Is There Lead in Darien, CT Water? (ZIP 06820)
By Alexander Snyder, Founder & Water Quality Data LeadLast reviewed July 2026
Yes. Lead has been detected in the public water serving Darien, CT (ZIP 06820) in 91% of samples — above the EPA limit in 7% of samples.
In Darien (06820), Lead was detected in 91% of 182 samples across 5 water systems, most recently in 2026.
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 Lead?
Lead is a toxic heavy metal that leaches into drinking water from corroded pipes, solder, and plumbing fixtures, particularly in homes built before 1986. The EPA action level is 15 parts per billion, but no amount of lead in water is considered safe. Chronic exposure causes developmental delays in children and kidney damage in adults.
Who is most at risk in Darien?
Lead matters most for infants, young children, pregnancy — harms developing brains — there is no safe level for children, and it crosses the placenta. The safe level for these groups is stricter than for a healthy adult.
How to remove Lead from your water
Install a point-of-use filter certified to NSF/ANSI Standard 53 for lead reduction, such as a reverse osmosis system or activated carbon block filter.
Run cold water for 30 seconds to 2 minutes before drinking or cooking, especially after water has sat in pipes for several hours, to flush lead-laden water from the service line.
Replace lead service lines and any brass fixtures or lead solder connections in your home plumbing, and test your water annually through a state-certified laboratory.
Never use hot tap water for drinking, cooking, or preparing baby formula, as hot water dissolves lead from plumbing more readily than cold water.
See what Lead means for your household
Get a free report personalized to the people in your home — infants, pregnancy, children, elderly, and pets.
Check 06820 Water NowHow Darien compares
Across Connecticut, Lead is detected in 266 of the communities we track, and is above a limit or standard in 198. In Darien (06820), it was found in 91% of samples, above the EPA limit in 7% of samples.
Lead in nearby Connecticut towns:
Other contaminants of concern in Darien (06820)
Frequently Asked Questions
Is there Lead in Darien 06820 tap water?▾
What level of Lead is safe?▾
Do I need a water filter for Lead in Darien?▾
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About this report
Lead detection data for Darien, CT (06820) 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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