Lithium
What it is
A naturally occurring metal found in rock and groundwater. EPA has public water systems test for it under its Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) to decide whether it needs a standard.
Your body
There is no federal drinking water limit for lithium. EPA is collecting nationwide data through UCMR 5 to support decisions about possible health effects.
Your home
At drinking-water levels, lithium does not affect plumbing or appliances.
Federal standard: No federal MCL (monitored under UCMR 5)
Treatment options that can reduce it
Research & sources (1)
Maryland water systems that reported lithium
- City of AnnapolisAnne Arundel · 2025 data
- City of CambridgeDorchester · 2025 data
The information on this site is for general education only and is not medical advice. Talk with a qualified health professional about health concerns. Water treatment equipment performance depends on the system, its certification, and proper maintenance.
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