Since 1953, CROM has designed and built over 4300 prestressed concrete tanks with capacities ranging from 35,000 to over 30,000,000 gallons. CROM adheres to the highest standards of professional engineering and construction including AWWA D110 and ACI 350 standards. As long-term active and contributing members of both design committees, CROM remains a leader in the water and wastewater industry. All CROM design drawings and calculations are signed and sealed by one of our company’s full-time registered professional engineers. 

Please Note: All engineering services are performed by CROM, LLC.


Prestressed concrete tanks (PCTs) are the highest quality and most durable solution in potable water containment. CROM PCTs are constructed to AWWA D110 standards and are custom designed and built to site specific needs. 

Lighthouse TANK

Located 25 feet from the Gulf of Mexico, on a U.S Government port, and neighboring a Grand Casino, the “Lighthouse Tank” is a very stout CROM design. This 250,000-gallon water storage tank was designed and constructed to withstand Category 5 Hurricane winds and wave action of 15 feet. The structural, pile-supported, floor is designed to prevent uplift and/or overturning during major Hurricane events. The LED “light” system is completely functional. The flared base of the tank is constructed of highly reinforced shotcrete, as is the frame around the painted nautical flags- which spell out GULFPORT.

Blast-proof water supply

Due to the importance of Critical Infrastructure, CROM developed blast-proof designs and construction techniques to keep water storage infrastructure functional during blasts, tornadic conditions, and seismic activity.


The installation of a natural draft tray aerator will aid in the removal of many unwanted contaminants. CROM fiberglass aerators are attractive, efficient and constructed with NSF approved materials. For additional protection of the tank interior subject to aggressive contaminants, CROM developed self-washing flat concrete covers and embedded HDPE liners in free-span concrete domes. 


Prestressed Concrete EQ tanks are a preferred, cost effective solution to contain large volumes of wastewater for Flow Equalization or Wet Weather Storage. EQ tanks are frequently designed to accommodate peak flow conditions thereby providing steady inflow to the treatment plant preventing combined sewer overflow (CSO) and sanitary sewer overflow (SSO) events.

Fire protection

Fire suppression is sometimes required for residential, urban, and commercial use, especially in locations where the municipal water supply is low. CROM water storage tanks for fire protection can assure compliance with NFPA, international, federal, state, and local fire codes.


CROM provides turn-key services for the design and construction of the PCT and internal-patented diffuser system for Thermal Energy Storage Tanks (TES).  The combination of the low maintenance PCT and corrosion resistant internal diffuser system ensures many decades of uninterrupted service and very low life-cycle costs. For decades, clients across the commercial, institutional, and industrial industries have valued the benefits of CROM TES tanks.  

Turbine inlet air chilling (TIAC)

The process of cooling a combustion turbine’s inlet air is known as Turbine Inlet Air Chilling (TIAC). Many power generation facilities are comprised of turbines which are fueled by natural gas. These facilities have periods where demand can increase, especially during hot summer days, when most are heavily utilizing air conditioning systems. This in turn puts a strain on the electric grid. At the same time that the grid is being strained, less dense hot ambient air causes combustion turbines at generation facilities to be less efficient producing less MW power. By employing a TIAC system, power producers can eliminate the effects of hot ambient air and increase the total amount of power the facility is supplying to the grid. This will assist in reducing on-peak energy consumption, lowering energy costs, and adding additional power to the electrical grid.


With over 67 years of experience, CROM understands the complex needs and requirements of wastewater treatment. CROM designs and constructs solutions for all physical infrastructure needs in the wastewater industry. Wastewater poses a high threat to concrete structures and thus these structures must be designed, constructed, and protected from potential degrading conditions. Prestressed tanks in wastewater treatment plants include equalization tanks, sludge digesters, process water tanks, effluent storage tanks, clarifiers, aeration tanks, sequencing batch reactor (SBR) tanks, bilge storage tanks and package treatment tanks. 


Prestressed concrete tanks can be used for reclaimed and reuse wastewater. These tanks may be located at the treatment plant facility, or on golf courses and agricultural lands where the treated water is used for irrigation purposes. In Florida, recycling water on site or nearby, reduces energy needed to move water long distances or pumping water from within an aquifer. This water can also be used as make-up water for chillers in high-cooling environments such as data centers. These are cost effective solutions to the water treatment process.


CROM prestressed concrete tanks can be designed to accommodate various types of clarifier mechanisms. Operating on the principle of gravity settling, clarifiers have been used to treat wastewater for decades and provide efficient solutions to process and purify wastewater.


CROM is experienced in the design and construction of digesters in many different configurations and sizes, including open-top aerobic digesters and pressurized anaerobic digesters. Prestressed concrete tanks can be designed to accommodate the requirements and demands of sludge digestion and storage. Prestressing wires can be placed to accommodate multiple wall pipe penetrations. Anaerobic digesters may be built with free-span prestressed concrete domes or designed to accommodate fixed or floating steel covers, aluminum domes, or membrane covers. Digesters can be designed and constructed for both mesophilic (90 degrees Fahrenheit) and thermophilic (140 degrees Fahrenheit) operation by applying insulation to the exterior of the tanks. CROM has also designed and built several unconventional structures including two-3 million gallon prestressed concrete egg-shaped digesters.


The digester’s smaller diameter and high sidewall along with the steeply sloped floors and/or cone-shaped concrete domes make “Modified Egg-Shaped digesters” well suited for the design and construction methods CROM uses. This type of digester minimizes dead zones at the floor/wall and roof/wall intersections, minimizing sludge build-up and down-time for clean-out maintenance. The construction of these digesters has proven to be much more economical than traditional egg-shaped digesters.


Oxidation ditch treatment systems typically consist of single or multi-channel configurations with a ring, oval, or horseshoe-shaped basins. The structures are designed and constructed in accordance with the applicable portions of AWWA Standard D110 using the Type II wall configuration – shotcrete with an embedded steel diaphragm. As a result, these tanks are known for their outstanding concrete crack control, watertightness, appearance, longevity and minimal maintenance requirements.

Sequencing Batch Reactor (SBR)

Sequencing Batch Reactor tanks and Biological Nutrient Removal (BNR) tanks are essentially one in the same.  The AWWA D110 type II walls of the tank are designed to withstand the pressure of the water pushing against it.

secondary containment

The Unites States Environmental Protection Agency (EPA) has established governing rules to prevent harmful discharges into navigable waters of the US and adjoining shorelines. Secondary containment has proven to provide an essential line of defense in the case of primary containment failure. 

Spent deicing fluid storage

A trend in transportation, especially airports, is establishing well-designed centralized deicing facilities that help process excess glycol in a more sustainable manner. The pre-treatment of spent deicing fluid is important as to not upset the WWTF where the fluid is discharged to.