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Best Water Filter for Arsenic (2026)
Arsenic occurs naturally in rock and gets into groundwater. It's common in wells in the Southwest, Upper Midwest and New England. The federal limit is 10 ppb.
Arsenic comes in two forms. Reverse osmosis handles the more common form (arsenic V) well; arsenic III may need pre-oxidation.
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What works
- Reverse osmosis certified for arsenic (NSF/ANSI 58)
- Adsorptive media designed for arsenic
- Distillation
What doesn't
- Standard carbon filters
- Boiling
- Softeners
Our picks
Best match for your water
iSpring RCC7AK Under-Sink Reverse Osmosis System
- Good for: PFAS, nitrate, arsenic, fluoride, radium, lead and most other dissolved contaminants
- Install: Under the kitchen sink, about an hour with basic tools
- Manufacturer lists NSF/ANSI 58 testing. Reverse osmosis is the treatment EPA names as most effective for PFAS.
Bluevua RO100ROPOT Countertop Reverse Osmosis
- Good for: PFAS, nitrate, arsenic and lead without touching the plumbing
- Install: No install; sits on the counter. Good for renters
- Manufacturer lists WQA certification to NSF/ANSI 58.
Lab Water Test Kit for Well Water
- Good for: Finding out what is actually in private well water before buying treatment
- Install: Mail-in sample
- Choose a kit that uses a state-certified lab.
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Questions
Does reverse osmosis remove arsenic?
Yes. RO systems certified to NSF/ANSI 58 for arsenic reduce pentavalent arsenic to below 10 ppb.