Water filters certified to remove Nitrate
Causes 'blue baby syndrome' (methemoglobinemia) in infants under 6 months; MCL 10 mg/L as N. Runoff from fertilizer, septic, manure.
"Certified" means the model is listed in the NSF, WQA, or IAPMO public database as reducing Nitrate — not just "tested to" a standard.
Pick the path that fits you
You can start cheap with a no-install filter, or solve it permanently with an installed system that costs far less per gallon over time. Both options below are certified to reduce Nitrate.
Prices shown are as of August 20, 2026 and may change — check Amazon for the current price. As an Amazon Associate we earn from qualifying purchases; some links are affiliate links and we may earn a commission at no extra cost to you. Disclosure.
Top certified picks with prices
Prices shown are as of August 20, 2026 and may change — check Amazon for the current price. As an Amazon Associate we earn from qualifying purchases; some links are affiliate links and we may earn a commission at no extra cost to you. Disclosure.
8 consumer filters certified to remove Nitrate
Recognizable brands worth shopping. (77 models are certified in total, including commercial, dealer-installed, and OEM units — see the full registry.)
| Filter | Type | Capacity | Price | ¢/gal | |
|---|---|---|---|---|---|
Pentair GRO-350B NSF | REVERSE OSMOSIS | 750 gal | $37.9 | 5.1 | Buy |
GE GNRQ18NBN NSF | REVERSE OSMOSIS | 260 gal | $63.87 | 24.6 | Buy |
GE GXRQ18NBN NSF/IAPMO | REVERSE OSMOSIS | 260 gal | $65 | 24.6 | Buy |
GE GXRV40TBN NSF/IAPMO | REVERSE OSMOSIS | 260 gal | $63.87 | 24.6 | Buy |
iSpring HERO-385PLUS NSF | REVERSE OSMOSIS | 4,500 gal | $339.6 | — | Buy |
A.O. Smith AORO-50 NSF | REVERSE OSMOSIS | — | $83.99 | — | Buy |
Brita Pro BPLRO-35 NSF | REVERSE OSMOSIS | — | — | — | |
Maytag DRINKING WATER SYSTEM MODEL M-550 NSF | REVERSE OSMOSIS | — | — | — |