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From EPA’s own records.Every utility, by state
Checked against certifiers’ own listings.Every filter
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What is in your tap water by ZIP code, from EPA’s and the states’ records: the NSF/ANSI standard that handles each contaminant, and the filters certified to it.

Where the data comes from

EPA SDWIS, 2026 Q3
EPA UCMR 5, file of Oct. 15, 2026
EPA compliance results, 2012 to 2019
27 states’ own results, and CDC’s for 13 more
EPA service area map, version 3.0
Rebuilt Oct. 18, 2026

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TapBuff earns a commission when you buy through some links on this site. It never changes which standard we name or what a page says, and it costs you nothing. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money. TapBuff is published for readers in the United States. Data is public record from the U.S. Environmental Protection Agency; TapBuff is not affiliated with EPA, NSF or any utility.

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