Radionuclides
Uranium in U.S. tap water
97 public water systems across 19 U.S. states report Uranium in their annual Consumer Confidence Report. 3 sit at or above the federal limit.
What it is
A naturally occurring radioactive metal from erosion of natural deposits.
Why it's regulated
Long-term exposure above the federal limit can damage the kidneys and increase cancer risk.
At or above the federal limit (3)
| Water system | Measured | vs. limit |
|---|---|---|
| Pomona, CA 2024 annual report | 1.6–2024 pCi/L | 101.2× the limit |
| Glendale, CA 2024 annual report | 2023 pCi/L | 101.2× the limit |
| Albuquerque, NM 2024 annual report | 2 | 2.0× the limit |
Approaching the limit (4)
| Water system | Measured | vs. limit |
|---|---|---|
| Meridian, ID 2024 annual report | 0.029 mg/L | 1.0× the limit |
| Edmond, OK 2024 annual report | 28.8 ug/L | 1.0× the limit |
| Burbank, CA 2024 annual report | 0–19 pCi/L | 0.9× the limit |
| Rialto, CA 2024 annual report | 17 pCi/L | 0.8× the limit |
Within the federal limit (74)
| Water system | Measured |
|---|---|
| Tucson, AZ 2024 annual report | 0–15 ug/L |
| Pasadena, CA 2023 annual report | 8.7 |
| Chula Vista Sweetwater, CA 2024 annual report | 0–8.5 pCi/L |
| Norman, OK 2024 annual report | 12.5 ug/L |
| El Monte, CA 2024 annual report | 2.2–8 pCi/L |
| Los Angeles LADWP, CA 2023 annual report | 7 pCi/L |
| Riverside, CA 2024 annual report | 6.5 |
| City of Hialeah, FL 2023 annual report | 9–9 ug/L |
| City of Homestead, FL 2023 annual report | 9–9 ug/L |
| City of North Miami Beach, FL 2023 annual report | 9–9 ug/L |
| Miami Dade, FL 2023 annual report | 9–9 ug/L |
| Salinas, CA 2024 annual report | 4.9 pCi/L |
| Tempe, AZ 2024 annual report | 0–7 ug/L |
| Simi Valley, CA 2024 annual report | 4.2 pCi/L |
| Oxnard, CA 2024 annual report | 3.67 pCi/L |
| Clovis, CA 2024 annual report | 3.52 pCi/L |
| Chandler, AZ 2024 annual report | 5.2 ug/L |
| Lubbock, TX 2024 annual report | 5.1 ug/L |
| Ventura, CA 2023 annual report | 3.2 pCi/L |
| Huntington Beach, CA 2025 annual report | 3.1 pCi/L |
| Phoenix, AZ 2025 annual report | 0–4.6 ug/L |
| Chula Vista Otay, CA 2024 annual report | 2–3 pCi/L |
| Thousand Oaks, CA 2024 annual report | 2–3 pCi/L |
| Torrance, CA 2024 annual report | 0–3 pCi/L |
| Scottsdale, AZ 2024 annual report | 4.2 ug/L |
| Fullerton, CA 2024 annual report | 2.8 pCi/L |
| Henderson, NV 2024 annual report | 4 ug/L |
| Mobile, AL 2024 annual report | 4 |
| Santa Ana, CA 2024 annual report | 2.6 pCi/L |
| West Covina, CA 2024 annual report | 2.5 pCi/L |
| West Jordan, UT 2024 annual report | 3.7 ug/L |
| West Valley City, UT 2024 annual report | 3.7 ug/L |
| City of Hemet, CA 2024 annual report | 2.4 pCi/L |
| City of Menifee, CA 2024 annual report | 2.4 pCi/L |
| City of Murrieta, CA 2024 annual report | 2.4 pCi/L |
| City of Perris, CA 2024 annual report | 2.4 pCi/L |
| City of San Jacinto, CA 2024 annual report | 2.4 pCi/L |
| City of Temecula, CA 2024 annual report | 2.4 pCi/L |
| East Valley Service Area, CA 2024 annual report | 2.4 pCi/L |
| Mills Service Area, CA 2024 annual report | 2.4 pCi/L |
| Moreno Valley, CA 2024 annual report | 2.4 pCi/L |
| Skinner Service Area, CA 2024 annual report | 2.4 pCi/L |
| Houston, TX 2023 annual report | 3.4 ug/L |
| Stockton, CA 2024 annual report | 2.2 pCi/L |
| Irvine, CA 2023 annual report | 2.1 pCi/L |
| San Diego, CA 2023 annual report | 2.1 pCi/L |
| Avondale, AZ 2024 annual report | 1.7–3.1 ug/L |
| Gilbert, AZ 2024 annual report | 3.1 ug/L |
| Visalia, CA 2024 annual report | 1.8 pCi/L |
| Centennial, CO 2023 annual report | 2.39 ug/L |
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Frequently asked
+What is Uranium?
A naturally occurring radioactive metal from erosion of natural deposits. Long-term exposure above the federal limit can damage the kidneys and increase cancer risk.
+What is the federal limit for Uranium in drinking water?
The federal MCL for Uranium is 0.03 mg/L. 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 Uranium over the federal limit?
3 of the 97 public water systems on The Water Map report Uranium at or above its federal limit, spanning 19 U.S. states. The full list is on this page.
+How can I check if Uranium 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 Uranium.