Arsenic
EPA MCLG
0 mg/L
EPA's health goal is zero — no known safe level of exposure. This is a goal, not an enforceable limit.
Health Effects
Skin damage or problems with circulatory systems, and may have increased risk of getting cancer
Source: EPA — National Primary Drinking Water Regulations (retrieved 2026-07-27)
On a private well?
This page covers Arsenic in public water systems. Private wells are unregulated and not tested by anyone unless you arrange it.
Arsenic in private well water →Common Sources
- Erosion of natural deposits
- runoff from orchards, runoff from glass and electronics production wastes
Is your Arsenic result safe? Get a free reading
The EPA MCLG for Arsenic is 0 mg/L. Upload your water test (PDF or a photo) and we'll email a plain-English reading of where your result lands — and every other number — free. Educational only, no medical claims.
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Where is Arsenic Found?
Arsenic has been detected above EPA health guidelines in 1,576 cities serving 30.0M people across the US.
and 1,571 more cities
About the EPA MCLG
The EPA MCLG is the level of a contaminant in drinking water below which there is no known or expected risk to health. It is a non-enforceable public health goal, and is often stricter than the legal limit (MCL) water systems must meet.
Contaminant Type
Arsenic is classified as a Metals contaminant.
Check Your Water
Find out if Arsenic is in your tap water.
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