Tap water in the USA, with rare exceptions, is impressively safe.
water-related trend is taking place. ACNielsen tells us that
people may be getting more water through the tap, or through the unit
on their refrigerator/freezer doors.
Tap water is monitored constantly, and the test results made public.
Depending on where you live in the USA, the tap water is drinkable, and in fact very good.
On the other hand, there are many countries where tap water is inherently unsafe to drink.
Tap water is nearly always alkaline and may contain softeners and purifying chemicals.
To determine whether tap water is safe, you must investigate the quality of your present water supply.
Contact your local water supplier and find out where your water comes from, what contaminants it is tested for, and whether any contaminants are present in quantities which pose a health risk to members of your household.
If you have a private water supply, have the water tested periodically by a state/EPA certified drinking water laboratory to determine if the water contains harmful contaminants which cannot be successfully treated.
Your local Cooperative Extension office can provide you with information on testing and treating a well or other private water supply.
"To the people of poor nations, we
pledge to work alongside you to make
your farms flourish and LetCleanWatersFlow, to nourish starved
bodies and feed hungry minds. And to those nations like ours that enjoy
relative plenty, we say we can no longer afford indifference to
suffering outside our borders; nor can we consume the world's resources
without regard to effect. For the world has changed, and we must change
with it". Source: President Obama, Inaugural Speech, January 20, 2009, Washington, DC, USA.