Schwartz is listed among the top water polo referees in the European Aquatics officials registry for the 2025–2026 season, representing Israel in the A category of international referees.[5] He has been appointed to officiate at key events including European Water Polo Championship matches.[6]
In 2025, Schwartz served as a neutral referee at the World Aquatics U20 Water Polo Championships in Zagreb, officiating matches for teams from multiple continents.[7] He was also named as a referee for World Aquatics World Cup 2025 Division 1 women's matches in Alexandroupolis, reflecting his activity across elite international fixtures.[8]
Schwartz has officiated in club and continental tournaments, including assignments in the European Champions League and Euro Cup fixtures.[9] Additionally, he has served in VAR and on‑field referee roles in high‑profile matches such as the final four of the Women's Champions League.[10][11][12]
He served as a neutral referee at the World Aquatics U20 Water Polo Championships in Zagreb 2025.[13] In January 2026, he officiated the bronze-medal game between Greece and Italy at the 2026 Men's European Water Polo Championship held in Belgrade.[14]