Is There Gross Beta in Greenwich, CT Water? (ZIP 06832)
By Alexander Snyder, Founder & Water Quality Data LeadLast reviewed July 2026
Yes. Gross Beta has been detected in the public water serving Greenwich, CT (ZIP 06832) in every sample tested — a contaminant with no established safe level, so any detection matters.
In Greenwich (06832), Gross Beta was detected in 100% of 2 samples across 2 water systems, most recently in 2019.
Federal legal limits and stricter health guidelines are not the same — enter your household below for a report on what this means for the specific people in your home.
What is Gross Beta?
Gross beta activity is a screening measurement for beta-emitting radioactive particles in water, including potassium-40, strontium-90, and tritium. It indicates the total beta radiation level rather than a single radionuclide. The EPA maximum contaminant level is 4 millirem per year. Elevated gross beta readings are associated with increased cancer risk, particularly leukemia and bone cancer from long-term exposure.
Who is most at risk in Greenwich?
Gross Beta matters most for infants, pregnancy — a radioactive contaminant with no safe level — developing tissues in infants and during pregnancy are more sensitive to radiation. The safe level for these groups is stricter than for a healthy adult.
How to remove Gross Beta from your water
Install a point-of-use reverse osmosis system certified to NSF/ANSI Standard 58, which removes the majority of dissolved radionuclides that contribute to gross beta activity.
Use an ion exchange system, either cation or anion exchange depending on the specific radionuclide identified, to target the primary contributors to the elevated reading.
Request a detailed radiological analysis from a certified laboratory to identify which specific beta-emitting radionuclides are present before selecting a treatment approach.
Replace filter membranes and dispose of spent media according to your state's radioactive material guidelines, and retest water annually to confirm continued performance.
See what Gross Beta means for your household
Get a free report personalized to the people in your home — infants, pregnancy, children, elderly, and pets.
Check 06832 Water NowHow Greenwich compares
Across Connecticut, Gross Beta is detected in 138 of the communities we track. In Greenwich (06832), it was found in every sample tested.
Gross Beta in nearby Connecticut towns:
Other contaminants of concern in Greenwich (06832)
Frequently Asked Questions
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About this report
Gross Beta detection data for Greenwich, CT (06832) is compiled from public records filed with the U.S. Environmental Protection Agency (EPA SDWIS), the U.S. Geological Survey (USGS NWIS), the Environmental Working Group (EWG) Tap Water Database, and the Connecticut Department of Public Health (CT DPH). Reviewed by CheckYourTap, a service of Valiant Energy Solutions, a Connecticut company established in 1930.
By Alexander Snyder, Founder & Water Quality Data Lead.
This report is general information, not medical advice or a substitute for certified laboratory testing. Talk to your pediatrician or physician about specific health concerns.
Last updated July 2026.
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