Do You Really Need a Water Filter?
Briefly

All sorts of nasties—lead, mercury, radium, nitrates, norovirus, agricultural runoff, PFAS, and more—can lurk in your water. Depending on what you choose, a water filter can cost you tens of dollars, or thousands.
Plenty of public systems produce clean water, but contamination can occur at various points, like rooftop tanks, old pipes, industrial or agricultural runoff, and seasonal changes.
The Safe Water Drinking Act establishes minimum water quality standards, but variations can still occur due to infrastructure issues, agricultural practices, and weather conditions.
Read at time.com
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