Chlorine (Free)
EPA MRDLG
4 mg/L
The level in drinking water below which there is no known or expected risk to health. This is a goal, not an enforceable limit.
Health Effects
Eye/nose irritation; stomach discomfort
Source: EPA — National Primary Drinking Water Regulations (retrieved 2026-07-27)
Common Sources
- Water additive used to control microbes
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About the EPA MRDLG
The EPA MRDLG (maximum residual disinfectant level goal) is the level of a drinking water disinfectant below which there is no known or expected risk to health. It is a non-enforceable public health goal; the enforceable limit water systems must meet is the MRDL.
Contaminant Type
Chlorine (Free) is classified as a Disinfectants contaminant.
Related Disinfectants Contaminants
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Tests for disinfection byproducts formed when chlorine reacts with organic matter in water treatment.
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