Physical & aggregate
Alkalinity in U.S. tap water
355 public water systems across 21 U.S. states report Alkalinity in their annual Consumer Confidence Report. None currently sit at or above the federal limit.
What it is
A measure of the water's capacity to neutralize acids.
Why it's regulated
Not federally regulated for health; relevant to corrosion control and treatment.
Within the federal limit (1)
| Water system | Measured |
|---|---|
| Mojave Pud — Mojave, Ca, CA 2023 annual report | Not detected mg/L |
Frequently asked
+What is Alkalinity?
A measure of the water's capacity to neutralize acids. Not federally regulated for health; relevant to corrosion control and treatment.
+Does Alkalinity have a federal limit in drinking water?
Alkalinity 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 Alkalinity over the federal limit?
Zero of the 355 public water systems in The Water Map dataset currently report Alkalinity at or above its federal limit.
+How can I check if Alkalinity 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 Alkalinity.