Lithium in U.S. Drinking Water
Find lithium levels reported for your local water system. Search by city, ZIP code, or water supplier, or explore state estimates on the map.
What the research says
This map brings together water-system measurements and clearly labeled estimates. Explore how lithium fits into brain-health research, with the findings and sources explained in these guides:
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 reference level (10 µg/L) and USGS drinking-water-only benchmark (60 µg/L) are reference points, not safety verdicts.
