Disinfection byproducts
HAA9 in U.S. tap water
7 public water systems across 1 U.S. states report HAA9 in their annual Consumer Confidence Report. None currently sit at or above the federal limit.
Frequently asked
+What is HAA9?
HAA9 is a contaminant some U.S. public water utilities measure and report in their annual Consumer Confidence Report.
+Does HAA9 have a federal limit in drinking water?
HAA9 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 HAA9 over the federal limit?
Zero of the 7 public water systems in The Water Map dataset currently report HAA9 at or above its federal limit.
+How can I check if HAA9 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 HAA9.