Inorganic chemicals
Ammonia in U.S. tap water
23 public water systems across 7 U.S. states report Ammonia in their annual Consumer Confidence Report. None currently sit at or above the federal limit.
Within the federal limit (1)
| Water system | Measured |
|---|---|
| Columbus, OH 2025 annual report | Not detected |
Frequently asked
+What is Ammonia?
Ammonia is a contaminant some U.S. public water utilities measure and report in their annual Consumer Confidence Report.
+Does Ammonia have a federal limit in drinking water?
Ammonia 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 Ammonia over the federal limit?
Zero of the 23 public water systems in The Water Map dataset currently report Ammonia at or above its federal limit.
+How can I check if Ammonia 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 Ammonia.