The Fourth National Field Event of the workers in the Water Supply and Drainage System sector was held on 12 to 16 of September, 2007 in seaside resort �Albena�. More than 750 people from 34 Unions took part in the sport competitions, participating in 8 kinds of sports. The Field Event was opened by Mr. Angel Prestoiski, President of the Union of the employers in the Water Supply and Drainage System sector in Bulgaria. Official guests at the event were Mrs. Treperushka Mladenova, President of the National Trade Union �Water Supply� CITUB, who read a congratulatory letter from Dr. Zhelyazko Hristov, Assoc.Prof., President of CITUB, Mr. Yoanis Parteniotis, President of the federation �Building, Industry and Water Supply� Podkrepa , as well as many directors of Unions in the Water Supply and Drainage System sector from all the country. 
The first place in the complex ranking was taken by Water Supply and Drainage System Varna, followed by Water Supply and Drainage System Vratsa and Water Supply and Drainage System Stara Zagora.