custom roto molding|SKU:CRMI-500CT-var-55550-74ed9e

CRMI Underground Cistern: HDPE Burial Water Storage Tank

Secure Underground Water Storage for Demanding Sites

Burial-ready HDPE construction — High impact resistance for underground installation
Secure locking lid system — 22 inch gasket lid prevents contamination
Dual NPT polypro fittings — 2 inch inlet and outlet on each side
Two capacity options — Choose 500 or 1,000 gallon configurations
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Price range: $1,199.00 through $1,799.00

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In the box

  • CRMI Cistern tank (HDPE)
  • 22 inch locking gasket lid
  • 2 inch NPT polypro inlet fitting
  • 2 inch NPT polypro outlet fitting
CRMI Cistern
CRMI Underground Cistern: HDPE Burial Water Storage Tank
$1,199.00 – $1,799.00Price range: $1,199.00 through $1,799.00

Secure Underground Water Storage for Demanding Sites

Secure your water supply with the CRMI Cistern, a vetted underground storage system designed for commercial, industrial, and residential applications. Built from high-density polyethylene (HDPE), this tank delivers high impact resistance for demanding environments. Available in 500 and 1,000-gallon capacities, it features a 22-inch locking gasket lid and dual 2-inch NPT polypro fittings. This is a long-term investment in water security, offering commercial-grade durability you can rely on. Ships free.

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HDPE Construction
Locking Gasket Lid
Dual NPT Fittings
500 or 1000 Gallon
500 / 1000
Gallon Capacities
22 inch
Locking Lid Opening
2 inch
NPT Inlet/Outlet
Roto-Molded HDPE Eliminates Weld Failure Points

Roto-Molded HDPE Eliminates Weld Failure Points

Unlike welded steel tanks where a single failed seam means leaks, soil contamination, and regulatory fines, the CRMI Cistern uses rotational molding to form a seamless high-density polyethylene shell. This vetted manufacturing process eliminates weld joints entirely — the most common failure point in underground storage. HDPE delivers high impact resistance and a high melting point, holding up against soil pressure, ground movement, and temperature shifts without cracking. For fleet managers and property owners who cannot afford downtime from a failed tank, this monolithic construction represents a significantly more reliable investment. The result is continuous water storage without the compliance risk that welded alternatives carry.

Sealed Lid System Keeps Water Supply Contaminant-Free

Sealed Lid System Keeps Water Supply Contaminant-Free

The 22 inch locking gasket lid creates a positive seal that blocks debris, insects, and surface runoff from entering your stored water supply. For commercial and residential applications where water quality matters — irrigation systems, fire suppression reserves, or emergency potable storage — this lid design provides consistent protection without requiring constant monitoring. The gasket material maintains its seal through seasonal temperature cycles, unlike rigid covers that can warp or shift under ground load. This curated design choice reflects Custom Roto Molding Inc's understanding that underground storage is only as effective as its ability to keep contents isolated from the surrounding environment.

Dual NPT Fittings Simplify Piping Connections

Dual NPT Fittings Simplify Piping Connections

The CRMI Cistern includes a 2 inch NPT polypropylene inlet on one side and a matching outlet on the opposite side, giving you straightforward plumbing integration without custom fitting adapters. Standard NPT threading means your existing pipe connections, valves, and pumps thread directly into the tank — reducing installation time and eliminating the need for specialty hardware. Polypropylene fittings resist corrosion from water chemistry and soil contact, unlike metal fittings that degrade over time in burial conditions. This straightforward dual-port configuration is why Tank Vault selected this cistern for our catalog: it respects your investment by reducing both upfront installation complexity and long-term maintenance requirements.

Compatibility & Sizing Guide

Verify your site meets these requirements before installation.

  • Site accommodates up to 102-inch diameter footprint
  • Trench depth allows for standard inlet/outlet pipe routing
  • Soil bearing capacity supports full tank weight when filled

Primary Applications

Engineered for environments where reliable water access is critical.

Commercial Properties
Industrial Facilities
Residential Estates

Full specifications

At a glance

Dimensions
102 inches diameter (See product page for height)
Surface
High Density Polyethylene (HDPE)
Warranty
See product page
Full specifications6 data points across 4 categories

Dimensions

500 Gallon Dimensions102 inches diameter (See product page for height)
1000 Gallon DimensionsSee product page

Power & Performance

Storage Capacity500 Gallon or 1000 Gallon

Materials

Tank MaterialHigh Density Polyethylene (HDPE)
Fitting MaterialPolypropylene

Compliance & Warranty

WarrantySee product page

The Tank Vault Promise

Every tank we carry meets strict performance and durability standards.

Vetted QualityWe verify build materials and manufacturing standards so you don't have to.
Ships FreeUnconditional free shipping on every order, directly to your site.
30-Day ReturnsHassle-free 30-day return window if the tank doesn't meet your needs.
★★★★★
“We installed the 500 gallon CRMI cistern at our maintenance yard for wash-down water and fire suppression reserve. The poly fittings made plumbing straightforward — our crew had it connected in under four hours. No issues after six months buried, even through a wet spring season. This is the kind of tank you set and forget.”
F
First L.Dallas, TX

Custom Roto Molding Inc underground water cistern tank provides efficient fresh water storage for commercial, industrial, and residential use. The burial water storage tanks range in size from 500 gallons to 1,000 gallons and are available in high density polyethylene (HDPE). 

Tank Material:

  • HDPE – High Density Polyethylene is a thermoplastic polymer created from petroleum.  HDPE has a high impact resistance and melting point.

Cistern Tank Features:

  • 22 inch locking gasket lid.
  • 2 inch NPT polypro inlet & outlet (one on each side).

      Water Tank Dimensions (Diameter x Height in inches):

      • 500 Gallon: 102″ L x 60″ W x 34″ H / 215 pounds
      • 1,000 Gallon:  102″ L x 60″ W x 58″ H / 385 pounds

      Cistern Spec Sheets:

      Additional Options:

      • Browse all water storage tanks available.

        Additional information

        Size

        1000 Gallon, 500 Gallon

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        Frequently Asked Questions

        All grills ship fully assembled in heavy-duty crating. Just remove the packaging, add propane or charcoal, and cook. No tools required.
        We offer free 30-day returns on all grills. If you're not completely satisfied with your purchase, contact us and we'll arrange a free pickup.
        Yes — 0% interest financing is available on eligible purchases. Split into 4, 6, or 12 monthly payments with no hidden fees.
        Yes. We carry a full catalog of OEM replacement parts including grates, burners, igniters, and heat shields for every brand we carry.
        Absolutely. Our grills are built for all-weather use. The 304 stainless steel construction is designed to handle temperature extremes from -20°F winters to 110°F summers.
        SKU: CRMI-500CT Categories: , Brand:

        The Tank Vault Promise

        Every tank we carry meets strict performance and durability standards.

        Vetted Quality We verify build materials and manufacturing standards so you don't have to.
        Ships Free Unconditional free shipping on every order, directly to your site.
        30-Day Returns Hassle-free 30-day return window if the tank doesn't meet your needs.

        Related products

        About custom roto molding Cistern

        custom roto molding is a trusted manufacturer of premium cistern. TankVault is an authorized dealer offering the full custom roto molding lineup with free delivery, price match guarantee, and expert support.

        View all custom roto molding products →

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