Photographs, figures and/or graphics that may illustrate this article are visible in the printed or .pdf file version of the article only. For the link to the .pdf file, go to the end of the page. For a printed copy, please make a request at info@wcponline.com. Be sure to include the article title, author(s) name(s), the issue, your name and fax number or full address in the email.

Unless you're a centenarian, you probably don't remember a time when it was considered safe to drink untreated water from open wells.