EPA legal limit
No federal limit
Maximum Contaminant Level
EWG health guideline
0.5 ppt
Science-based, stricter target
Health effects
PFTrDA has exceptional persistence in the body due to its thirteen-carbon chain. Animal studies show effects on liver, immune system, and reproduction. Its bioaccumulation profile is expected to be more pronounced than PFOA or PFDA. Very limited human exposure data exists at drinking water concentrations.
Where it comes from
Industrial use as a surfactant and processing aid in fluoropolymer manufacturing. Found in industrial wastewater and contaminated groundwater near PFAS manufacturing facilities. Rare in drinking water but detected in UCMR5 monitoring.
How it's regulated
No federal EPA MCL. Not individually regulated under the 2024 PFAS NPDWR. Monitored under UCMR5. EWG health guideline: 0.5 ppt, based on bioaccumulation potential analogous to other ultra-long-chain PFAS.
How to filter pftrda
Not all filters address pftrda. Look for independently certified filters—NSF International certification means the removal claim has been independently verified.
Frequently asked questions
What is pftrda?
PFTrDA is a thirteen-carbon long-chain carboxylic acid PFAS. It is among the longest-chain PFAS monitored under UCMR5 and is of elevated concern due to its extreme bioaccumulation potential. Detected at lower frequency than shorter-chain PFAS but present in multiple states.
What are the health effects of pftrda?
PFTrDA has exceptional persistence in the body due to its thirteen-carbon chain. Animal studies show effects on liver, immune system, and reproduction. Its bioaccumulation profile is expected to be more pronounced than PFOA or PFDA. Very limited human exposure data exists at drinking water concentrations.
Is pftrda regulated in drinking water?
No federal EPA MCL. Not individually regulated under the 2024 PFAS NPDWR. Monitored under UCMR5. EWG health guideline: 0.5 ppt, based on bioaccumulation potential analogous to other ultra-long-chain PFAS.
Where does pftrda come from?
Industrial use as a surfactant and processing aid in fluoropolymer manufacturing. Found in industrial wastewater and contaminated groundwater near PFAS manufacturing facilities. Rare in drinking water but detected in UCMR5 monitoring.
How do I remove pftrda from tap water?
The most effective methods for removing pftrda are: Reverse osmosis (RO), NSF 58 certified RO system. Look for NSF-certified systems—independent certification confirms removal claims have been verified.
Is pftrda in your water?
Enter your ZIP code to see the measured level in your specific utility.