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USA MadeHydrostar Onion TankEmergency Water Storage Tanks

The Self-Rising, Self-Supporting Open Top Onion Tank

Popular with firefighting efforts, our onion water tank Emergency Water Storage Onion Tank (also called pumpkin water tanks and blivets) is the perfect way to quickly store and supply water during emergency events. Designed with an open top, self rising tank walls, and easy access fittings, Hydrostar open top onion tanks can be moved and set up in minutes, making them ideal for any of the following uses:

  • Decontamination
  • Firefighting Efforts
  • Temporary Water Storage
  • Water Relay
  • Mixing Tank
  • Rural or Military Water Storage
  • Hazardous Waste
  • Potable Water Storage
  • Disasters or Emergency Relief & Response (Tsunamis, Tornadoes, Flooding, Hurricanes, Earthquakes) See sizes and dimensions.

Self rising tank ready to go in minutes. Watch how fast and easy!

Typical Onion Water Tank Specifications

Gallons (Liters)
Base Dia.
Filled Height
250 (946)
5'10" (1.8 m)
28' (0.7 m)
Low Side
500 (1,893)
7' (22 m)
30" (0.8m)
Low Side
1,000 (3,785)
7' (22 m)
32" (0.8 m)
Low Side
2,000 (7,570)
13' (3.9 m)
32" (0.8 m)
Low Side
2,500 (9,463)
14'3" (4.4 m)
32" (0.8 m)
Low Side
3,000 (11,355)
15'3" (4.8 m)
34" (0.8 m)
Low Side
6,000 (22,710)
21'6" (6.6 m)
33" (0.8 m)
Low Side
500 (1,893)
5' (1.5 m)
36" (0.9 m)
High Side
1,000 (3,785)
8'6" (2.6 m)
44" (1.1 m)
High Side
1,200 (4,542)
9'8" (3.0 m)
44" (1.1 m)
High Side
1,600 (6,056)
10'9" (3.3 m)
46" (1.15 m)
High Side
1,800 (6,813)
11' (3.4 m)
High Side
2,000l (7,570)
14'4" (4.4 m)
48" (1.2m)
High Side
2,500 (9,463)
12'8" (3.9 m)
48" (1.2m)
High Side
3,000 (11,355)
14'2" (4.3 m)
High Side
10,000 (37,850)
19'4" (5.8 m)
80" (2 m)
High Side

Request a Quote Questions?
Call our team at +1-772-646-0597

*Additional sizes are available on request

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Learn more About Open Top Hydrostar Emergency Water Storage Tanks

Portable Onion Tanks, also known as "Blivets" or pumpkin water tanks, onion water tank have self rising tank walls, are available from 250 to 20,000 gallons, and come with:

  • Floating Foam - no inflation required
  • Heavy Duty PVC Material
    • FDA-approved potable water models available
  • Welded Seams for Long Life
  • Side Support
    • Low or High Side Walls
  • Optional Accessories:
    • Covers
    • Ground Cloth

These flexible tanks are operational in minutes and are used for temporary liquid storage where response time is critical. Use Onion Tanks for water, to store recovered hazardous materials, oil hazardous materials (HAZMAT), and other liquids.

These Emergency Water Storage Tanks can store multiple liquids* including:

  • Water (gray, black)
  • Drinking Water (potable water fabric available upon request)
  • Recovered Crude Oil
  • Jet Fuel from fueling operation*
  • Firefighting Foam
  • Sewage and other Contaminants

*Not all fabrics are suitable for all uses. Please let us know how you plan to use your Onion Tank so we can make sure it's constructed with the right fabric and coating for your specific needs.

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Questions? We can help! Call our team at +1-772-646-0597 or fill out our quote request form to discuss your requirements.

Emergency Relief & Response: Fast & Easy Emergency Water Storage

The Emergency Water Storage Tank is made tough and designed with self-supporting walls that rise self supporting self rising tankas the Onion Tank fills with water. When compared to other water storage tanks, these open top Onion Tanks offer the following advantages:

  • Tank Rises as Filled with Liquid
  • Fast Set up on Site
  • Lays Flat for Transport
  • Open Top
  • Large Storage Space
  • Multiple Sizes
  • Folds Quickly for Convenient Storage
  • Sets up in Minutes
  • Self Rising and Self Supporting

For custom sizing or a specific storage application, please call our team at +1-772-646-0597 or fill out our quote request form to discuss your requirements.

Other Resources

Other Emergency Water Tank Resources

Other Helpful Resources for Emergency Water Storage