Other
Radium 226 228 in U.S. tap water
32 public water systems across 12 U.S. states report Radium 226 228 in their annual Consumer Confidence Report. 1 sit at or above the federal limit.
At or above the federal limit (1)
| Water system | Measured | vs. limit |
|---|---|---|
| Rockford, IL 2024 annual report | 0–6.4 pCi/L | 1.3× the limit |
Within the federal limit (31)
| Water system | Measured |
|---|---|
| St George, UT 2024 annual report | 2.6 pCi/L |
| Sugar Land, TX 2024 annual report | 2.6 pCi/L |
| Madison, WI 2024 annual report | 2.4 pCi/L |
| Ann Arbor, MI 2024 annual report | 2 pCi/L |
| Liberty Utilities - Bellflower-norwalk — Downey, Ca, CA 2023 annual report | 2 pCi/L |
| Foothill Municipal Water Dist. — La Canada Flintridge, Ca, CA 2023 annual report | 0–1 pCi/L |
| Chandler, AZ 2024 annual report | 0–0.9 pCi/L |
| Cleveland, OH 2024 annual report | 0.801 pCi/L |
| City of Newport News, VA 2025 annual report | 0.2–0.6 pCi/L |
| City of Poquoson, VA 2025 annual report | 0.2–0.6 pCi/L |
| Hampton, VA 2025 annual report | 0.2–0.6 pCi/L |
| James City County, VA 2025 annual report | 0.6 pCi/L |
| City of Parlier — Parlier, Ca, CA 2023 annual report | 0–0.55 pCi/L |
| New Bedford, MA 2024 annual report | 0.5 pCi/L |
| Upland, City of — Upland, Ca, CA 2023 annual report | 0–0.254 pCi/L |
| Suburban Water Systems-covina Knolls — Covina, Ca, CA 2023 annual report | 0.2 pCi/L |
| Cal American Wc - Rio Plaza — Rosemead, Ca, CA 2023 annual report | 0.17 pCi/L |
| Adelanto, City of — Adelanto, Ca, CA 2023 annual report | Not detected pCi/L |
| California Domestic Water Company — Whittier, Ca, CA 2021 annual report | Not detected pCi/L |
| California Domestic Water Company — Whittier, Ca, CA 2020 annual report | Not detected pCi/L |
| Covina Irrigating Co. — West Covina, Ca, CA 2020 annual report | Not detected pCi/L |
| Covina Irrigating Co. — West Covina, Ca, CA 2021 annual report | Not detected pCi/L |
| Hesperia, CA 2024 annual report | Not detected pCi/L |
| Las Vegas, NV 2023 annual report | Not detected pCi/L |
| Montebello Land & Water Co. — Montebello, Ca, CA 2023 annual report | Not detected pCi/L |
| Nashville, TN 2023 annual report | Not detected |
| Oildale Mwc — Bakersfield, Ca, CA 2023 annual report | Not detected pCi/L |
| Rubio Canon Land & Water Association — Altadena, Ca, CA 2023 annual report | Not detected pCi/L |
| Rubio Canon Land & Water Association — Altadena, Ca, CA 2020 annual report | Not detected pCi/L |
| South Tahoe Pud - Main — South Lake Tahoe, Ca, CA 2023 annual report | Not detected pCi/L |
| Victorville, CA 2024 annual report | Not detected pCi/L |
Frequently asked
+What is Radium 226 228?
Radium 226 228 is a contaminant some U.S. public water utilities measure and report in their annual Consumer Confidence Report.
+What is the federal limit for Radium 226 228 in drinking water?
The federal MCL for Radium 226 228 is 5 pCi/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 Radium 226 228 over the federal limit?
1 of the 32 public water systems on The Water Map report Radium 226 228 at or above its federal limit, spanning 12 U.S. states. The full list is on this page.
+How can I check if Radium 226 228 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 Radium 226 228.