Inorganic
Arsenic in your water
Health effects
Arsenic is a naturally occurring element that dissolves into groundwater from rock and is also released by mining and industry. Long-term exposure is associated with several cancers and with skin, cardiovascular, and developmental harm. It is common in parts of the Southwest.
The guideline vs. the legal limit
The federal legal limit is the maximum allowed by law. The EWG health guideline is what independent scientists consider safe — it is often far stricter.
Health guideline (EWG)
0.004 ppb
Federal legal limit (MCL)
10 ppb
Source: EWG Tap Water Database & EPA MCLs · 2026
What removes Arsenic
Waterdrop · Reverse Osmosis Systems
Waterdrop G3P800 Tankless RO (800 GPD)
- gpd
- 800
- stages
- 7
- tankless
- true
GE Appliances (Haier) · Reverse Osmosis Systems
GE GXRV40TBN 5-Stage Reverse Osmosis
- gpd
- 14.76
- stages
- 5
- antimicrobial
- true
A.O. Smith · Reverse Osmosis Systems
A.O. Smith AO-US-RO-4000 4-Stage RO
- gpd
- 50
- stages
- 4
- fluoride pct
- 99
APEC Water Systems · Reverse Osmosis Systems
APEC RO-90 Ultimate 5-Stage RO (90 GPD)
- gpd
- 90
- stages
- 5
- membrane
- FILMTEC TFC
Aquasana · Reverse Osmosis Systems
Aquasana OptimH2O Reverse Osmosis + Claryum
- gpd
- 35
- stages
- 3
- fluoride pct
- 95
Aquasana · Reverse Osmosis Systems
Aquasana SmartFlow Reverse Osmosis
- stages
- multi
- tankless
- true
- efficiency
- high-recovery
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Is Arsenic in your water?
Check your city's public record, then book a free 30-minute test to confirm what's in your home.