Microbial
Cryptosporidium in U.S. tap water
36 public water systems across 10 U.S. states report Cryptosporidium in their annual Consumer Confidence Report. None currently sit at or above the federal limit.
Within the federal limit (19)
Frequently asked
+What is Cryptosporidium?
Cryptosporidium is a contaminant some U.S. public water utilities measure and report in their annual Consumer Confidence Report.
+What is the federal limit for Cryptosporidium in drinking water?
The federal MCLG for Cryptosporidium is 0 . The EPA enforces this against the regulated reporting statistic (typically a running annual average or 90th percentile), not a single-sample spike.
+How many U.S. water systems have Cryptosporidium over the federal limit?
Zero of the 36 public water systems in The Water Map dataset currently report Cryptosporidium at or above its federal limit.
+How can I check if Cryptosporidium 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 Cryptosporidium.