NSF 58 filters for nitrate
NSF, WQA, or IAPMO listing to NSF/ANSI 58 for Nitrate (as N). Certified is a listing, not a ranking.
Affiliate listings These are paid Amazon links. As an Amazon Associate, Tap and Well earns a commission from qualifying purchases if you buy. Rankings come from the matching engine (certification, flagged contaminants, annual cost), not from who pays more. Affiliate disclosure.
| Product | Certifier | Checked | From |
|---|---|---|---|
| Aquasana OptimH2O Reverse Osmosis + Claryum | NSF | not yet | |
| Aquasana OptimH2O Reverse Osmosis + Claryum | WQA | 2026-09-14 | |
| AquaTru Classic Countertop Reverse Osmosis Purifier | IAPMO | not yet |