Microbial
Cryptosporidium in U.S. tap water
19 public water systems across 9 U.S. states report Cryptosporidium in their annual Consumer Confidence Report. None currently sit at or above the federal limit.
Within the federal limit (11)
| Water system | Measured |
|---|---|
| Albuquerque, NM 2024 annual report | 0.004 |
| Charleston, SC 2024 annual report | 0 |
| Columbus, OH 2025 annual report | Not detected |
| Frisco, TX 2024 annual report | 0–0 |
| Grand Rapids, MI 2025 annual report | Not detected |
| North Charleston, SC 2024 annual report | 0 |
| Plano, TX 2024 annual report | 0–0 |
| Pomona, CA 2024 annual report | Not detected |
| Richardson, TX 2024 annual report | 0 |
| West Jordan, UT 2024 annual report | Not detected |
| Wichita Falls, TX 2024 annual report | 0 |
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 MCL for Cryptosporidium is 1 . 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 19 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.