A frac tank is a portable industrial storage tank used to temporarily store liquids during oilfield, wastewater, construction, industrial, and environmental operations. In oil and gas, frac tanks are commonly used for frac water, produced water, flowback, drilling fluids, wastewater, and other jobsite fluids when the tank is appropriate for the fluid and operating conditions.
Frac tanks are part of a larger fluid management system. A complete setup may include tanks, pumps, hoses, manifolds, transfer lines, secondary containment, remote monitoring, truck loading areas, and hauling coordination. The tank holds the fluid, but the full system determines whether the operation has enough capacity, transfer speed, site access, and containment control.
WWS Tanks provides industrial and oilfield fluid storage systems, modular aboveground storage tanks, frac tanks, and temporary fluid management infrastructure. We do not drill residential water wells, install septic systems, or provide household plumbing services.
For the larger oilfield storage guide, see Industrial Frac Tank Systems & Oilfield Fluid Management Infrastructure (https://wwstanks.com/learning-center/frac-tank-systems-oilfield-fluid-management/industrial-frac-tank-systems-oilfield-fluid-management/).
For glossary reference, see Frac Tank (https://wwstanks.com/learning-center/glossary/#frac-tank).
What Is a Frac Tank?
A frac tank is a portable storage tank used to hold liquids during temporary industrial operations. The name comes from hydraulic fracturing, where tanks are often used to store water and other fluids around drilling and completions activity. Even though the term is rooted in oilfield work, frac tanks are also used in industrial wastewater storage, construction dewatering, environmental remediation, manufacturing, sludge handling, and other temporary fluid management projects.
In oilfield operations, frac tanks may be used before, during, or after hydraulic fracturing. They can help stage water before a frac job, hold flowback after stimulation, support produced water storage during production, or provide temporary liquid capacity when field conditions change.
WWS lists several tank options used in industrial and oilfield storage, including 1,000 BBL closed top frac tanks, 900 BBL open top flow back tanks, 500 BBL frac/storage tanks, and integrated remote fluid monitoring systems. WWS also provides large aboveground water storage tanks from 6,000 BBL to 81,000 BBL for high-volume storage needs.
| Common Fluid | Typical Use |
| Frac water | Staged before or during hydraulic fracturing |
| Flowback | Temporarily stored after fracturing |
| Produced water | Stored during production before transfer or hauling |
| Industrial wastewater | Held during treatment delays, maintenance, or temporary operations |
| Dewatering water | Stored during construction, excavation, or infrastructure work |
| Process water | Stored during manufacturing, cooling, cleaning, or facility operations |
A frac tank should not be selected by name alone. The right tank depends on fluid type, storage volume, transfer needs, site access, containment planning, weather exposure, and how long the system will be active.
For glossary reference, see Temporary Fluid Storage (https://wwstanks.com/learning-center/glossary/#temporary-fluid-storage).
Why Frac Tanks Are Used
Frac tanks are used because many industrial and oilfield projects need temporary liquid storage without building permanent infrastructure. A drilling program, flowback operation, treatment outage, dewatering project, maintenance shutdown, or emergency containment need may only require storage for a limited time. Renting or deploying temporary tanks can be faster and more flexible than building permanent storage.
Oilfield work is a strong example. Water demand can change with drilling schedules, completions timing, weather, hauling availability, produced water volume, and field logistics. A permanent system may not make sense for every jobsite, especially when the storage need is temporary, remote, or tied to one phase of work.
Frac tanks are also useful because they can be integrated into broader systems. A tank may be connected to pumps, transfer lines, manifolds, hauling routes, treatment equipment, monitoring systems, or modular ASTs. In that setting, the tank is not just a container. It is one part of the field’s fluid management infrastructure.
WWS states that its oil and gas systems support fracturing water storage, produced water storage, flowback containment, centralized water storage, and temporary water storage for drilling and completions. WWS also describes its modular tank solutions as a way to stage significant water volumes directly on location while reducing truck traffic and improving operational efficiency when planned correctly.
For glossary reference, see Temporary Tank System (https://wwstanks.com/learning-center/glossary/#temporary-tank-system).
