Metals
Lithium in U.S. tap water
305 public water systems across 27 U.S. states report Lithium in their annual Consumer Confidence Report. None currently sit at or above the federal limit.
What it is
A naturally occurring element found in some groundwater.
Why it's regulated
No enforceable federal limit; on the EPA contaminant candidate list for further study.
Within the federal limit (20)
| Water system | Measured |
|---|---|
| Chesapeake, VA 2023 annual report | Not detected ng/L |
| City of Fresno — Fresno, Ca, CA 2023 annual report | Not detected ug/L |
| City of Mountain House — Mountain House, Ca, CA 2023 annual report | Not detected |
| City of Red Bluff — Red Bluff, Ca, CA 2023 annual report | Not detected ug/L |
| Coalinga-city — Coalinga, Ca, CA 2023 annual report | Not detected ug/L |
| Dallas, TX 2024 annual report | Not detected ng/L |
| Dearborn, MI 2024 annual report | Not detected ug/L |
| Fairfield, CA 2024 annual report | Not detected |
| Freedom District, MD 2024 annual report | Not detected ug/L |
| Indianapolis, IN 2023 annual report | Not detected |
| Indianapolis, IN 2023 annual report | Not detected |
| Morgan County, IN 2023 annual report | Not detected |
| Sacramento Suburban Water District — Sacramento, Ca, CA 2023 annual report | Not detected ug/L |
| Salem, OR 2023 annual report | Not detected ug/L |
| San Joaquin County - Lincoln Village — Stockton, Ca, CA 2023 annual report | Not detected ug/L |
| Suffolk, VA 2024 annual report | Not detected ug/L |
| Usmc - 29 Palms — Twentynine Palms, Ca, CA 2023 annual report | Not detected |
| Vallejo, CA 2024 annual report | Not detected ug/L |
| Ventura Cwwd No. 1 - Moorpark — Moorpark, Ca, CA 2023 annual report | Not detected |
| Westfield, IN 2023 annual report | Not detected |
Frequently asked
+What is Lithium?
A naturally occurring element found in some groundwater. No enforceable federal limit; on the EPA contaminant candidate list for further study.
+What is the federal limit for Lithium in drinking water?
The federal Public health goal for Lithium is 9 ug/L. The EPA enforces this against the regulated reporting statistic (typically a running annual average or 90th percentile), not a single-sample spike.
+How many U.S. water systems have Lithium over the federal limit?
Zero of the 305 public water systems in The Water Map dataset currently report Lithium at or above its federal limit.
+How can I check if Lithium is in my city's tap water?
Search your city on The Water Map (https://www.thewatermap.com/) or browse the list on this page. Every U.S. public water utility is required to publish an annual Consumer Confidence Report that lists every contaminant it measured, including Lithium.