Water systems relying on a single storage tank often experience operational difficulty removing the tank from service for inspection. Standard inspection, disinfection and sampling requirements usually result in a tank being out of service for a minimum of 4 days. During that time, single tank systems must operate with constant pumping and pressure relief valves. This wastes power and water along with significantly reducing fire fighting capacity. For these reasons underwater inspections which require the tank to be out of service for only a few hours are often preferred.

Dixon has completed hundreds of underwater storage tank inspections. All inspections are done by full time Dixon engineers and inspectors. Preliminary structural inspection, maintenance inspection, and warranty inspection reports with color photos are provided in the same format and detail as for our drained inspections. In addition to the diver's inspection, on reservoirs and storage tanks with extensive roof structures, an inflatable raft is used to closely examine these areas.

All Dixon underwater and float inspection equipment is dedicated for potable water use only. All equipment is chlorinated prior to tank entry, and chlorine residuals are monitored before and after the inspection.