Why most New York City drinking water does not need filtration

Mountains naturally filter New York’s water

New York City’s protected Catskill Mountains watershed naturally filters most of its drinking water. The city is one of only four major U.S. cities whose water is pure enough that most of it does not require treatment.

A radioactive atom does not become more likely to decay as it gets older

A radioactive atom has the same chance of decaying at any moment, no matter how old it is. Half-life tells us how a large group of radioactive atoms changes over time. It is not a countdown for each individual atom.

Earth keeps liquid water at its surface

Earth stands out from the other planets because it has large amounts of liquid water on its surface. Other worlds with thick atmospheres do not have stable surface water, while some moons may hold more liquid water than Earth’s oceans beneath kilometers of ice.

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Why most New York City drinking water does not need filtration

Mountains naturally filter New York’s water

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