Lead
Cities measured
87
Detected in
87 / 87
Elevated / alert
1
EU limit
5 μg/L
Highest
8.4 μg/L — Beirut
Overview
Lead almost never reaches tap water from the source — it enters from lead service lines connecting streets to buildings, lead solder in older plumbing, and brass fittings. Stockholm replaced most lead service lines by the 1980s, but some older building connections remain, particularly in pre-1960 buildings.
Health Relevance
Lead is a neurotoxin with no safe exposure level. In children, even micro-level exposure causes irreversible cognitive impairment and reduced IQ. In adults, it causes hypertension, renal damage, and reproductive harm. Lead accumulates in bone and can remobilise during pregnancy or osteoporosis.
Regulatory Limits
Drinking Water Directive 2020/2184
10 μg/L (being reduced to 5 μg/L by 2036 under EU Directive 2020/2184).
Controversy & Contested Science
The Flint, Michigan crisis (2014–2019) exposed the consequences of lead pipe complacency. Over 100,000 residents were exposed to elevated lead after a corrosion control failure went unacknowledged. The crisis disproportionately affected Black and low-income communities. Post-Flint analysis revealed similar vulnerabilities in Newark, Pittsburgh, and Washington DC — where a 2004 lead crisis was initially downplayed by the CDC. In Europe, lead service lines remain widespread in France, UK, Germany, and the Netherlands. The EU's 2036 replacement deadline has been criticised as grossly insufficient given the severity of harm.
Note
Ancient Rome used lead pipes extensively (fistulae plumbeae — the origin of the word 'plumber') and lead-lined cooking vessels. Some historians argue chronic lead poisoning contributed to Rome's decline, though the hypothesis is disputed.