Metals
Sodium in U.S. tap water
494 public water systems across 37 U.S. states report Sodium in their annual Consumer Confidence Report. None currently sit at or above the federal limit.
What it is
A naturally occurring salt component.
Why it's regulated
Not federally regulated for health; relevant for people on sodium-restricted diets.
Frequently asked
+What is Sodium?
A naturally occurring salt component. Not federally regulated for health; relevant for people on sodium-restricted diets.
+What is the federal limit for Sodium in drinking water?
The federal NL for Sodium is 100 mg/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 Sodium over the federal limit?
Zero of the 494 public water systems in The Water Map dataset currently report Sodium at or above its federal limit.
+How can I check if Sodium 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 Sodium.