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On October 5, 1992, the Edwards Underground Water District (EUWD) received a completed application form from the City of Uvalde requesting a leak detection/location survey on its water distribution system. A pre-survey conference was held October 22, 1992 at the City of Uvalde 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.

Mark L. McGinnis of EUWD began the survey on January 11, 1993, and the survey was concluded on April 26, 1993. Over the course of the survey, EUWD surveyed a total of 6,345 access points including 5,091 customer service connections, 361 fire hydrants, 884 main line valves, and 9 other access points covering 89.89 miles of distribution mains.

Computer leak sound correlation was performed on 2 locations. EUWD technicians detected a total of 362 leaks. This total included 30 meter box leaks, 9 fire hydrant leaks, 9 service line leaks, 3 main leaks, 2 valve leaks, and 309 customer side leaks. EUWD estimates 17,525 gallons of water per day has been saved by the repair of 45 detected leaks as of April 26, 1993. The leaks discovered during the survey range from 2,160 gallons per day to numerous small meter box leaks.

As part of the survey, EUWD located 173 main line valves, 33 fire hydrants, and 20.2 miles of distribution main not shown on the master water plats. EUWD staff was unable to locate 97 main line valves and 17 customer service connections. An additional 112 valve stacks need cleaning and/or repair. EUWD noted 100 water meters that were not registering accurately.