Watford Swimming Club's Erin O'Meara took six medals home from East Region Championships.
O'Meara, 10, took gold in the 200m breaststroke, silver in the 200m individual medley and 100m breaststroke and bronze in the 100m, 200m and 400m freestyle events.
Twelve-year-old Marcus Kemp took fourth place and achieved National qualifying times in the 100m and 200m breaststroke events.
Meanwhile, Oliver Taverner, 13, reached five finals, finishing in fourth, fifth and six as well as gaining another two National qualifying times.
Both Kemp and Taverner are now focused on the British Gas ASA National Championships 2014 which take place in Sheffield from July 30 to August 3.
The club also climbed to second in Hertfordshire Peanuts Swimming League after winning the second round of the competition and hosted a successful Alternative Nationals Open Meet.