Tap water is held to higher standards than any bottled water here's the explanation....

I still use a PUR water filter to reduce the contaminants even more but....

Tap Water vs. Bottled Water: Regulatory Standards for Impurities

Regulatory Oversight

Tap water in the United States is regulated by the Environmental Protection Agency (EPA), which imposes strict standards for a wide range of contaminants and requires frequent testing and public reporting3 710.
Bottled water is regulated by the Food and Drug Administration (FDA), which generally adopts standards similar to the EPA’s for chemical, physical, microbial, and radiological contaminants2 69.

Testing Frequency and Transparency

Tap water providers must test for contaminants far more frequently than bottled water producers and are required to report results to the public annually via Consumer Confidence Reports (CCRs)310. These reports detail detected contaminants and compliance with EPA standards.
Bottled water companies are not required to disclose detailed testing results to consumers and are subject to less frequent testing and weaker public notification requirements3 57.

Enforcement and Safety Requirements

Feature	Tap Water (EPA)	Bottled Water (FDA)
Testing Frequency	Frequent, often daily or weekly	Less frequent, sometimes weekly or annually2 5
Public Reporting	Mandatory annual reports to consumers3 10	No public reporting requirement3 5
E. coli Standard	No confirmed E. coli or fecal coliform allowed5	Some bacteria allowed in certain cases5
Operator Certification	Required for water system operators5	Not required for bottled water plant operators5
Recall Mechanism	No recall for distributed tap water4	Recalls possible for contaminated bottled water4

Contaminant Standards

Both tap and bottled water must meet similar maximum contaminant levels for many substances, but enforcement and transparency differ2 610.
Studies have found that bottled water can sometimes contain more contaminants—including microplastics, heavy metals, and chemicals—than tap water, partly due to less rigorous oversight and disclosure1 37.
About 64% of bottled water sold in the U.S. is sourced from municipal tap water, often with minimal additional treatment17.

Conclusion

Local tap water is generally held to higher standards for testing, transparency, and public notification regarding impurities than bottled water. While the legal contaminant limits are similar, the frequency of testing, enforcement, and consumer right-to-know requirements are stricter for tap water3 510. Bottled water is not necessarily purer or safer and is often less transparent about its quality and source1 3 710.

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