| Name | Time | Date | Meet |
|---|---|---|---|
| Amanda Croix | 49.35 | March 20, 2010 | 2010 NCAA Division III Championships |
| Amanda Croix | 49.88 | Feb. 20, 2010 | College Conference of Illinois & Wisconsin Championships |
| Amanda Croix | 50.29 | March 21, 2009 | 2009 NCAA Division III Championships |
| Amanda Croix | 51.14 | Feb. 21, 2009 | 2009 CCIW Championships |
| Amanda Croix | 51.63 | March 15, 2008 | 2008 NCAA Division III Womens Championship |
| Amanda Croix | 52.29 | Feb. 16, 2008 | 2008 CCIW Championships |
| Amanda Croix | 53.82 | Nov. 30, 2007 | 2007 TYR/CollegeSwimming.com Classic |
| Tricia Biedron | 54.17 | Feb. 15, 2003 | CCIW Swimming Championships |
| Janet Hughes | 55.79 | Feb. 16, 2002 | 2002 CCIW Championships |