For the broader storage foundation, see Industrial Fluid Storage Systems: Modular Aboveground Tank Solutions for Industrial Operations (https://wwstanks.com/learning-center/industrial-fluid-storage-systems/).
What Fluids Are Commonly Stored in Frac Tanks?
Frac tanks may store many types of industrial liquids, but not every tank is suitable for every fluid. The first step is identifying the liquid, its expected behavior, and the site conditions. Freshwater, produced water, flowback, sludge, wastewater, and process water can all create different handling, transfer, containment, and cleaning requirements.
In oil and gas, frac tanks are commonly associated with frac water, flowback, and produced water. Frac water is staged before or during hydraulic fracturing. Flowback returns to the surface after fracturing. Produced water comes to the surface during production and may require ongoing storage, transfer, hauling, recycling, treatment, or disposal depending on the operator’s plan and applicable requirements.
Outside oil and gas, frac tanks may be used for industrial wastewater, construction dewatering water, manufacturing process water, stormwater, washwater, and sludge-containing liquids. WWS states that its systems support a wide range of liquids, including wastewater, process water, stormwater, sludge, high-solids waste, and regulated fluids.
| Fluid Type | Why Storage Is Needed | Common Project Type |
| Frac water | Water must be staged before pumping | Hydraulic fracturing and completions |
| Produced water | Ongoing production fluid must be held before the next management step | Production operations |
| Flowback | Returning fluid must be contained after fracturing | Post-frac flowback operations |
| Industrial wastewater | Temporary holding may be needed before treatment or hauling | Manufacturing, food processing, wastewater projects |
| Dewatering water | Water must be held before treatment, hauling, or discharge under applicable requirements | Construction and civil projects |
| Sludge or high-solids liquids | Material may need temporary holding before hauling or treatment | Wastewater, industrial, or remediation projects |
| Process water | Water may need temporary storage during operations, maintenance, or expansion | Manufacturing, cooling, and facility support |
Storage planning should consider fluid characteristics, solids, odor, transfer rate, weather, hauling schedule, monitoring, and containment needs. A tank that is appropriate for one fluid may not be appropriate for another.
For glossary reference, see Produced Water (https://wwstanks.com/learning-center/glossary/#produced-water), Flowback (https://wwstanks.com/learning-center/glossary/#flowback), Wastewater Storage (https://wwstanks.com/learning-center/glossary/#wastewater-storage), and Frac Water Storage (https://wwstanks.com/learning-center/glossary/#frac-water-storage).
How Frac Tanks Fit Into Oilfield Operations
Frac tanks can support several stages of oilfield work. They may be used during drilling, completions, hydraulic fracturing, flowback, production, or temporary field maintenance. Their role changes depending on the fluid and the stage of the operation.
Before a frac job, storage may focus on water availability. During completions, the operation may need reliable water transfer from storage into the frac spread. After fracturing, the priority may shift to flowback containment and transfer. During production, produced water storage may become an ongoing field logistics need.
| Oilfield Stage | Storage Role | Common Tank Use |
| Drilling | Temporary field fluid storage | Drilling fluids, water, or wastewater holding |
| Completions | Water staging and operational support | Frac water storage, transfer systems |
| Hydraulic fracturing | Reliable water supply during pumping | Frac tanks, modular ASTs, manifolds, pumps |
| Flowback | Temporary containment of returning fluids | Open top flowback tanks, frac tanks, containment systems |
| Production | Ongoing produced water management | Produced water storage, tank batteries, hauling support |
| Field maintenance | Temporary holding during repairs or system changes | Frac/storage tanks, modular tanks, temporary containment |
The storage system must match the stage. A project that needs high-volume frac water staging may benefit from modular AST capacity. A localized flowback or produced water need may use different tank options. A remote production site may need more attention to trucking, access, weather, and monitoring.
For the Cluster 2 pillar, see Industrial Frac Tank Systems & Oilfield Fluid Management Infrastructure (https://wwstanks.com/learning-center/industrial-frac-tank-systems-oilfield-fluid-management/).
