| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:13.34 | Scar Pan Am Winter Classic | 2026-01-16 |
| 100m Backstroke | 1:11.32 | Pan Am Open 2026 | 2026-02-21 |
| 100m Breaststroke | 1:34.76 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 100m Breaststroke | 1:23.99 | 2025 NYAC Cup | 2025-11-14 |
| 100m Butterfly | 1:23.52 | PICK Last Gasp 2025 | 2025-06-07 |
| 100m Freestyle | 1:02.18 | Scar Pan Am Winter Classic | 2026-01-16 |
| 100m Freestyle | 1:01.59 | Pan Am Open 2026 | 2026-02-21 |
| 100m IM | 1:12.97 | Pan Am Open 2026 | 2026-02-21 |
| 200m Backstroke | 2:55.75 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 200m Backstroke | 2:33.93 | Pan Am Open 2026 | 2026-02-21 |
| 200m Freestyle | 2:38.98 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 200m Freestyle | 2:16.61 | Pan Am Open 2026 | 2026-02-21 |
| 200m IM | 2:43.58 | Scar Pan Am Winter Classic | 2026-01-16 |
| 200m IM | 2:43.01 | 2025 NYAC Cup | 2025-11-14 |
| 400m Freestyle | 5:12.77 | Scar Pan Am Winter Classic | 2026-01-16 |
| 400m Freestyle | 5:39.97 | PICK Last Gasp 2025 | 2025-06-07 |
| 400m IM | 6:01.70 | Scar Pan Am Winter Classic | 2026-01-16 |
| 50m Backstroke | 33.83 | Scar Pan Am Winter Classic | 2026-01-16 |
| 50m Backstroke | 32.89 | 2025 Murray Drudge Invitational | 2025-12-05 |
| 50m Breaststroke | 40.69 | Scar Pan Am Winter Classic | 2026-01-16 |
| 50m Breaststroke | 38.12 | MAC Fall Fest Invitational | 2025-10-18 |
| 50m Butterfly | 32.30 | Scar Pan Am Winter Classic | 2026-01-16 |
| 50m Butterfly | 33.18 | MAC Fall Fest Invitational | 2025-10-18 |
| 50m Freestyle | 28.27 | Scar Pan Am Winter Classic | 2026-01-16 |
| 50m Freestyle | 27.79 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
McLoughlin, William's top personal bests include 100m Backstroke (1:13.34), 100m Backstroke (1:11.32), 100m Breaststroke (1:34.76), 100m Breaststroke (1:23.99), 100m Butterfly (1:23.52).
McLoughlin, William swims for Ajax Aquatic Club.
McLoughlin, William has competed in 8 meets.