EPA Code 4010 · Maximum Contaminant Level Exceedance
violations
EPA Limit
5 pCi/L
Last Reading
9 PCI/L
First Reported
Jan 2021
Most Recent
Apr 2025
What this violation means
Radium-226 and Radium-228 occur naturally in groundwater, particularly in regions with granite or sandstone aquifers. Long-term ingestion increases the risk of bone, sinus, and other cancers because radium concentrates in bone tissue.
Recommended precautions
- →Reverse osmosis and ion exchange (water softeners) remove radium.
- →Boiling does NOT remove radium and may concentrate it.
- →Private well users in radium-rich geology should test every 3–5 years.