CorGal® is an acronym used to describe corrugated and galvanized steel. CorGal is a registered trademark of Water Storage Tanks, Inc., the manufacturer of CorGal tanks.

The CorGal tank was developed to provide a non-corrosive storage vessel for the liquid containment industry.  Our tanks are popular and diverse with solutions for rainwater harvesting, stormwater management, fire protection, irrigation, agricultural, industrial, mining, potable drinking water and many other applications.

CorGal Tanks can be built on site in a timely manner at a fraction of the cost of conventional bolt-up or welded steel tanks, plus they can be erected on difficult to access project sites. The tanks may also be disassembled and relocated if necessary.

CorGal Tank sizes range from 6 ft. to 120 ft. in diameter with a roof, and up to 200 feet in diameter as an open top tank. The tank with roof capacities range from 700 gallons to 500,000 gallons while the open top tanks can be built with even larger capacities.


Tank Shell

The CorGal structure consists of corrugated and galvanized steel panels which are bolted together at a project site. The wall sheets are curved for the specified tank radius and punched for connections to adjoining wall sheets. The roof panels are formed and punched to be bolted together to create a shell structure roof system.


A geotextile preliner is installed inside the tank structure walls and onto the tank foundation. This preliner serves to protect the main water containment liner from damage and also to wick moisture away from the interior of the tank walls.

Flexible Membrane Liner

A factory-welded-seam, flexible membrane liner is then suspended inside of the tank structure eave for water containment.  There are many grades of liners available including NSF-61 certification for potable water storage.

Flanges & Connections

Connections of piping to the tank structure and liners is accomplished by the installation of penetration flange sets. The outer penetration flange attaches to the structure or foundation and is sealed to the exterior or interior piping. The interior seal flange bolts through the liner and into the outer penetration flange to make the connection watertight.


Tank structures are anchored to the concrete foundation with a specialized wall anchor.  These anchors are available in standard, heavy duty, and seismic grades depending on the location of the water tank and specific requirements to meet local codes.