Radiological
Gross alpha activity
What it is
A screening measurement of total alpha radiation in water, mostly from natural uranium, radium, and related elements in rock.
Your body
According to EPA, long-term exposure above the federal limit has been linked to an increased risk of cancer.
Your home
Alpha emitters do not affect plumbing.
Federal standard: MCL 15 pCi/L (EPA)
Treatment options that can reduce it
Research & sources (2)
Maryland water systems that reported gross alpha activity
- City of FrederickFrederick · 2025 data
- Harford County Department of Public WorksHarford · 2025 data
- WSSC WaterMontgomery and Prince George's · 2025 data
The information on this site is for general education only and is not medical advice. Talk with a qualified health professional about health concerns. Water treatment equipment performance depends on the system, its certification, and proper maintenance.
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