2026 Data
UK Postcodes With the Highest Lead Levels
Which UK postcodes have the highest lead levels in drinking water? Data from Environment Agency monitoring.
According to TapWater.uk's analysis of 2,245 UK postcodes, the highest reading was 0.49 mg/L.
0.49
Highest found
0.00129
UK average
0.01
UK limit
Top 50 postcodes
Ranked by lead. Click any postcode for the full breakdown.
Based on Environment Agency water quality monitoring. Values show the most recent lead reading for each postcode district.
What this means
Lead is a toxic heavy metal with no safe level of exposure. Even low concentrations can cause neurological damage, particularly in children. The UK reduced its legal limit from 0.025 mg/L to 0.01 mg/L in 2013 to align with WHO guidelines. Most lead contamination comes from old lead pipes rather than the water supply itself.
How to protect yourself
A reverse osmosis system or activated carbon filter certified to NSF/ANSI 53 can remove over 99% of lead from drinking water.
Check your postcode
See the full water quality report for your area, including all tested contaminants and personalised filter recommendations.
Frequently asked questions
What is the safe limit for lead in drinking water?
The UK legal limit for lead in drinking water is 0.01 mg/L (10 micrograms per litre). The WHO recommends keeping lead as low as reasonably practicable, as there is no known safe level of exposure to lead.
Why is lead found in UK tap water?
Lead in UK tap water typically comes from old lead service pipes connecting properties to the water main. Homes built before 1970 are most likely to have lead pipes. Water companies treat water to reduce lead dissolving from pipes, but replacement is the only permanent solution.
How can I reduce lead in my tap water?
You can reduce lead exposure by running the tap for 30 seconds before use (especially in the morning), using a water filter certified to remove lead (such as a reverse osmosis system), or arranging for your water company to replace lead service pipes.
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