Physical & aggregate
Temperature in U.S. tap water
14 public water systems across 8 U.S. states report Temperature in their annual Consumer Confidence Report. None currently sit at or above the federal limit.
What it is
The measured temperature of the water sample.
Why it's regulated
Not regulated for health; warmer water can affect disinfection and microbial growth.
Frequently asked
+What is Temperature?
The measured temperature of the water sample. Not regulated for health; warmer water can affect disinfection and microbial growth.
+Does Temperature have a federal limit in drinking water?
Temperature 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 Temperature over the federal limit?
Zero of the 14 public water systems in The Water Map dataset currently report Temperature at or above its federal limit.
+How can I check if Temperature 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 Temperature.