San Francisco Department of Public Health's "Bottled Water vs Tap Water: Making a Healthy Choice"

"...Often bottled water is shipped from distant sources, or imported from foreign countries, thus, bottled water increases fossil fuel consumption, greenhouse gas emissions, and air pollution. Car trips taken to the store to purchase bottled water also increase use of fossil fuels and decrease local air quality. Use of bottled water also increases solid waste due to discarded plastic containers. Although most water is sold in recyclable plastic containers, not all of the containers are recycled and a portion inevitably end up in the landfill. Another environmental consideration is the fact that the EPA mandates that municipal water treatment facilities manage and protect the watersheds from which they draw their water. FDA only mandates that the source of the bottled water be protected but says nothing about the watershed as a whole..."