
City water is treated, but that doesn’t mean it’s pure by the time it hits your tap. Think of municipal treatment as “safe enough for everyone,” not “optimized for your home.”
City water is "safe", but filtration makes it:
Depends on your goals:
EPA limits are about population-level safety, not zero exposure.
Examples:
Even if water leaves the treatment plant clean, it still has to travel through:
That can introduce:
Filtration protects you from what happens after treatment, not before.

A List of these contaminants include: Bacteria: E. coli, Salmonella, Legionella, Viruses: Norovirus, Hepatitis A, Protozoa: Giardia, Cryptosporidium
This can usually controlled with chlorine or UV treatment, but outbreaks can happen. But the main concerns with any of these being in your water is illness for those in the household

Trihalomethanes (THMs) Haloacetic acids (HAAs)
These byproducts are formed when chlorine reacts with natural organic matter in water. This is linked to long-term health risks.

Calcium and magnesium – not harmful, but cause scale and soap inefficiency. Along with other annoyance such as dry skin and hair with no volume.
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