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Radium 226 228 in U.S. tap water
30 public water systems across 12 U.S. states report Radium 226 228 in their annual Consumer Confidence Report. 2 sit at or above the federal limit.
At or above the federal limit (2)
| Water system | Measured | vs. limit |
|---|---|---|
| City of Baltimore, MD 2024 annual report | 0.2–16 pCi/L | 3.2× the limit |
| Rockford, IL 2024 annual report | 0–6.4 pCi/L | 1.3× the limit |
Approaching the limit (1)
| Water system | Measured | vs. limit |
|---|---|---|
| St Petersburg, FL 2024 annual report | 4 pCi/L | 0.8× the limit |
Within the federal limit (27)
Radium 226 228 by state
Every state where a public water system reports Radium 226 228 in its annual report, ranked by systems at or above the federal limit.
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?
2 of the 30 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.
+Which states report the most Radium 226 228 in their drinking water?
Of the systems on The Water Map, Maryland (1 system at or above the limit), Illinois (1 system at or above the limit) report the most Radium 226 228 exceedances. The state-by-state table on this page lists every state.
+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.