Metals
Silica in U.S. tap water
51 public water systems across 9 U.S. states report Silica in their annual Consumer Confidence Report. None currently sit at or above the federal limit.
What it is
A naturally occurring compound from sand and rock.
Why it's regulated
Not federally regulated for health; relevant mainly for industrial water use.
Within the federal limit (1)
| Water system | Measured |
|---|---|
| West Jordan, UT 2024 annual report | Not detected mg/L |
Frequently asked
+What is Silica?
A naturally occurring compound from sand and rock. Not federally regulated for health; relevant mainly for industrial water use.
+Does Silica have a federal limit in drinking water?
Silica 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 Silica over the federal limit?
Zero of the 51 public water systems in The Water Map dataset currently report Silica at or above its federal limit.
+How can I check if Silica 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 Silica.