Water · Best-of
Best Water Filter for Well Water
Bottom line
For well water, look for a system with a sediment pre-filter and the contaminant certification your well test calls for - reverse osmosis covers the widest range.
If you're on a private well, start here: the EPA doesn't cover wells, so no utility is testing your water for you - that job is yours. Well water often carries grit and hardness, and sometimes arsenic or nitrates, which is why a sediment pre-filter (a coarse first stage that catches particles) plus the right contaminant certification matters more than it would on city water. The most useful move is to test your well first, then pick the filter that matches what the test actually finds.
How we score: We surface the units that either include a sediment pre-filter or are explicitly rated for well and hard-water sources, then rank them by overall score.
- 17.5AquaTru Classic Countertop RO
The AquaTru Classic Countertop RO is a ro water filter. It is third-party certified (IAPMO) to reduce lead, PFOA, PFOS, fluoride, arsenic, chromium-6, nitrate, chlorine taste and odor, chloramine, VOCs, microplastics. Running cost works out to about $0.287 per gallon.
- Certified to reduce: lead, PFOA, PFOS, fluoride, arsenic, chromium-6, nitrate, chlorine taste and odor, chloramine, VOCs, microplastics
- Cartridge life: 600 gallons
- Cost per gallon: $0.287
- 26.8Frizzlife SK99 Under-Sink Filter
The Frizzlife SK99 Under-Sink Filter is a under sink water filter. It is third-party certified (IAPMO) to reduce chlorine taste and odor, lead, VOCs, sediment, cysts. It is also marketed for chloramine, mercury, cadmium, fluoride, PFOA, PFOS, for which we found no accredited third-party certification (so we award no certification credit; this is not a finding that it fails to reduce them). Running cost works out to about $0.031 per gallon.
- Certified to reduce: chlorine taste and odor, lead, VOCs, sediment, cysts
- Cartridge life: 1,600 gallons
- Cost per gallon: $0.031
- 36.6Waterdrop G3P800 Tankless RO
The Waterdrop G3P800 Tankless RO is a ro water filter. It is third-party certified (IAPMO) to reduce chlorine taste and odor, total dissolved solids (TDS), lead, fluoride, cadmium, chromium-6, selenium, arsenic, nitrate, mercury, copper, barium, PFOA, PFOS. Running cost works out to about $0.123 per gallon.
- Certified to reduce: chlorine taste and odor, total dissolved solids (TDS), lead, fluoride, cadmium, chromium-6, selenium, arsenic, nitrate, mercury, copper, barium, PFOA, PFOS
- Cartridge life: 2,200 gallons
- Cost per gallon: $0.123
- 46.1iSpring RCC7 5-Stage RO
The iSpring RCC7 5-Stage RO is a ro water filter. It is third-party certified (NSF) to reduce total dissolved solids (TDS). It is also marketed for lead, fluoride, arsenic, cadmium, chromium, copper, selenium, chlorine taste and odor, PFAS, for which we found no accredited third-party certification (so we award no certification credit; this is not a finding that it fails to reduce them). Running cost works out to about $0.024 per gallon.
- Certified to reduce: total dissolved solids (TDS)
- Cartridge life: 547,500 gallons
- Cost per gallon: $0.024
- 54.9Express Water RO5DX 5-Stage RO
The Express Water RO5DX 5-Stage RO is a ro water filter. It carries no accredited NSF, WQA, or IAPMO certification - its contaminant claims are "tested to" lab results, not certifications. It is also marketed for lead, arsenic, fluoride, chromium, mercury, uranium, radium, chlorine taste and odor, chloramine, total dissolved solids (TDS), for which we found no accredited third-party certification (so we award no certification credit; this is not a finding that it fails to reduce them). Running cost works out to about $0.021 per gallon.
- Certified to reduce: nothing certified (claims are 'tested to' only)
- Cartridge life: 4,380 gallons
- Cost per gallon: $0.021
- 64.3Home Master TMAFC-ERP Artesian RO
The Home Master TMAFC-ERP Artesian RO is a ro water filter. It carries no accredited NSF, WQA, or IAPMO certification - its contaminant claims are "tested to" lab results, not certifications. It is also marketed for chlorine taste and odor, chloramine, lead, fluoride, total dissolved solids (TDS), arsenic, pharmaceuticals, microplastics, for which we found no accredited third-party certification (so we award no certification credit; this is not a finding that it fails to reduce them). Running cost works out to about $0.038 per gallon.
- Certified to reduce: nothing certified (claims are 'tested to' only)
- Cartridge life: 27,375 gallons
- Cost per gallon: $0.038
- 74.0APEC ROES-50 Essence RO
The APEC ROES-50 Essence RO is a ro water filter. It is third-party certified (WQA) to reduce total dissolved solids (TDS). It is also marketed for chlorine taste and odor, lead, arsenic, fluoride, VOCs, for which we found no accredited third-party certification (so we award no certification credit; this is not a finding that it fails to reduce them). Running cost works out to about $0.145 per gallon.
- Certified to reduce: total dissolved solids (TDS)
- Cartridge life: 550 gallons
- Cost per gallon: $0.145
- 83.7SpringWell CF1 Whole House
The SpringWell CF1 Whole House is a whole house water filter. It carries no accredited NSF, WQA, or IAPMO certification - its contaminant claims are "tested to" lab results, not certifications. It is also marketed for chlorine taste and odor, chloramine, VOCs, PFAS, pesticides, herbicides, lead, arsenic, fluoride, for which we found no accredited third-party certification (so we award no certification credit; this is not a finding that it fails to reduce them). Running cost works out to about $0.000 per gallon.
- Certified to reduce: nothing certified (claims are 'tested to' only)
- Cartridge life: 1,000,000 gallons
- Cost per gallon: $0.000
- 93.4Aquasana Rhino EQ-1000 Whole House
The Aquasana Rhino EQ-1000 Whole House is a whole house water filter. It is third-party certified (WQA) to reduce . It is also marketed for chlorine taste and odor, chloramine, sediment, rust, VOCs, herbicides, pesticides, for which we found no accredited third-party certification (so we award no certification credit; this is not a finding that it fails to reduce them). Running cost works out to about $0.001 per gallon.
- Certified to reduce: nothing certified (claims are 'tested to' only)
- Cartridge life: 1,000,000 gallons
- Cost per gallon: $0.001
- 101.7Clearly Filtered 3-Stage Under-Sink
The Clearly Filtered 3-Stage Under-Sink is a under sink water filter. It carries no accredited NSF, WQA, or IAPMO certification - its contaminant claims are "tested to" lab results, not certifications. It is also marketed for chlorine taste and odor, fluoride, lead, PFAS, PFOA, PFOS, arsenic, mercury, chromium, pesticides, pharmaceuticals, VOCs, chloramine, for which we found no accredited third-party certification (so we award no certification credit; this is not a finding that it fails to reduce them). Running cost works out to about $0.198 per gallon.
- Certified to reduce: nothing certified (claims are 'tested to' only)
- Cartridge life: 2,000 gallons
- Cost per gallon: $0.198
FAQ
- Do I need to test my well water first?
- Yes - it's the step that saves you from buying the wrong filter. Wells are unregulated, so a certified lab test is the only way to know what's actually in your water. Once you have that, you match the filter's certification to what the test found.
- Is reverse osmosis good for well water?
- RO handles the broadest range of dissolved contaminants, so it's a strong choice. The catch on a well: pair it with enough sediment pre-filtration, or cloudy water will clog the membrane sooner than it should.