What it is
Zinc is a common metal used to coat steel (galvanising) and in brass. It is an essential nutrient in small amounts and is found naturally at low levels in most water.
Where it comes from
In drinking water zinc almost always comes from galvanised pipes, tanks and fittings, particularly where the water is soft or slightly acidic. Levels are highest in water that has stood in the pipes overnight.
Why it matters
There is no health-based limit for zinc in England; at the levels found in supplies it is not a health concern. Above a few milligrams per litre water tastes metallic or astringent and may look milky when drawn. High zinc often travels with cadmium, which is why both are checked.
What can be done about it
If zinc is high, the usual cause is old galvanised pipework and the fix is to replace it or correct a low pH so the water stops dissolving the coating. Flushing the tap before use reduces the amount in the meantime.
Information last reviewed 5 October 2026 by Pozzani Pure Water.