Certified to remove
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.
77
certified models
11
with current prices
"Certified" means the model is listed in the NSF, WQA, or IAPMO public database as reducing Nitrate — not just "tested to" a standard.
Two ways to fix it
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.
Top certified picks with prices
All 77 certified filters
| Filter | Type | Capacity | Price | ¢/gal | |
|---|---|---|---|---|---|
Soft Water Supply North Star NSRO42C4 NSF | Under-sink | 3,850 gal | $65.99 | 1.7 | Buy |
EcoPure ECOP30 NSF | Under-sink | 3,850 gal | $219.99 | 6.2 | Buy |
GE GNRQ18NBN NSF | Under-sink | 260 gal | $63.87 | 24.6 | Buy |
GE GXRQ18NBN NSF/IAPMO | Under-sink | 260 gal | $65 | 24.6 | Buy |
GE GXRV40TBN NSF/IAPMO | Under-sink | 260 gal | $63.87 | 24.6 | Buy |
Soft Water Supply North Star NSROPS NSF | Under-sink | 3,850 gal | $65.99 | — | Buy |
Microline T.F.C.-435 NSF | Under-sink | — | $66.89 | — | Buy |
Microline T.F.C.-435FFSX NSF | Under-sink | — | $66.89 | — | Buy |
Microline T.F.C.-435FSX NSF | Under-sink | — | $66.89 | — | Buy |
Microline T.F.C.-435RC NSF | Under-sink | — | $66.89 | — | Buy |
Microline T.F.C.-435X NSF | Under-sink | — | $66.89 | — | Buy |
Pentair GRO-350B NSF | Under-sink | 750 gal | — | 5.1 | |
Solventum 3MRO501 NSF | Under-sink | 1,500 gal | — | 13.8 | |
EcoWater Systems ERO-385 NSF | Under-sink | 4,500 gal | — | — | |
EcoWater Systems ERO-385-BN NSF | Under-sink | 4,500 gal | — | — | |
EcoWater Systems ERO-385-CP NSF | Under-sink | 4,500 gal | — | — | |
EcoWater Systems ERO-385E NSF | Under-sink | 4,500 gal | — | — | |
EcoWater Systems ERO-385E-BN NSF | Under-sink | 4,500 gal | — | — | |
EcoWater Systems ERO-385E-CP NSF | Under-sink | 4,500 gal | — | — | |
EcoWater Systems HERO-385-BN NSF | Under-sink | 4,500 gal | — | — | |
EcoWater Systems HERO-385-CP NSF | Under-sink | 4,500 gal | — | — | |
EcoWater Systems HERO-385PLUS NSF | Under-sink | 4,500 gal | — | — | |
Brita Total360 BRDROS NSF | Under-sink | 3,850 gal | — | — | |
Water Channel Partners Ecodyne ELXROTU NSF | Under-sink | 3,850 gal | — | — | |
Whirlpool WHAPSRO NSF | Under-sink | 3,850 gal | — | — | |
Whirlpool WHAROS5 NSF | Under-sink | 3,850 gal | — | — | |
Whirlpool WHER25 NSF | Under-sink | 3,850 gal | — | — | |
A.O. Smith AORO-50 NSF | Under-sink | — | — | — | |
Aqua Systems AQPC-35 NSF | Under-sink | — | — | — | |
Aqua Systems AQPC-435 NSF | Under-sink | — | — | — | |
Aqua Systems S33201-PL6-AS NSF | Under-sink | — | — | — | |
AQUA TREATMENT SERVICE ATS-PRO50-4 NSF | Under-sink | — | — | — | |
Atlantic HR-35-TFC-4W NSF | Under-sink | — | — | — | |
Capital Water Softener Aqua Bella CP-TFC-M50-RO NSF | Under-sink | — | — | — | |
Capital Water Softener Aqua Bella CP-TFC-NM50-RO NSF | Under-sink | — | — | — | |
Charger Water Treatment Products CWQC50 NSF | Under-sink | — | — | — | |
Charger Water Treatment Products ClearConnect QC50 NSF | Under-sink | — | — | — | |
Frakco AM4QC NSF | Under-sink | — | — | — | |
Griesbach 78-0036-XX NSF | Under-sink | — | — | — | |
Hellenbrand MILLENNIUM PRO S33101-PL6-HB NSF | Under-sink | — | — | — | |
Hellenbrand MILLENNIUM PRO S33201-PL6-HB NSF | Under-sink | — | — | — | |
Hellenbrand Millennium MRO-35 NSF | Under-sink | — | — | — | |
Hellenbrand Millennium MRO-35GF NSF | Under-sink | — | — | — | |
Hydronix Water Technology Hydro Guard HDGT-45XX NSF | Under-sink | — | — | — | |
Hydronix Water Technology HDGT-TW50 C NSF | Under-sink | — | — | — | |
Brita Pro BPLRO-35 NSF | Under-sink | — | — | — | |
Lancaster Water Treatment CRO-350 NSF | Under-sink | — | — | — | |
Lancaster Water Treatment LRO-35 NSF | Under-sink | — | — | — | |
Lancaster Water Treatment PRO-50 NSF | Under-sink | — | — | — | |
Marlo Incorporated TFC-35 NSF | Under-sink | — | — | — | |
Marlo Incorporated TFC-35M NSF | Under-sink | — | — | — | |
Master Water Conditioning Puro-35T NSF | Under-sink | — | — | — | |
Microline T.F.C.-335 NSF | Under-sink | — | — | — | |
Microline T.F.C.-335FS NSF | Under-sink | — | — | — | |
Microline T.F.C.-335FSX NSF | Under-sink | — | — | — | |
Microline T.F.C.-335X NSF | Under-sink | — | — | — | |
Microline T.F.C.-3PL NSF | Under-sink | — | — | — | |
Microline T.F.C.-3PLX NSF | Under-sink | — | — | — | |
Microline T.F.C.-4PL NSF | Under-sink | — | — | — | |
Microline T.F.C.-4PLF NSF | Under-sink | — | — | — | |
Microline T.F.C.-4PLX NSF | Under-sink | — | — | — | |
R.E. Prescott Co ELP50-4 NSF | Under-sink | — | — | — | |
Rayne RaynePure Plus NSF | Under-sink | — | — | — | |
Reynolds Water Conditioning QT-4 NSF | Under-sink | — | — | — | |
Senwater Systems DRO512 NSF | Under-sink | — | — | — | |
Senwater Systems TRO508 NSF | Under-sink | — | — | — | |
Senwater Systems TRO510 NSF | Under-sink | — | — | — | |
The LeverEdge AvantaPure RO-450 NSF | Under-sink | — | — | — | |
The LeverEdge MAYTAG DRINKING WATER SYSTEM MODEL M-550 NSF | Under-sink | — | — | — | |
The LeverEdge Pro Elite RO-450 NSF | Under-sink | — | — | — | |
The LeverEdge Pro Elite RO-450 With Monitor NSF | Under-sink | — | — | — | |
The LeverEdge Westinghouse Drinking Water System A-450 NSF | Under-sink | — | — | — | |
The LeverEdge Westinghouse Drinking Water System D-550 NSF | Under-sink | — | — | — | |
The LeverEdge Westinghouse Drinking Water System P-550 NSF | Under-sink | — | — | — | |
The LeverEdge Westinghouse Drinking Water System R-450 NSF | Under-sink | — | — | — | |
Water-Right UltroWater NSF | Under-sink | — | — | — | |
Water-Right WRO-35 NSF | Under-sink | — | — | — |