Rainwater Harvesting Tanks

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Corrugated Steel and Wooden Rainwater Harvesting Tanks

Water Storage Tanks, Inc. manufactures rainwater harvesting tanks for commercial, residential, agricultural, and industrial applications. Our CorGal® corrugated galvanized steel tanks and TimberTank® eastern red cedar wooden tanks provide durable, high-capacity storage for collected rainwater, with sizes ranging from approximately 375 gallons to more than 1,000,000 gallons.

Whether you’re designing a rainwater collection system for irrigation, potable water storage, landscaping, stormwater retention, or general water conservation, our tanks can be configured around the capacity, design, footprint, and connections required for your project.

Our rainwater harvesting tanks are available in a wide range of sizes and custom capacities. Both our CorGal and TimberTank water storage tanks can be used for commercial, industrial, residential, and architectural applications. We offer premium solutions for our discerning customers and back our tanks with an unprecedented warranty.

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Tank Options for Rainwater Storage

Photo of a CorGal® rainwater harvesting tank collecting water for reuse for a residential home in Central Texas. As the intellectual property of Water Storage Tanks, Inc., this image is subject to copyright.

CorGal Steel Rainwater
Harvesting Tanks

Our signature CorGal tanks are engineered for strength, longevity, and high-capacity rainwater storage.

Capacity: 700 gallons to over 1,000,000 gallons
Features: Modular design, customizable roof options, internal liner systems
Applications: Residential, commercial, agricultural, industrial

Photo of TimberTanks® collecting rainwater for a local business in Central Texas. As the intellectual property of Water Storage Tanks, Inc., this image is subject to copyright.

TimberTank Rainwater
Harvesting Tanks

TimberTanks offer aesthetic beauty and functionality, crafted from premium USA-sourced red cedar.

  • Capacity: 375 gallons to 29,000 gallons
  • Ideal For: Homes, parks, eco-lodges, and sustainable architecture
  • Bonus: Naturally insulating and blends into rustic landscapes
Top-down shot of two tall CorGal Rainwater Harvesting Tanks in an apartment courtyard

Custom Rainwater
Storage Solutions

For unique projects, our engineers can design and build custom rainwater harvesting tanks tailored to your specific needs.

  • Options include: Specialty materials, signage, custom capacities, and integrated systems for large-scale operations

Rainwater Harvesting Tank Sizes & Capacities

Choosing the right rainwater harvesting tank size depends on your available catchment area, local rainfall, intended water use, desired reserve capacity, and available footprint. Because CorGal and TimberTank water tanks are available in a wide range of diameters and heights, capacity can often be configured around the space available for the project.

For rainwater collection systems, tank sizing should consider both how much rainwater can realistically be collected and how quickly the stored water will be used. Water Storage Tanks, Inc. offers rainwater harvesting tanks that vary in size from 375 to 1,000,000 gallons for your use case.

CorGal Tank Sizing
TimberTank Sizing
Photo of a calculator with 'click here' written beneath it. Additional text stating "Did you know, a 1,000 Square-Foot catchment area can produce approximately 600 gallons of water per inch of rain? Calculate your potential catchment using the Department of Energy's Rainwater Harvesting Calculator
Photo of a CorGal® rainwater harvesting tank supplying water reuse for a business in Central Texas. As the intellectual property of Water Storage Tanks, Inc., this image is subject to copyright.

What Is Rainwater Harvesting and Why Is It Important?

Rainwater harvesting (also known as rainwater collection, rainwater capture, or rainwater catchment) is the process of collecting and storing rain for future use. Whether you’re watering crops, powering gray water systems, or seeking off-grid independence, a reliable rainwater storage solution is essential to maximizing this free and abundant resource.

Our CorGal tanks and TimberTanks form the heart of your rainwater catchment system, providing a safe, scalable, and dependable place to store water after it’s been captured. Designed for durability and adaptability, they ensure that your harvested rainwater stays clean and accessible when you need it most.

Why Choose Rainwater Harvesting?

