| Lane | Team | Squad | Seed | Note |
|---|---|---|---|---|
| 3 | Addison Trail | A | NT | |
| 4 | Trinity (River Forest) | A | 1:08.00 | |
| 5 | Franklin Park-Northlake (Leyden) | A | NT |
| Lane | Team | Squad | Seed | Note |
|---|---|---|---|---|
| 1 | Glenbard South | A | 58.25 | |
| 2 | Willowbrook | A | 57.20 | |
| 3 | Hersey | A | 52.84 | |
| 4 | Harvey (Thornton) | A | 49.71 | |
| 5 | Loyola Academy | A | 52.00 | |
| 6 | Schaumburg | A | 54.71 | |
| 7 | Chicago (Solorio Academy) | A | 58.02 |