The Romans managed to figure out that lead was bad for you. That didn’t stop it from being used for the next 1500 years. Including in gasoline. And in paint.
Up until recently, a lot of US plumbers used lead pipes in homes to bring drinking water to the faucet. Even if home lead plumbing is replaced, the pipes leading to the water meter may be lead.
The Romans managed to figure out that lead was bad for you. That didn’t stop it from being used for the next 1500 years. Including in gasoline. And in paint.
https://www.epa.gov/archive/epa/aboutepa/lead-poisoning-historical-perspective.html
Up until recently, a lot of US plumbers used lead pipes in homes to bring drinking water to the faucet. Even if home lead plumbing is replaced, the pipes leading to the water meter may be lead.
https://www.epa.gov/ground-water-and-drinking-water/protect-your-tap-quick-check-lead-0