Lots of lead pots and pans used for preparing food and storing drinking water.
Excellent point. That's it.
The canning process for food preservation was developed in the late 18th and early 19th century and metallic cans caught on rapidly as a means of food preservation (many of the soldiers at the Battle of Waterloo took rations from metal cans.) At that time, the solder used to seal the cans had a very high lead content which was prone to leach into the foodstuffs.