| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:27.85 | 2025 Stingrays' Annual Winter Break Invitational | 2025-12-12 |
| 100m Breaststroke | 1:42.10 | 2026 Stingrays Annual Spring Break Invitational | 2026-03-06 |
| 100m Freestyle | 1:10.50 | 2026 Stingrays Annual Spring Break Invitational | 2026-03-06 |
| 200m Backstroke | 3:02.52 | 2026 Stingrays Annual Spring Break Invitational | 2026-03-06 |
| 200m Butterfly | 3:07.08 | 2026 Stingrays Annual Spring Break Invitational | 2026-03-06 |
| 200m Freestyle | 2:37.06 | 2026 Stingrays Annual Spring Break Invitational | 2026-03-06 |
| 200m IM | 3:03.70 | 2025 Stingrays' Annual Winter Break Invitational | 2025-12-12 |
| 400m Freestyle | 5:29.67 | 2026 Stingrays Annual Spring Break Invitational | 2026-03-06 |
| 50m Butterfly | 43.12 | 2025 Stingrays' Annual June Jamboree | 2025-06-13 |
| 50m Freestyle | 33.13 | 2025 Stingrays' Annual Winter Break Invitational | 2025-12-12 |
| 800m Freestyle | 11:28.32 | 2025 Stingrays' Annual June Jamboree | 2025-06-13 |
Lempinen, Ethan's top personal bests include 100m Backstroke (1:27.85), 100m Breaststroke (1:42.10), 100m Freestyle (1:10.50), 200m Backstroke (3:02.52), 200m Butterfly (3:07.08).
Lempinen, Ethan swims for Duncan Swim Team.
Lempinen, Ethan has competed in 4 meets.