For glossary reference, see Produced Water Management (https://wwstanks.com/learning-center/glossary/#produced-water-management) and Flowback Water Storage (https://wwstanks.com/learning-center/glossary/#flowback-water-storage).
Open Top vs Closed Top Frac Tanks
Open top and closed top tanks serve different operational needs. The right choice depends on the fluid, access requirements, weather exposure, site conditions, transfer plan, and project duration.
WWS lists 900 BBL open top flow back tanks and 1,000 BBL closed top frac tanks among its service offerings. Those two tank types are often discussed together, but they should not be treated as interchangeable.
| Feature | Open Top Tank | Closed Top Tank |
| Typical use | Flowback or applications where top access may be needed | Temporary enclosed liquid storage |
| Exposure | Open to weather unless additional controls are used | Enclosed top helps limit exposure |
| Access | Easier top access for certain operations | Access depends on tank design and fittings |
| Common planning concerns | Weather, solids, exposure, safety, fluid type | Venting, access, transfer, compatibility, cleaning |
| Best fit | Projects where open access supports the workflow | Projects where enclosed storage is preferred |
Open top tanks may support certain flowback or field operations where access matters. Closed top tanks may be preferred when enclosed temporary storage is better for the application. The decision should always start with the fluid and site plan, not only the tank label.
Frac Tanks vs Modular Aboveground Storage Tanks
Frac tanks and modular aboveground storage tanks both support temporary fluid storage, but they are often used for different reasons. A frac tank is typically a portable tank used for temporary storage. A modular AST is a larger, scalable aboveground system that can support high-volume storage.
Neither option is automatically better. The right choice depends on volume, footprint, deployment timeline, fluid type, transfer needs, access, weather, and how long the system will be active.
| Feature | Frac Tank | Modular AST |
| Best fit | Smaller or distributed temporary storage needs | High-volume, scalable storage needs |
| Common use | Flowback, produced water, wastewater, drilling fluids, localized storage | Frac water staging, produced water storage, centralized storage |
| Capacity approach | Fixed tank sizes | Larger modular capacity options |
| Footprint | May require multiple tanks for large jobs | Can reduce footprint in some high-volume applications |
| Transfer complexity | More tanks may require more hoses and connections | May reduce manifolding in some applications |
| Deployment planning | Delivery, placement, access, and transfer setup | Site prep, setup, transfer coordination, access, and containment review |
WWS states that its aboveground storage tank systems can reduce tank footprint by as much as 50 percent and reduce truck traffic by as much as 98 percent in certain applications. The same page states that WWS AST systems are commonly used to replace frac pits, frac lakes, frac ponds, and standard tank farms using 500 BBL and 400 BBL tanks.
For large-volume water staging, a modular AST may be more efficient than using many smaller tanks. For localized or lower-volume needs, frac tanks may be the more practical option. In many projects, both may play a role within the broader fluid management plan.
For related detail, see How Modular Aboveground Storage Tanks Work in Industrial Operations (https://wwstanks.com/learning-center/how-modular-aboveground-storage-tanks-work/).
For glossary reference, see Aboveground Storage Tank (AST) (https://wwstanks.com/learning-center/glossary/#aboveground-storage-tank).
Common Mistakes When Selecting Frac Tanks
The most common mistake is choosing a tank before understanding the fluid. A buyer may ask for a frac tank without first defining whether the tank will hold freshwater, flowback, produced water, wastewater, sludge, or process water. Fluid type affects tank selection, transfer planning, access, containment, and cleaning.
The second mistake is sizing only for average volume. Oilfield and industrial projects often face peak flow, changing schedules, hauling delays, or weather interruptions. Storage should account for real operating conditions, not only normal-day assumptions.
