Inorganic
Mercury in your water
Health effects
Mercury reaches water from natural deposits, industrial runoff, and discarded products. Long-term exposure harms the kidneys and nervous system. It is tightly regulated because of its toxicity at low concentrations.
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)
No health guideline set
Federal legal limit (MCL)
2 ppb
Source: EWG Tap Water Database & EPA MCLs · 2026
What removes Mercury
RO
A.O. Smith · Reverse Osmosis Systems
A.O. Smith AO-US-RO-4000 4-Stage RO
NSF NSF/ANSI 42NSF NSF/ANSI 53NSF NSF/ANSI 58NSF NSF/ANSI 401NSF NSF/ANSI P473
- gpd
- 50
- stages
- 4
- fluoride pct
- 99
$200–$3001yr limited warranty
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Is Mercury in your water?
Check your city's public record, then book a free 30-minute test to confirm what's in your home.