You might want to rethink filling your kettle with hot water form the tap. There was an article in the New York Times a few weeks ago alerting us to the potential dangers of using hot tap water. Seems that when the water is hot there is more chance that hot water dissolves contaminants more quickly.
Did you know that even new pipes that are called "lead free" they can contain 8% lead? The EPA is suggesting that cold tap water should always be used for preparing baby formula, cooking and drinking. It also warns that boiling water does not remove lead but can actually increase its concentration. More information is at www.epa.gov/lead or (800) 424-5323 (LEAD).
If you are truly concerned or curious, you can always order a full test of what is in your water.