| Final | Team | time | L | | 1. Terri Lee-Stickles | USA | 1:02.8 | 5 | | 2. Mary Stewart | CAN | 1:03.3 | 4 | | 3. Kathleen Ellis | USA | 1:03.5 | 6 | | 4. Madelaine Sevigny | CAN | 1:06.2 | 7 | | 5. Ann Lallance | PUR | 1:08.2 | 3 | | 6. Maria Louisa Sousa | MEX | 1:09.2 | 8 | | -. Maria de Lurdes Teixeira | BRA | | 2 | | -. Angela Maria Paioli | BRA | | 9 |
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| Heat 1 | Team | time | Rk. | | 1. Kathleen Ellis | USA | 1:03.8 | 2. | | 2. Mary Stewart | CAN | 1:04.6 | 3. | | 3. Maria Louisa Sousa | MEX | 1:09.1 | 6. | | 4. Angela Maria Paioli | BRA | 1:09.6 | 8. | | 5. Lilliana Hasembein | ARG | 1:10.1 | 10. | | 6. Alda Balbuena | PER | 1:15.5 | 13. |
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| Heat 2 | Team | time | Rk. | | 1. Terri Lee-Stickles | USA | 1:03.3 | 1. | | 2. Madelaine Sevigny | CAN | 1:05.9 | 4. | | 3. Ann Lallance | PUR | 1:08.7 | 5. | | 4. Maria de Lurdes Teixeira | BRA | 1:09.2 | 7. | | 5. Susana Peper | ARG | 1:09.- | 9. | | 6. Laura Varella | VEN | 1:11.8 | 11. | | 7. Maria Rosario Vivanco | PER | 1:12.9 | 12. |
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