PFUnA in Connecticut Drinking Water
By Alexander Snyder, Founder & Water Quality Data Lead
PFUnA has been tracked across Connecticut drinking water. Here is what you need to know about pfuna in your drinking water and how it may affect your household.
What Is PFUnA?
PFUnA (perfluoroundecanoic acid) is an eleven-carbon long-chain PFAS compound found in water supplies due to industrial discharge, degradation of fluorotelomer-based products, and environmental persistence. No EPA maximum contaminant level has been set. It is one of the more bioaccumulative PFAS compounds and is associated with liver damage, immune system effects, and potential reproductive and developmental harm.
Is PFUnA in Your Water?
Enter your Connecticut ZIP code to find out if pfuna is in your local water — and see personalized health risks for your household.
Check Your ZIP CodeHealth Effects of PFUnA
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 PFUnA Come From?
Industrial discharge, firefighting foam (AFFF), consumer products, landfill leachate, wastewater treatment plants.
How to Reduce PFUnA in Your Water
- 1Install a reverse osmosis system certified to NSF/ANSI Standard 58, which is highly effective at removing long-chain PFAS compounds including PFUnA.
- 2Use an activated carbon block filter certified to NSF/ANSI Standard 53; long-chain PFAS like PFUnA have strong affinity for carbon and are efficiently adsorbed.
- 3Anion exchange resins designed for PFAS removal are effective for long-chain carboxylic acids and can serve as whole-house treatment.
- 4Test water using EPA Method 537.1 to confirm PFUnA concentrations and verify filter performance on a regular schedule.
Who Is Most Vulnerable to PFUnA?
The safe level of pfuna varies significantly depending on who is drinking the water. CheckYourTap calculates adjusted safe levels for each member of your household:
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.
Reading this inside ChatGPT or Claude?
This page can tell you the general science, but not what is actually in your water’s pfuna level — that depends on your exact address. You can get your specific answer two ways:
- Inside the chat: ask your assistant to “check my tap water with CheckYourTap”. Our connector returns your ZIP code’s measured contaminant levels — including the derived dog and cat safe levels — and, only if you ask it to, can email you the report or arrange a specialist callback.
- On the web: open CheckYourTap.com and enter your ZIP code for a free 30-second report.
Concerned about PFUnA in your water?
Schedule to get your water tested for pfuna and more — a Valiant water specialist will review your results and arrange testing for your home.
Frequently Asked Questions
Is PFUnA in my tap water?▾
What level of PFUnA is safe?▾
How do I remove PFUnA from my water?▾
Related Contaminants
Check Water Quality by ZIP Code
Sources
The legal limits and health guidelines for PFUnA on this page come from the following public authorities:
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.
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.
Reviewed by the CheckYourTap editorial team. Last updated July 2026