46), 100m Butterfly (1:04.86), 100m Freestyle (1:03.13).
Johnson, Mya swims for Halifax Trojan Aquatic Club.
Johnson, Mya has competed in 11 meets.