Enforceable limit · MCLFederal · public water systems
400 ppb
The highest level allowed in water a public system delivers. A legal limit, not a health goal.
- Applies to
- Water delivered by public water systems, not private wells
- Status
- In force
- Source
- EPA NPDWR MCL (0.4 mg/L) · 40 CFR §141.61(c)