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From 2 May 2026, every new building consent in New Zealand must use lead-free plumbing products. This is one of the biggest changes to the Building Code in years, and if you are planning any plumbing work in your home, it is worth understanding what it means.
As a plumber and gasfitter working across Auckland, I wanted to break this down in plain English so you know exactly what is changing, what is not, and what to look for when you hire a plumber.
What Is Changing?
Amendment 14 to Building Code Clause G12 (Water Supplies) introduces strict new limits on lead content in plumbing products that come into contact with your drinking water.
The key rule is simple: any copper alloy product used in contact with drinking water must contain no more than 0.25% lead. That is a major reduction from what was previously allowed.
On top of that, all copper alloy components under hydrostatic pressure (water pressure) must be dezincification-resistant (DZR). Dezincification is a type of corrosion where zinc leaches out of brass fittings into your water supply, leaving a weak, porous copper residue behind. DZR-rated products are designed to resist this.
What Products Are Affected?
The new rules apply to a wide range of plumbing products that come into contact with your drinking water, including:
- Copper alloy pipe fittings
- Isolation valves and backflow prevention valves
- Taps and mixers (kitchen and laundry)
- Water heaters and hot water cylinders
- Water meters
- Pumps
- Stainless-steel braided hoses
- Residential water filtration equipment and water dispensers
- Hose taps
- Fire sprinkler systems connected to cold water supplies
What Is NOT Affected?
Not everything in your bathroom or laundry falls under these rules. The following are exempt:
- Shower heads and bath spouts
- Emergency showers and eyewash stations
- Irrigation systems and pumps
- Toilets and sanitary fixtures
- Washing machines and dishwashers
- Commercial HVAC boilers
- Fire-fighting equipment (separate from cold water supply sprinklers)
How to Check: LF and DR Markings
Compliant products should be marked with two key identifiers:
- LF — lead-free (tested to NSF/ANSI/CAN 372:2020)
- DR — dezincification-resistant (tested to AS 2345:2006)
What About Existing Plumbing Work?
Building consents granted on or before 1 May 2026 are grandfathered under the old rules. From 2 May 2026 onwards, all new consent applications must comply with Amendment 14.
A Note for Plumbers: Brazing and DZR
Brazing brass fittings at high temperatures can compromise DZR. MBIE warns plumbers to avoid localised hot spots and braze at as low a temperature as practicable.
What Should You Do?
- Ask your plumber if they are using lead-free, DZR-compliant products
- Check for LF and DR markings on fittings, valves, and taps
- Request test certificates
- Get your consent timing right
At Water & Gas Worx, we are ready for the change. Our suppliers are already stocking lead-free, DZR-compliant products.
Why Does This Matter?
Lead in drinking water is a serious health risk, particularly for children and pregnant women. These new rules bring NZ in line with international best practice.