Lithium in U.S. Drinking Water
Naturally occurring lithium shows up in tap water at trace levels that vary widely by region and water source. Search a city or state, or explore the map, to see what EPA UCMR5 utility monitoring (2023–2025) measured. Color shows concentration magnitude only, not a health rating.
What the research says
This map reports measurements only. For neutral, sourced explanations of what the science does and doesn't show:
Data: EPA UCMR5 (2023–2025), EPA SDWIS (population), USGS Lindsey 2021 (below-detection calibration). Figures are utility-level and point-in-time, not lifetime exposure and not household-specific. There is no federal regulatory limit (MCL) for lithium; the EPA Health-Based Screening Level (10 µg/L) and drinking-water threshold (60 µg/L) are reference points, not safety verdicts.
