If you’ve worked with copper, you’ve probably noticed that it turns green over time.
Whether you’ve seen it on old pipework, roofing, or iconic structures like the Sydney Opera House, it’s a common sight — but is it a cause for concern when it comes to drinking water.
Let’s break it down — what is it, why is it happening, and what can you do about it.
Why Copper Pipes Turn Green
That green tinge on copper pipes is caused by oxidation — a natural chemical reaction between copper, oxygen, carbon dioxide, and water. When these elements interact, copper forms a compound called copper carbonate, often referred to as patina.
This green layer may look concerning, but it actually acts as a protective barrier that helps prevent further corrosion of the pipe.
Think of it like armour — unattractive maybe, but functional.
A green patina has formed on the copper rib detail of the Sydney Opera House.
Is Green Copper Safe for Potable Water?
Here’s the good news: in most cases, yes — oxidised copper is still safe for transporting drinking water, as long as the corrosion is not excessive.
In fact, the patina helps prevent too much copper from leaching into the water. However, if the pipe appears heavily corroded, pitted, or damaged, it’s time to call in a licensed plumber.
When to Worry:
- Pipes exposed to salt air or harsh chemicals
- Noticeable green water staining at outlets
- Signs of pinholes or leaks
How Long Does Copper Plumbing Last?
While copper is tough, it’s not immortal. Over time, environmental factors — like humidity, pollutants, and salinity — can break it down. That’s why many plumbers are now replacing old systems with copper press fittings.
Copper press is a faster, cleaner, and more economical way to join copper pipe — no flames, no flux, just a secure mechanical joint. Perfect for retrofits, maintenance, and time-sensitive jobs.
Austec Press copper fittings, approved for use on both water and gas lines.
Austec Supplies Copper Press Fittings Across Australia
We supply quality copper press fittings to plumbers all over Sydney and beyond. Whether you’re replacing corroded copper, retrofitting a building, or installing a new system, we’ve got you covered — fast, direct, and competitively priced.
Need a price list or some advice? Call the team at Austec on (02) 9604 2774 or send us a message here.
