JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser.

Best Freight Rates Every Time!

Compare Products

Home
Water Tanks
Stationary Water Tanks
Underground Plastic Water Tanks

Underground Plastic Water Tanks - 501 to 1000 Gallons - South Carolina - Washington

Find Durable Polyethylene Underground Water Tanks
When a permanent and discreet water storage solution is needed, a polyethylene underground water tank is the ideal choice. Tank Depot specializes in these durable tanks, engineered to provide a secure, buried solution without the rust and corrosion issues of traditional materials. ...

Our selection of underground water tanks is specifically designed for a straightforward and low-effort installation. We make it simple to find a reliable solution that stays out of sight while providing a dependable source of water.

Applications of Tank Depot's Underground Water Tanks

Our underground plastic water tank solutions range from 225 gallons to 20,000 gallons, providing a versatile option for nearly any project. These applications include:

Residential Water Storage

Residential Water Storage

An underground water tank is an excellent choice for homes where space is limited. They provide a safe, concealed solution for storing drinking water, or for use as a backup water supply for your household. This allows you to secure a consistent water source without a large tank taking up space in your yard.

Rainwater Harvesting Systems

Rainwater Harvesting Systems

These poly cistern tanks are the foundation of a modern rainwater harvesting system. They collect water from downspouts, keeping it safe from light and contamination, which helps reduce algae growth. The discreet design keeps your landscape uncluttered while providing a sustainable water source for irrigation, garden use, and more.

Fire Suppression & Emergency Water

Fire Suppression & Emergency Water

For homes and businesses in rural areas, an underground water storage tank can be a critical component of a fire protection system. These large-capacity tanks ensure a ready supply of water for fire suppression and serve as a reliable emergency reserve during natural disasters or power outages.

Well & Municipal Water Reserves

Well & Municipal Water Reserves

Our belowground plastic water tanks are ideal for well water systems, providing a secure place to hold a large reserve. They can also be used as a supplementary water source for municipal systems, ensuring a consistent supply in times of high demand or for non-potable uses like landscaping or street cleaning.

Wastewater & Septic Systems

Wastewater & Septic Systems

Certain models are specifically designed to serve as underground septic tanks and wastewater holding tanks. They provide a durable, cost-effective, and pre-plumbed alternative to traditional concrete tanks. Note: Not all underground cisterns come pre-plumbed.

Industrial & Agricultural Applications

Industrial & Agricultural Applications

From farms to industrial sites, our underground tanks are built for heavy-duty use. They are perfect for storing large volumes of non-potable liquids, providing a secure and durable solution for irrigation, bulk liquid delivery, and other essential industrial processes.

Why Choose Tank Depot for Underground Water Storage

Engineered for Durability

Engineered for Durability

Our tanks are rotationally molded from durable, high-density polyethylene in a seamless, one-piece construction. This ensures they will not rust, leak, or corrode, providing long-lasting, reliable performance.

Simple, Low-Effort Installation

Simple, Low-Effort Installation

Some of our underground water tanks, like those from Norwesco, require no special backfill or water filling during installation (not all models). This simplifies the process and reduces time and effort on the job site.

Safety & Compliance

Safety & Compliance

We prioritize safety. Our buried polyethylene tanks are made from FDA-approved resins and meet stringent industry standards. Many are NSF-certified for safe storage of potable water.

Superior Structural Integrity

Superior Structural Integrity

A ribbed design and molded-in support columns provide superior structural strength. This allows our underground tanks to withstand the pressure of being buried, ensuring a secure and reliable underground solution.

Ready for Customization

Ready for Customization

While fittings are generally not installed, our tanks are designed with multiple flats for easy, on-site plumbing connections. We offer a variety of accessories, including riser extensions and plumbing kits, to ensure the buried tank meets your project's specific needs.

Multi-Use Application

Multi-Use Application

Our underground storage tanks are versatile solutions for rainwater harvesting, well water storage, fire protection, and stormwater management. Certain models also serve as septic or wastewater holding tanks, meeting both residential and commercial needs.

Trust Tank Depot For Your Underground Water Storage

Choosing a reliable underground water tank is a long-term investment in your home or business. With our selection of durable, seamless polyethylene tanks, you get a solution that is not only built to last but is also easy to install and certified for safety. We eliminate the guesswork, offering tanks with superior structural strength and proven performance.

Explore our full range of plastic underground water tanks today. Find the ideal size and style for your needs, and trust that you're choosing a secure, low-maintenance solution from an industry leader.

	Capacity	Name	Diameter	Length	Width	Height	SKU	Price
	525 Gallons	Norwesco 525 Gallon Plastic Underground Water Storage Cistern Tank	64	64	64	62	N-44829	$1,593.00
	550 Gallons	Norwesco 550 Gallon Plastic Underground Water Storage Cistern Tank	64	64	64	67	N-40856	$1,499.99
	600 Gallons	Norwesco 600 Gallon Underground Water Storage Cistern Tank		101	51	47	N-41328	$1,399.99
	1000 Gallons	Norwesco 1000 Gallon Plastic Multi-Use Underground Liquid Storage Tank		102	60	63	N-41734	$2,099.99
	1000 Gallons	Norwesco 1000 Gallon Plastic Multi-Use Underground Liquid Storage Tank with Gaskets, Tees, and 2 Manhole Covers		102	60	63	N-44463	$2,049.99
	1000 Gallons	Norwesco 1000 Gallon Plastic Multi-Use Underground Liquid Storage Tank		102	60	63	N-41735	$2,449.00
	1000 Gallons	Norwesco 1000 Gallon Plastic Multi-Use Underground Liquid Storage Tank (for Canada)		102	60	63	N-41736	$2,439.00