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Water · Best-of

Best Water Filter for Arsenic

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.

Arsenic occurs naturally in groundwater and is most common in private wells. Ordinary carbon filtration does not reliably remove it; the certified route is reverse osmosis, and certification distinguishes arsenic III from arsenic V. We rank only units with a verifiable arsenic certification.

How we score: We require a verifiable certification covering arsenic reduction (typically NSF/ANSI 58 reverse osmosis), then rank by composite score.

  1. 17.3
    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, pharmaceuticals. 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, pharmaceuticals
    • Cartridge life: 2,200 gallons
    • Cost per gallon: $0.123
  2. 27.2
    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. It is also marketed for 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 $0.287 per gallon.

    • Certified to reduce: lead, PFOA, PFOS, fluoride, arsenic, chromium-6, nitrate, chlorine taste and odor, chloramine, VOCs
    • Cartridge life: 600 gallons
    • Cost per gallon: $0.287

FAQ

Does a regular filter remove arsenic?
Usually not. Most carbon pitchers and faucet filters are not certified for arsenic. Look for a reverse-osmosis system certified to NSF/ANSI 58, and check whether it covers arsenic III, arsenic V, or both.