Filter Quality

Find out which contaminants the water filter you already own is certified to reduce, against what your public water system has actually detected.

Certified claims come from manufacturer performance data sheets (NSF/ANSI 42, 53, 58, 401). Detection data comes from EPA UCMR5 and SDWIS. Every number has a source and a date. We do not publish estimated performance.

Building in public — utility PFAS pages are live; filter and result pages are in progress.