Inorganic
Arsenic in your water
Is Arsenic in drinking water dangerous?
It depends on the level and how long you're exposed. The EPA legal limit (MCL) for Arsenic is 10 ppb, but health-based goals (EPA MCLG / WHO) are often stricter, at 0.004 ppb. Meeting the legal limit isn't the same as zero risk — test your water to know your level.
How do you remove Arsenic from water?
Arsenic is treated by Reverse Osmosis. Choose a system independently certified to NSF/ANSI standards to reduce Arsenic, and test your water first to confirm the level.
Source: EPA MCL / MCLG; WHO guidelines; NSF/ANSI · 2026
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 health-based goal vs. the legal limit
The federal legal limit (MCL) is the maximum allowed by law. The health-based goal (EPA MCLG / WHO) is a health target — it is often stricter than the legal limit, and it is not itself a legal limit.
Health-based goal (EPA MCLG / WHO)
0.004 ppb
Federal legal limit (MCL)
10 ppb
Source: EPA MCL / MCLG; WHO guidelines · 2026
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What removes Arsenic
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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.