Is my tap water safe to drink in Connecticut?

It depends on your ZIP code and who lives in your home. CheckYourTap analyzes 120+ contaminants in your local water supply and shows which ones exceed health guidelines — not just legal limits. Many contaminants are legal but still pose health risks, especially for babies, pregnant women, elderly, and pets.

What contaminants are in Connecticut tap water?

Connecticut tap water commonly contains disinfection byproducts (haloacetic acids, trihalomethanes), lead from aging pipes, PFAS (forever chemicals), nitrates, arsenic, and radionuclides like radium. The specific contaminants and levels vary by water system — enter your ZIP code to see your local results.

How does CheckYourTap differ from EWG or other water quality databases?

CheckYourTap is the only water quality report personalized for your household composition. Tell us who lives in your home — babies, children, pregnant women, elderly, dogs, or cats — and we calculate adjusted safe levels for each person. A contaminant safe for adults may exceed guidelines for infants by 8x or more.

Is CheckYourTap free?

Yes, CheckYourTap is completely free. Enter your Connecticut ZIP code and household members to get a personalized water quality report with health risk assessments for 120+ contaminants.

Does CheckYourTap cover well water in Connecticut?

Yes. CheckYourTap covers both city water (public water systems) and private well water in Connecticut. Well water reports use USGS groundwater data and include geology-based risk factors for arsenic, uranium, and radon specific to your area.

PFAS

PFDA in Connecticut Drinking Water

PFDA has been detected in water systems serving 6,160 ZIP codes nationwide. Here is what you need to know about pfda in your drinking water and how it may affect your household.

What Is PFDA?

PFDA (perfluorodecanoic acid) is a ten-carbon long-chain PFAS compound found in water supplies due to industrial discharge, firefighting foam residues, and environmental persistence. It enters water through groundwater contamination and wastewater effluent. No EPA maximum contaminant level has been established for PFDA. It is highly bioaccumulative and associated with liver toxicity, immune suppression, thyroid disruption, and developmental effects.

Is PFDA in Your Water?

Enter your Connecticut ZIP code to find out if pfda is in your local water — and see personalized health risks for your household.

Check Your ZIP Code

Health Effects of PFDA

Part of the PFAS (per- and polyfluoroalkyl substances) family of 'forever chemicals.' Linked to cancer, immune system harm, hormone disruption, and developmental effects. Does not break down in the environment or the human body.

Where Does PFDA Come From?

Industrial discharge, firefighting foam (AFFF), consumer products, landfill leachate, wastewater treatment plants.

How to Reduce PFDA in Your Water

1Install a reverse osmosis system certified to NSF/ANSI Standard 58, which is highly effective at removing long-chain PFAS compounds like PFDA.
2Use an activated carbon block filter certified to NSF/ANSI Standard 53 for PFAS reduction; long-chain compounds like PFDA adsorb strongly onto carbon media.
3Anion exchange resins designed for PFAS removal are effective for long-chain carboxylic acids and can provide whole-house treatment.
4Test water using EPA Method 537.1 or 533 to confirm PFDA levels, and verify filtration performance every 6 to 12 months.

Who Is Most Vulnerable to PFDA?

The safe level of pfda varies significantly depending on who is drinking the water. CheckYourTap calculates adjusted safe levels for each member of your household:

Infants (under 1 year)

Toddlers (1-3 years)

Children (4-11 years)

Pregnant women

Elderly (65+)

Adults

Dogs

Cats

A contaminant level that is safe for an adult may exceed guidelines for an infant by 4-8x or more. Check your ZIP code to see personalized results.

Frequently Asked Questions

Is PFDA in my tap water?▾

PFDA has been detected in water systems across 6,160 ZIP codes. Whether it's in your specific water depends on your local water system. Enter your CT ZIP code at CheckYourTap.com for a free, instant report.

What level of PFDA is safe?▾

The safe level depends on who is drinking the water. Health guidelines vary by source, but infants, pregnant women, and pets may need much lower levels. CheckYourTap calculates adjusted safe levels for 11 different household member types.

How do I remove PFDA from my water?▾

Install a reverse osmosis system certified to NSF/ANSI Standard 58, which is highly effective at removing long-chain PFAS compounds like PFDA. Use an activated carbon block filter certified to NSF/ANSI Standard 53 for PFAS reduction; long-chain compounds like PFDA adsorb strongly onto carbon media. For a personalized consultation, contact Valiant Energy Solutions at (475) 557-5107.

Related Contaminants

PFHxS PFOA PFNA PFOS PFHpA

Check Water Quality by ZIP Code

Hartford 06103 New Haven 06510 Bridgeport 06604 Stamford 06901 Waterbury 06702 Norwalk 06850 Danbury 06810 Manchester 06040 View all cities →

View all contaminants in Connecticut water

About This Report

This water quality report is compiled from public records filed with the U.S. Environmental Protection Agency, state health departments, and the U.S. Geological Survey. Contaminant levels are evaluated against EPA federal standards and health-based guidelines from leading environmental and public health organizations. CheckYourTap is a service of Valiant Energy Solutions, a Connecticut water quality and energy services company established in 1930.

EPA SDWISUSGS NWISEWG Tap Water DatabaseCA OEHHA Public Health GoalsWHO Drinking Water Guidelines

Last updated March 2026