After a week-long test event - the first of any Olympic sport to get under way ahead of the showpiece in two years' time - ISAF head of competitions Alastair Fox admitted that while improvements have been noticeable at the Guanabara Bay course, he has yet to be entirely convinced over water quality.
While many competitors were impressed with one of the Games' most criticised venues, reports suggest that the course remains littered with debris, with dead animals pictured last month among the objects floating in the bay.
And while Fox insisted that the test event should ultimately be considered a success, he has urged the International Olympic Committee (IOC) to continue working towards improvements.
"Before the test event the ISAF was very concerned about pollution inside the bay and outside the bay," he told insidethegames.
"At the start of the event, Rio 2016 carried out water quality tests across the field of play and the results showed that the water quality met Brazilian and international water quality standards.
"Having been there, we believe the course areas outside the bay are good but we need to ensure that there are no objects in the water that could affect racing.
"Inside the bay we are still concerned about the water quality levels but it is clear that the water quality inside the bay has improved over the last four years.
"There are still concerns about the number of objects in the water inside the bay and we will work closely with the IOC and Rio 2016 to ensure everything is done to ensure the water quality is improved and that we have a clean field of play."
The Aquece Rio International Sailing Regatta will be followed by a further 44 test events held until May 2016 across Olympic and Paralympic sports, aimed at fine-tuning preparations for the Games proper.
