Copper Water Test Results Guide

What this test measures

This test measures copper, which almost always comes from your own pipework rather than the supply. Blue-green staining around taps and a metallic taste are the tell-tale signs, especially in newer plumbing or where water has sat overnight.

The UK standard

UK drinking water regulations set 2 mg/l for copper at the tap. Levels are usually highest in the first draw of the morning, after water has sat in copper pipes overnight.

Reading your strip

Dip a strip into your sample for two seconds, hold it level and wait 30 seconds. Match the copper pad against the colour chart on your instructions card and read off the closest band. Strips give you a clear range rather than a lab-precise number — exactly what you need for spotting problems and tracking changes over time.

What to do next

• Confirm it first. One strip is a snapshot — re-test with a fresh strip and a fresh sample before acting on a result.
• Compare a first-draw sample against one taken after running the tap for a minute — a big difference points at your own pipework.
• As a simple habit, run the tap briefly before drinking when water has stood for hours.
• If a reading on a mains supply stays above the standard after re-testing, contact your water supplier — they investigate quality concerns free of charge.
• Thinking about a filter? Test before and after fitting it so you can see exactly what it changed.