Metals
Potassium in U.S. tap water
281 public water systems across 14 U.S. states report Potassium in their annual Consumer Confidence Report. None currently sit at or above the federal limit.
What it is
A naturally occurring mineral from rock and soil.
Why it's regulated
Not federally regulated for health.
Within the federal limit (1)
| Water system | Measured |
|---|---|
| City of Milpitas — Milpitas, Ca, CA 2023 annual report | Not detected mg/L |
Potassium by state
Every state where a public water system reports Potassium in its annual report, ranked by systems at or above the federal limit.
Frequently asked
+What is Potassium?
A naturally occurring mineral from rock and soil. Not federally regulated for health.
+Does Potassium have a federal limit in drinking water?
Potassium does not have an enforceable federal MCL. Utilities still report any measured levels in their annual Consumer Confidence Report.
+How many U.S. water systems have Potassium over the federal limit?
Zero of the 281 public water systems in The Water Map dataset currently report Potassium at or above its federal limit.
+Which states report the most Potassium in their drinking water?
No state currently has a system reporting Potassium at or above its federal limit in The Water Map dataset. California, Wisconsin, Missouri have the most systems measuring it.
+How can I check if Potassium 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 Potassium.