Reader's Digest recently conducted a survey entitled "The Fifty Cleanest Cities in America." Its final list was based on a number of factors, including drinking water quality. Here are the cities that scored a perfect 50 points for water quality:

Portland, San Jose, Buffalo, Columbus, San Francisco, Denver, San Diego, Sacramento, Las Vegas, Salt Lake City, and Riverside (CA).

While it's always a good idea to inquire about the quality of your local municipal water supply, the United States has some of the cleanest drinking water in the world. The Safe Drinking Water Act of 1974 set standards for approximately 90 contaminants in drinking water.

If you're interested in learning more about the drinking water in your community, the Environmental Protection Agency hosts a collection of annual drinking water reports, organized by region. You can also investigate your local drinking water specifics with this interactive map.

While researching this topic, we came across a number of interesting articles examining the relative cleanliness of bottled water. As it turns out, approximately thirty percent of bottled water sold in the United States comes from municipal sources (i.e., it's somebody's tap water).

Here are the cities that scored a perfect 50 points for water quality:

Portland

San Jose

Buffalo

Columbus

San Francisco

Denver

San Diego

Sacramento

Las Vegas

Salt Lake City

Riverside (CA)