What Changed
Vancouver’s 2025 Stormwater Regulation Affects More Home Projects Than You Think
- Starting July 1, 2025, all new homes in Vancouver must include a rainwater detention tank.
- Major renovations that trigger a new home warranty may also fall under this rule.
- Applies to most lots under 1,000 m² and FSR ≤ 1.0.
- You may not need an engineer—but you do need the right tank.
We’ve Got the Tank That Checks Every Box
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Approved tank sizing (3,400L to 7,200L)
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Orifice flow control
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Sewer gas trap & backwater valve
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Gravity overflow
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Cleanout access
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Low-profile design = less digging
offering
How to Stay Compliant in 3 Steps
Choose Your Lot Size
We help you find the right tank for your site.
Order & Install
Fast local delivery, optional contractor support.
Submit Specs with Plumbing Permit
Our tech sheet meets City of Vancouver submission needs.
Installation Made Easy
Our detention tank packages are designed for fast, code-compliant installation with minimal site disruption. Whether you're a contractor or a homeowner working with one, this quick video will walk you through the key steps.
Need help? Contact us for project-specific guidance.
Request Support
Tank Sizes & Lot Match Table
| Lot Size (m²) | Active Storage (L) | Orifice Size (mm) | Subsurface Suitable? | Backwater Valve? | Trap? | Suitable Tank |
|---|---|---|---|---|---|---|
| ≤ 400 | 3,400 | 30 | ✅ Yes – details provided | ✅ Yes | ✅ Yes | GRAF Platin 3400 |
| 401 – 500 | 3,900 | 35 | ✅ Yes | ✅ Yes | ✅ Yes | GRAF Platin 3900 |
| 501 – 750 | 4,600 | 45 | ✅ Yes | ✅ Yes | ✅ Yes | GRAF Platin 4600 |
| 751 – 1000 | 7,200 | 50 | ✅ Yes | ✅ Yes | ✅ Yes | GRAF Platin 7200 |
FEATURED COLLECTION
Why This Tank Makes Sense for Your Build
♻️ Recycled Materials: Every tank gives plastic a second life
🧱 Structurally Strong: Rated for below-ground installs—even under driveways
🔧 Installer-Friendly: Dual access ports, cleanouts, and shallow depth
📏 Code-Ready: Sized to meet City regulations exactly—no guessing
🌧️ Controlled release prevents sewer overload
Faq
Top Questions
Do I need a detention tank for my new home build?
Yes—if you're building a new house in Vancouver, a rainwater detention tank will be required starting July 1, 2025, unless your project qualifies for an exemption (e.g., laneway homes on lots under 1,000 m²).
I’m doing a major renovation—does this apply to me?
It may. If your renovation is considered a “new home” under BC Housing rules (e.g., it triggers a new home warranty), you’ll need to comply with the new stormwater regulations.
What size tank do I need?
It depends on your lot size. The City requires active storage between 3,400L and 7,200L, with specific orifice sizes. We’ll help you select the right GRAF Platin tank that matches your property.
Can I install the tank myself, or do I need an engineer?
If your lot is 1,000 m² or less and your FSR is 1.0 or lower, you qualify for the small site pathway—no engineer needed. The tank just needs to meet sizing and plumbing specs.
Do your tanks include all the required components?
Yes. GRAF Platin tanks are designed to support gravity overflow, orifice plates, traps for sewer gas, and backwater valves—everything needed for compliance.
Can I reuse rainwater for irrigation or toilets?
Yes, but reusing rainwater is optional. It doesn't replace the need for a detention tank. If you want to include rainwater reuse, we can help design a compliant system.
Why Buy Graf Platin Tanksfrom Barr Plastics?
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Local Stock
Large inventory of Graf Platin tanks and accessories stocked in BC for fast delivery.
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In-House Fabrication
Custom fittings and risers pre-installed by BARR’s experienced fabrication team.
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Complete System Packages
Tanks come fully prepped with matched components—filters, pumps, risers, lids, etc.
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Time-Saving Installation
No need for on-site modifications—contractor simply ties into inlet, outlet, and overflow.
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Expert Support
Technical guidance available from a knowledgeable team with deep rainwater & stormwater experience.
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Reliable Supply Chain
Direct relationship with Graf ensures consistent availability and product knowledge.
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Proven Track Record
Trusted by municipalities, engineers, and contractors across Western Canada.
WONDERING IF THIS IS THE RIGHT SOLUTION FOR YOUR PROJECT?
Just fill out the form below and our team will help you find the right solution—fast.