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Best Water Filter for Arsenic

Bottom line

The best water filter for arsenic is a reverse-osmosis system certified to reduce it - check whether your water carries arsenic III or V, and confirm the certification covers it.

If you're filtering for arsenic - most likely if you're on a private well, since it occurs naturally in groundwater - know two things up front. First, ordinary carbon filtration won't reliably remove it; the certified route is reverse osmosis (RO). Second, arsenic comes in two forms, arsenic III and arsenic V, and a certification tells you which one a filter actually covers. We rank only units with a verifiable arsenic certification.

How we score: A filter needs a verifiable certification covering arsenic reduction (usually NSF/ANSI 58 reverse osmosis) before it's eligible - then we rank what qualifies by overall score.

  1. 17.5
    AquaTru 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
  2. 26.6
    Waterdrop 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

FAQ

Does a regular filter remove arsenic?
Usually not - most carbon pitchers and faucet filters aren't certified for arsenic, so don't assume yours handles it. Look instead for a reverse-osmosis system certified to NSF/ANSI 58, and check whether it covers arsenic III, arsenic V, or both, since that determines whether it matches your water.

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