Rainwater harvesting is more than just a water-saving strategy; it’s a commitment to sustainability and smart resource management.  With proper rainwater harvesting tanks and conveyance, you can efficiently capture and store one of Earth’s most valuable resources while meeting your operational needs and environmental goals. By collecting and storing rainwater, you can:

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Save Money

Reduce your reliance on municipal water systems and lower your utility bills.

Icon of water droplets to represent ensuring water availability. As the intellectual property of Water Storage Tanks, Inc., this image is subject to copyright.

Ensure Water Availability

Store rainwater for irrigation, livestock, landscaping, and more, even during times of drought or seasonal shortages.

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Comply with Regulations

Rainwater Harvesting is a viable alternative to traditional stormwater retention systems while still meeting EPA requirements.

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Promote Sustainability

Support environmentally friendly practices by conserving natural water resources.

NSF-61 Liners for Potable Rainwater Storage

For applications that require potable rainwater, our NSF-61 certified liner systems ensure compliance with the National Sanitation Foundation’s standards.  These liners are used in rainwater tanks designated for:

  • Drinking water
  • Cooking and food prep
  • Showers and household use

CorGal tanks and TimberTanks lined with an NSF-61 liner ensure harvested rainwater remains clean and safe until it’s needed.

Always treat rainwater before consumption using UV filtration, carbon filters, or reverse osmosis as part of your rainwater treatment system.

Photo of a NSF-61 potable liner system used in a CorGal® water storage tank. As the intellectual property of Water Storage Tanks, Inc., this image is subject to copyright.

How to Collect Rainwater: The Rainwater Harvesting Process

Infographic displaying how a rainwater harvesting system works, detailing the various parts included in a rainwater harvesting system. As the intellectual property of Water Storage Tanks, Inc., this image is subject to copyright.

Step 1: Rainwater Collection

Rain lands on your roof or other catchment surfaces and is directed into gutters and downspouts. This water is then channeled toward your rainwater catchment tank, which acts as the central hub of your system. Proper design of this system will maximize your rainwater conveyance and minimize potential contamination.

Step 2: Pre-Filtration

Before water enters the tank, it passes through first-flush diverters, screens, or sediment traps to remove debris. This step protects your tank, reduces maintenance, and lowers strain on any downstream treatment.

Step 3: Rainwater Storage

Once the rainwater has passed through your catchment and pre-filtration systems, it’s transported to our CorGal tank or TimberTank. Our tanks are engineered to maintain water quality, provide corrosion resistance, and ensure reliable storage in any climate. Complementing our tanks are high-performance geotextile fabrics and an extensive selection of liners designed for both potable and non-potable uses.

Step 4: Distribution & Treatment

Final steps in this process will differ based on use case, but your water can be either:

  • Pumped directly from the tank for non-potable applications such as irrigation or industrial processes.
  • Routed through a rainwater treatment system, typically UV or Reverse Osmosis, for potable water applications.

Our tanks integrate seamlessly with existing systems. If you want to utilize a municipal line, well, or an additional tank, all water can be routed into your storage tank before the filtration process.

Applications for Rainwater Harvesting

Rainwater harvesting systems are versatile and adaptable to a variety of applications, including:

Residential: Water lawns and landscaping, wash vehicles, flush toilets, fire protection, potable water, and reduce household water usage.
Agricultural: Irrigate crops and orchards, hydrate livestock, clean equipment, and prepare for drought seasons.
Commercial & Industrial: Manage facility landscaping, wash equipment, coolant systems, data centers, greywater systems, process water for manufacturing, and reduce operational costs.

 

DISCLAIMER:

Water Storage Tanks, Inc. only offers the sale of CorGal and TimberTank and typical rainwater catchment appurtenances that would be affixed directly to the tank itself. Pumps, external piping, and filtration systems, or treatment components, are not offered for sale by Water Storage Tanks, Inc. Any mention or visual representation of these additional components is included for educational purposes only.

For questions about our available product offerings or to be connected with a certified dealer who may provide complete system solutions, please contact us.

Learn More About Rainwater Harvesting Laws

View Our Guide
Map of the United States that is color coordinated by Rainwater Collection Legal Status according to the Department of Energy's Rainwater Harvesting Calculator.

