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On August 29, 1991, the Edwards Underground Water District (EUWD) received a completed application form from the City of Cibolo requesting a leak detection/location survey on its water distribution system. A pre-survey conference was held October 19, 1993 at the City of Cibolo City Hall to discuss the work to be performed. It was agreed that EUWD would perform sonic leak detection on all available access points, computerized leak location as needed, record any unusual system conditions found, and submit to the City a revised master water plat with the final report.

John E. Gapinski of EUWD began the survey on November 2, 1993, and the survey was concluded on December 2, 1993. Over the course of the survey, EUWD staff surveyed a total of 985 access points including 639 customer service connections, 88 fire hydrants, 241 main line valves, and 17 other access points covering 15.52 miles of distribution mains. Computer leak sound correlation was performed on two locations.

EUWD technicians detected a total of 22 leaks. This total included 1 meter box leak, 2 fire hydrant leaks, 3 service line leaks, 3 valve leaks, and 13 customer side leaks. EUWD staff estimates 38,483 gallons of water per day has been saved by the repair of 6 detected leaks as of December 17, 1993. The leaks discovered during the survey range from 36,720 gallons per day to numerous small customer side leaks.

As part of the survey, EUWD staff located 72 main line valves, 14 blow-off valves, 27 fire hydrants, 225 services, and 3.66 miles of distribution main not shown on the master water plats. EUWD staff was unable to locate 14 main line valves, 2 services, and 2 fire hydrants. An additional 22 valve stacks need cleaning and/or repair. EUWD noted 3 meter boxes and 3 valve boxes needing lid replacement.