Physical & aggregate
Temperature in U.S. tap water
18 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.
Temperature by state
Every state where a public water system reports Temperature in its annual report, ranked by systems at or above the federal limit.
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 18 public water systems in The Water Map dataset currently report Temperature at or above its federal limit.
+Which states report the most Temperature in their drinking water?
No state currently has a system reporting Temperature at or above its federal limit in The Water Map dataset. California, Arizona, Michigan have the most systems measuring it.
+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.