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. The EPA also sets a non-enforceable health goal (MCLG) of 0 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 EPA health goal (MCLG) is the level below which no health risk is expected — it is non-enforceable and often stricter than the legal limit.
EPA health goal (MCLG)
0 ppb
Federal legal limit (MCL)
10 ppb
Source: EPA National Primary Drinking Water Regulations (MCL / MCLG) · 2026
What removes Arsenic
Where Arsenic has been found
Arsenic shows up in the public water record for these cities. Each page has the measured level, the legal limit, and what removes it.
- 1
See your Water Score
Free, instant, no signup.
- 2
Get your custom fix-it plan
Exactly what your water needs.
- 3
Request your free water test
Availability varies by location; no obligation to buy.
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.