Margeta has built an extensive international career, officiating at every Summer Olympics between 2000 and 2024, with the exception of the Tokyo 2020 Games, which he missed due to a family illness. Over the years, he has also taken charge of matches at numerous FINA World Championships, World Cups, World League Super Finals, and European Championships. In July 2025, World Aquatics highlighted his long standing contribution and refereeing record. As of the 2025–2026 season, Margeta - alongside with the Greek referee
Georgios Stavridis — is widely considered one of the two top water polo referees in the world. == Other activities ==