Removing an asbestos cement water tank is not a standard DIY job — in most cases it must be handled by a licensed asbestos removalist, and even where limited DIY is technically permitted, strict safety rules apply. Before you touch anything, read this guide carefully and check with your local council and WorkSafe NZ.
Why Asbestos Cement Water Tanks Are Hazardous
Asbestos cement (often called fibrolite or AC sheet) was widely used in New Zealand for water tanks, roofing, and cladding up until the late 1980s. These tanks contain chrysotile (white) asbestos fibres bonded into cement. When the material is in good condition and left undisturbed, the risk is relatively low. However, cutting, drilling, breaking, or even rough handling can release microscopic fibres into the air. Inhaling asbestos fibres is a serious long-term health risk, linked to mesothelioma and asbestosis.
Is This Restricted Work Under NZ Law?
Yes — asbestos removal in New Zealand is regulated under the Health and Safety at Work (Asbestos) Regulations 2016. Here's how the rules break down:
| Asbestos Type | Area Threshold | Who Can Remove It |
|---|---|---|
| Friable asbestos (crumbly, loose) | Any amount | Class A licensed removalist only |
| Non-friable (bonded) asbestos — e.g. AC tank in good condition | Less than 10 m² | Homeowner may do this on their own home (not a rental) |
| Non-friable asbestos | 10 m² or more | Class B (or A) licensed removalist required |
An old asbestos cement water tank can easily exceed 10 m² of surface area once you account for all sides, the base, and the lid. Measure carefully before assuming you can do this yourself. If in doubt, engage a licensed professional.
Note: These rules apply to owner-occupiers working on their own home. If the property is a rental, all asbestos removal must be done by a licensed removalist regardless of size — this is also relevant under Healthy Homes standards.
Steps If You Are Legally Permitted to Remove It Yourself
If the tank is non-friable, in reasonable condition, and under 10 m² on your own owner-occupied home, follow these steps carefully:
1. Assess the Condition First
Do not proceed if the tank is cracked, crumbling, or heavily weathered. Deteriorated material is closer to friable and should be treated as such — call a Class A licensed removalist.
2. Get the Right PPE
- P2 (or P3) half-face respirator — not a dust mask
- Disposable coveralls (Tyvek-style), gloves, and safety glasses
- Disposable boot covers
3. Wet the Surface
Before any handling, thoroughly wet the tank with a fine water mist. Keep it wet throughout the process. This suppresses fibre release. Do not use a high-pressure hose.
4. Remove in Whole Pieces Where Possible
Avoid breaking, cutting, or drilling the tank. Carefully disconnect any plumbing fittings (note: plumbing disconnection may be restricted work under the Plumbers Gasfitters & Drainlayers Board rules — check before disconnecting). Lift the tank intact if at all possible.
5. Double-Bag and Label for Disposal
Wrap the tank in two layers of heavy-duty polythene sheeting (heavy-duty polythene sheeting — check WorkSafe guidance for the current minimum thickness requirement), seal with tape, and label clearly: "CAUTION — ASBESTOS WASTE". Do not place in your general rubbish.
6. Dispose of It Legally
Contact your local council to find an approved asbestos waste disposal facility. Most councils have specific drop-off requirements and fees. Never dump asbestos waste illegally — this carries serious penalties under NZ law.
7. Clean Up Properly
Decontaminate tools and yourself before removing PPE. Place used coveralls, gloves, and boot covers into a sealed plastic bag for disposal with the asbestos waste. Shower immediately after.
Plumbing Connections — A Note on Restricted Work
If your water tank has live plumbing connections, disconnecting pipework may constitute restricted sanitary plumbing work under NZ law. Only a licensed plumber can legally carry out this work. Find a qualified plumber on tradedirectory.co.nz or verify their licence at the PGDB.
Do You Need a Building Consent?
Removing a water tank is generally not a consented activity under Schedule 1 of the Building Act 2004, but rules vary. Always confirm with your local council before starting work, especially if the tank is connected to a building structure or rainwater collection system.
When to Call a Professional
You should always engage a WorkSafe NZ-notified, licensed asbestos removalist if:
- The tank surface area is 10 m² or more
- The tank is cracked, crumbling, or deteriorated
- The property is a rental
- You are unsure about the condition or type of asbestos
- You don't have access to proper PPE and disposal arrangements
A licensed Class B or Class A asbestos removalist will have the correct equipment, training, and legal authority to handle the job safely. You can find qualified asbestos removal specialists in your area on tradedirectory.co.nz.
Sources & Further Reading
- WorkSafe NZ — Asbestos guidance for homeowners
- MBIE Building Performance — Building consent information
- Tenancy Services — Healthy Homes standards
- Plumbers Gasfitters & Drainlayers Board — Licensed tradespeople
- BRANZ — NZ building research and guidance
- Standards NZ — Health and Safety at Work (Asbestos) Regulations
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