| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:16.11 | UCSC Spring Start-up | 2026-04-25 |
| 100m Backstroke | 1:15.12 | 2025 PCS Xmas Cracker | 2025-12-05 |
| 100m Butterfly | 1:18.83 | Summer Provincial Championships LC | 2025-07-24 |
| 100m Freestyle | 1:03.58 | Western Transmountain Festival III | 2026-02-20 |
| 100m Freestyle | 1:01.56 | Winter Provincial Trials | 2026-03-06 |
| 100m IM | 1:14.80 | UCSC TC1-Special | 2025-10-17 |
| 200m Backstroke | 2:47.83 | Summer Provincial Trials LC | 2025-06-27 |
| 200m Backstroke | 2:44.17 | UCSC Grand Prix | 2026-01-30 |
| 200m Freestyle | 2:18.11 | Western Transmountain Festival III | 2026-02-20 |
| 200m Freestyle | 2:15.23 | Winter Provincial Trials | 2026-03-06 |
| 200m IM | 2:43.73 | UCSC Spring Start-up | 2026-04-25 |
| 200m IM | 2:42.06 | Cascade Speed Meet 2025 Provincial Series #1 | 2025-11-08 |
| 400m Freestyle | 4:57.89 | Summer Provincial Championships LC | 2025-07-24 |
| 400m Freestyle | 4:47.20 | Winter Provincial Trials | 2026-03-06 |
| 400m IM | 5:46.00 | Cascade Speed Meet 2025 Provincial Series #1 | 2025-11-08 |
| 50m Backstroke | 35.36 | Winter Provincial Trials | 2026-03-06 |
| 50m Breaststroke | 40.89 | UCSC Spring Start-up | 2026-04-25 |
| 50m Breaststroke | 41.17 | 2025 PCS Xmas Cracker | 2025-12-05 |
| 50m Butterfly | 33.72 | UCSC Spring Start-up | 2026-04-25 |
| 50m Butterfly | 33.64 | UCSC Grand Prix | 2026-01-30 |
| 50m Freestyle | 29.65 | Summer Provincial Trials LC | 2025-06-27 |
| 50m Freestyle | 28.94 | Winter Provincial Trials | 2026-03-06 |
| 800m Freestyle | 10:31.90 | Summer Provincial Trials LC | 2025-06-27 |
| 800m Freestyle | 9:49.36 | Winter Provincial Trials | 2026-03-06 |
Kostka, Natalie's top personal bests include 100m Backstroke (1:16.11), 100m Backstroke (1:15.12), 100m Butterfly (1:18.83), 100m Freestyle (1:03.58), 100m Freestyle (1:01.56).
Kostka, Natalie swims for Calgary Swimming.
Kostka, Natalie has competed in 10 meets.