| Personal Details | |
| Name | Efa Thomas-owen |
| Known As | Efa |
| Year of Birth | 2012 |
| Eligibility Category | Female |
| Membership Details | |||
| Member Number | 1452990 | ||
| Member Status | Current | ||
| Ranked Club | Clwb Nofio Caernarfon | ||
| Country of International Representation | Wales | ||
| Membership Categories |
| SW Competitive |
| Clubs & Organisations | |
| Club | Ranked |
| Clwb Nofio Caernarfon | Yes |
| Nofio Gwynedd Performance | |
| Click For Personal Best | 2024 Short Course | Short Course PB | 2024 Long Course | Long Course PB |
| 50m Freestyle | . | 31.95 | 32.69 | 32.69 |
| 100m Freestyle | 1:08.84 | 1:08.84 | 1:09.72 | 1:09.72 |
| 200m Freestyle | . | 2:29.95 | 2:36.74 | 2:36.74 |
| 400m Freestyle | . | 5:24.51 | 5:35.97 | 5:35.97 |
| 800m Freestyle | . | . | . | . |
| 1500m Freestyle | . | . | . | . |
| 50m Breaststroke | 46.44 | 46.36 | . | 55.11 |
| 100m Breaststroke | . | 1:42.40 | . | . |
| 200m Breaststroke | . | . | . | . |
| 50m Butterfly | . | 35.64 | 35.88 | 35.88 |
| 100m Butterfly | . | 1:16.79 | 1:23.64 | 1:23.64 |
| 200m Butterfly | . | 2:56.23 | . | 3:41.44 |
| 50m Backstroke | . | 38.32 | 37.28 | 37.28 |
| 100m Backstroke | 1:19.44 | 1:19.44 | 1:23.33 | 1:23.33 |
| 200m Backstroke | . | 2:48.71 | 2:55.61 | 2:55.61 |
| 200m Individual Medley | 2:55.33 | 2:51.16 | 3:02.78 | 3:02.78 |
| 400m Individual Medley | . | . | . | . |
| 100m Individual Medley | . | 2:07.54 | . | . |
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