The third mistake is ignoring transfer rate. A frac tank can have enough storage volume but still slow the project if pumps, hoses, manifolds, or loading areas are not planned correctly. Storage and transfer should be designed together.
| Mistake | Risk | Better Approach |
| Choosing by price only | Low upfront cost may create downtime or poor fit | Compare total operating impact |
| Ignoring fluid type | Wrong tank, transfer, or cleaning assumptions | Define the fluid before selecting equipment |
| Underestimating peak volume | Capacity pressure during surge conditions | Plan for peak flow and buffer capacity |
| Ignoring transfer rate | Pumping and hauling bottlenecks | Match storage with pumps, hoses, and manifolds |
| Poor site access | Truck delays or unsafe movement | Review roads, turning radius, staging, and drainage |
| Weak containment planning | Release pathways may not be controlled | Plan secondary containment before filling |
| No monitoring plan | Capacity problems may be noticed too late | Assign level monitoring and response responsibility |
For a broader rental guide, see Common Mistakes When Renting Industrial Storage Tanks (https://wwstanks.com/learning-center/common-mistakes-renting-industrial-storage-tanks/).
Beyond Oil and Gas: Other Industries That Use Frac Tanks
Although frac tanks are strongly associated with oilfield work, temporary tank systems also support many non-oilfield applications. Industrial facilities, food processors, poultry processors, dairy operations, construction contractors, environmental remediation teams, municipalities, and manufacturers may all need temporary fluid storage.
WWS describes aboveground modular water and wastewater storage systems for multiple industries, including wastewater, process water, stormwater, sludge, high-solids waste, and regulated fluids. WWS also describes industrial and manufacturing applications involving high-strength organic wastewater, rinse water, cooling water, and chemical process liquids.
In construction and civil engineering, WWS identifies storage applications such as construction-related wastewater, process and washwater, and dewatering or runoff associated with large civil projects. In food and beverage processing, WWS describes aboveground modular wastewater storage for process wastewater, washwater, high-strength organic waste, and CIP liquids.
The reason frac tanks and related temporary tank systems work across industries is simple: many operations need flexible storage for liquid they cannot immediately treat, haul, reuse, discharge, or permanently store. The fluid changes by industry, but the storage questions remain similar: What is the liquid? How much is there? How fast does it move? Where will it go next? What site risks must be managed?
For more industry context, see What Industries Use Modular Fluid Storage Systems? (https://wwstanks.com/learning-center/industries-that-use-modular-fluid-storage-systems/) and How Industrial Wastewater Storage Systems Are Designed (https://wwstanks.com/learning-center/how-industrial-wastewater-storage-systems-are-designed/).
Choosing the Right Temporary Storage Solution
The right temporary storage solution starts with the fluid, not the tank. A buyer should define what will be stored, how much volume is expected, how quickly the fluid will move, how long storage is needed, and what happens after storage.
Then the site should be reviewed. Important factors include road access, turning radius, staging space, grade, drainage, weather exposure, containment needs, truck loading areas, pump placement, hose routing, and nearby operations. A tank system that works on one site may not work on another if access and transfer conditions are different.
Finally, the system should match the project’s operating goal. A high-volume frac water project may need modular AST capacity. A flowback or wastewater project may need specific tank access and transfer planning. A construction dewatering project may need storage that can respond to changing pump rates and weather.
WWS offers frac tanks, flowback tanks, modular AST systems, and remote fluid monitoring systems for industrial and oilfield applications. To discuss temporary storage options, visit WWS Tank Services (https://wwstanks.com/services/) or Contact WWS Tanks (https://wwstanks.com/contact/).
Key Takeaways
Frac tanks are portable industrial storage tanks used for temporary liquid storage in oilfield, wastewater, construction, and industrial operations.
In oilfield work, frac tanks may support frac water staging, flowback storage, produced water storage, drilling support, and temporary field fluid management.
Frac tanks are part of a larger fluid management system that may include pumps, hoses, manifolds, transfer lines, monitoring, containment, and hauling coordination.
Open top and closed top tanks serve different operational needs. The right choice depends on fluid type, access, weather, transfer needs, and site conditions.
Modular ASTs may be a better fit for high-volume storage, while frac tanks may fit localized or smaller temporary storage needs.
WWS Tanks supports industrial and oilfield fluid storage. We do not drill residential water wells, install septic systems, or provide household plumbing services.