*This map is based on data from the U.S. Department of Energy’s Rainwater Harvesting Calculator. Visit the DOE’s website here to learn more.

Is it Legal to Collect Rainwater? Understanding the Legality Across States

One of the most frequently asked questions about rainwater harvesting is: “Is collecting rainwater illegal?” The short answer is no. In fact, in nearly every state in the U.S., rainwater harvesting is perfectly legal and often encouraged. However, depending on where you live, restrictions or permits may apply, especially when systems are large-scale or tied to potable use.

At Water Storage Tanks, Inc., we believe that knowledge is key to responsible rainwater harvesting. That’s why our team of experts helps you understand the legality of collecting rainwater in your state and how our tanks fit into a safe, compliant system.

Ready to learn more about rainwater harvesting in your state?

Is Rainwater Harvesting Illegal? Blog

Common Rainwater Harvesting Tank Appurtenances

Photo of a rain gutter filter being installed. As the intellectual property of Water Storage Tanks, Inc., this image is subject to copyright.

Debris Filter

Photo of a debris filter for rainwater collection. As the intellectual property of Water Storage Tanks, Inc., this image is subject to copyright.

Gutter Filter

Photo of an inlet filter with a pvc pipe extending from a building.

Inlet Filter

Two blue carbon and sediment filters are plumbed and fastened to the wall

Sediment and Carbon Filters

Photo of a UV disinfection water filter used for cleansing filtered water for safe potable consumption and usage. As the intellectual property of Water Storage Tanks, Inc., this image is subject to copyright.

UV Disinfection Filter

Photo of a floating filter affixed to the interior of a CorGal® rainwater harvesting tank. As the intellectual property of Water Storage Tanks, Inc., this image is subject to copyright.

Floating Filter

Blue Calming Inlet attached to white PVC inlet

Calming Inlet

Photo of a Submersible Pump installed in a CorGal® Rainwater Harvesting tank. As the intellectual property of Water Storage Tanks, Inc., this image is subject to copyright.

Submersible Pump

Photo of a blue and gold, dual pump system

Exterior Pump

Photo of a CorGal rainwater harvesting tank with a rainwater catchment dam on the roof. As the intellectual property of Water Storage Tanks, Inc., this image is subject to copyright.

Roof Dams

Photo of a CorGal® tank with an inverted roof for rainwater harvesting. As the intellectual property of Water Storage Tanks, Inc., this image is subject to copyright.

Inverted Roof

Photo of a water truck fill connection installed on a CorGal® rainwater storage tank. As the intellectual property of Water Storage Tanks, Inc., this image is subject to copyright.

Truck Fill Connection

Why Partner with Water Storage Tanks, Inc.?

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End-to-End Support

From project design and compliance to manufacturing and delivery, we have the credentials and expertise to take your project to the next level. Have any questions or concerns about rainwater catchment? Our team of experts is here to help.

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Proven Expertise

For more than two decades, we’ve led the rainwater storage industry as pioneers, delivering innovative solutions that meet the highest standards of safety, compliance, and sustainability.

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Nationwide Network

Our extensive network of CorGal-authorized dealers across the U.S. and Canada provides local expertise, quick response times, and reliable support, ensuring you get the best rainwater storage solutions wherever you are.

Our Credentials

We understand it’s important to know that your tank is built and constructed with care, and to the standard you expect. At Water Storage Tanks, Inc., we are proud of our compliance record and ability to work from state to state, ensuring that the tank delivered to you is not just acceptable but exceeds your expectations.

Water Storage Tanks Inc. Tanks Comply With:

  • International Plumbing Code (IPC)
  • International Residential Code (IRC)
  • Uniform Plumbing Code (UPC)
  • International Fire Code (IFC)
  • CSA B805/ICC 805 – Rainwater Harvesting Systems Standard (2022)
  • NFPA 22 – Standard for Water Tanks for Private Fire Protection
  • State Stormwater Management Manual
  • State Water Quality Code (TCEQ, EPA, State Water Boards, Etc.)

Ready to Catch Rainwater Like a Pro?

Don’t let another drop go to waste. Get Started on Collecting Rain Today!

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