Believe it or not, the word plumbing comes from the Latin word for lead, "plumbum". Lead in water pipes? Water pipes for drinking? Unfortunately the Romans used it for their elaborate irrigation systems and I've heard the lead poisoning that infected many in the world lead to more than a few cases of insanity.
Suellen Ocean is the author of the historic novels The Celtic Prince and The Lies of the Lion available at Amazon, B&N and Ocean-Hose. http://www.pacificsites.com/~oceanhose/