stormVAULT Big Storage Tanks
Underground Water Tanks NZ – Discreet & Durable Water Storage
No matter where you need stormwater management – beachfront or hillside – stormVAULT underground water tanks have you covered.
Our underground water tanks have been designed and tested for the majority of soil types and water table conditions in New Zealand and are not reliant on surrounding soil structures for strength. They can be installed under lawn or concrete.
stormVAULT is the thickest, strongest, and heaviest product on the market. We know that the demands put on underground water tanks are high, so stormVAULT has been built to exceed design standards.
Compliance? No worries! stormVAULT tanks comply with council requirements, meaning they’re an easy, trouble-free solution to managing stormwater on your site or property.
→ Features
Simple, Reliable Retention & Detention
UV Stabilised
Polyethylene cannot rot or corrode and is UV stabilised for New Zealand’s harsh environmental conditions.
The manufacturing process produces zero waste of polyethylene and the product is 100% recyclable. At the end of its useful life, it can be returned to us to be recycled into other long-lasting products.
High Quality Material
stormVAULT tanks are manufactured from the highest quality polyethylene available which is ideally suited to Devan’s moulding technique, giving long life and trouble-free service.
The material is certified to AS/NZ4766:2006, AS/NZS4020:2005, and AS/NZS 2070 so are suitable for potable water.
Easy Specification
The tank is the strongest design on the market and has achieved compliance to AS/NZS1546 Septic Tank Standard, ARMA COP15 Underground Tank Code of Practice, and verified by CPEng Engineers here in New Zealand.
The material is certified to AS/NZS4766:2006, AS/ NZS4020:2005, and AS/NZS 2070.
By Kiwis, for Kiwis
stormVAULT has been proudly designed and manufactured in New Zealand with the intent to provide a rainwater harvesting solution for Kiwis right from Cape Reinga to Bluff.
→ Benefits of stormVAULT
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Remarkable strength & resilience
Thickest, strongest, and heaviest underground tank on the NZ market—solid‑filled rib design, interlocking joints, and anti‑float anchors ensure it performs under all soil and water table conditions
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Engineered to meet standards
Certified compliant with AS/NZS4766, 4020, 2070 and septic tank, underground tank, and CPEng engineering codes—guaranteeing regulatory confidence
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Ideal for tight or covered spaces
Can be installed under lawns or concrete areas, including driveways—perfect for sites with limited space or specific design needs
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Long-lasting & recyclable
Constructed from UV-stabilized polyethylene, 100% recyclable with zero‑waste manufacturing—made to last for decades with low environmental impact
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NZ-made with full support
Manufactured locally with over 30 years of proven quality, backed by a reassuring 15-year warranty
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Scalable capacity options
Available in sizes from 2,000 L up to 10,000 L, and multiple tanks can be linked for flexible storage solutions
→ Options
Dimensions: overall Length x main tube diameter x turret height
2000L - 2.3m x 1.2m x 2.3m - Weight: 170kg
3000L - 3.2m x 1.2m x 2.3m - Weight: 225kg
4000L - 5.0m x 1.2m x 2.3m - Weight: 340kg
5000L - 5.0m x 1.2m x 2.3m - Weight: 340kg
6000L - 5.9m x 1.2m x 2.3m - Weight: 395kg
7000L - 6.7m x 1.2m x 2.3m - Weight: 450kg
8000L - 7.7m x 1.2m x 2.3m - Weight: 510kg
9000L - 8.6m x 1.2m x 2.3m - Weight: 570kg
10000L - 9.5m x 1.2m x 2.3m - Weight: 625kg
→ Explore In-Depth Case Studies
New Zealand's Only Whole-System Water Experts: Stormwater Management & Water Sustainability
Case studies are a great way to understand how our products are being used in the real world. They provide a glimpse into the success stories of our customers, and show us how our products have helped them achieve their goals.
→ stormVAULT FAQ's
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The tanks have been designed for the majority of soil types and water table conditions in New Zealand. They are not reliant on surrounding soil structures for strength.
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stormVAULT tanks have been built to be easily installed under your lawn, but they can also be installed under a concrete drive if space is a premium on your site.
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stormVAULT stormwater tanks come with a 15-year domestic warranty. Devan has been in business for over 30 years and if there’s anything that time has taught us, it is that our customers see no compromise when it comes to confidence and reliability.
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They sure are! stormVAULT has achieved compliance to AS/NZS1546 Septic Tank Standard, ARMA COP15 Underground Tank Code of Practice, and has been verified by CPEng Engineers here in New Zealand. The material is certified to AS/NZS4766:2006, AS/NZS4020:2005, and AS/NZS 2070
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The highest quality polyethylene available. Polyethylene cannot rot or corrode and is ultraviolet stabilised. The manufacturing process produces zero waste and the product is 100% recyclable; it’s also ideally suited to our moulding technique, giving long life and trouble-free service.
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Each tank is manufactured to meet whatever your volume requirements are. Standard sizes are available in any combination from 2,000L to 10,000L with other volumes available on request. The more volume you require, the longer the tank. Larger volumes are achieved by coupling multiple tanks together onsite with ease.
Tell Us About Your Project
From conceptualising to constructing, we’re ready to design your architectural dream. We promise a client-centric approach that empowers ideas, eases concerns, and delivers quality craftsmanship we’ll all be proud of.
