Perfluorobutanoic Acid (PFBA) in Drinking Water
Found in 3,425 water systems • Detected
Updated September 2026 • Data from EWG & EPA
What is Perfluorobutanoic Acid (PFBA) and Why Does It Matter?
PERFLUOROBUTANOIC ACID (PFBA): WHAT YOU NEED TO KNOW
What Is PFBA and Where Does It Come From?
Perfluorobutanoic acid (PFBA) belongs to a group of chemicals called "forever chemicals" — a nickname earned because they don't break down in the environment or in your body. PFBA is a short-chain fluorinated compound used in industrial processes, particularly in manufacturing non-stick coatings, water-resistant textiles, and aqueous film-forming foams (AFFF) used at airports and military bases for firefighting. When these products reach the end of their life, or when AFFF is deployed, PFBA leaches into groundwater and surface water. Because it's highly soluble and mobile, it travels easily through soil and can contaminate drinking water supplies far from the original source.
Our analysis detected PFBA in 3,425 water systems across the United States, with an average concentration of 5.7 parts per trillion (ppt). One system exceeded current health guidelines, reaching 1,067.3 ppt — nearly 200 times the average. Texas leads in detection frequency with 635 systems, followed by New York (518), Minnesota (397), North Carolina (238), and California (196). This geographic pattern reflects both industrial activity and the presence of military installations and airports in these regions.
Health Effects and Exposure Risks
PFBA exposure is a legitimate concern, even at low levels, because these chemicals accumulate in your body over time. The Environmental Working Group (EWG) established a health guideline of 5.1 ppt for PFBA based on animal studies showing effects on the liver, immune system, and thyroid function. Human studies remain limited, but research suggests PFBA may interfere with hormone regulation and reduce vaccine effectiveness in children — effects observed in lab animals at relatively modest exposure levels.
The EPA has not set a federal drinking water standard for PFBA, treating it instead as an unregulated contaminant. This regulatory gap means many water systems aren't required to test for it, and consumers have no legal protection. The EWG guideline of 5.1 ppt is significantly stricter than what EPA considers "safe" under current rules, reflecting the precautionary approach many scientists recommend for chemicals that persist in the body and environment.
The Regulatory Landscape
As of now, PFBA exists in a regulatory gray zone. The EPA monitors it but hasn't established a maximum contaminant level (MCL) — the legally enforceable limit for public water systems. This doesn't mean PFBA is safe; it means the EPA hasn't yet finalized rules requiring treatment. The EWG's 5.1 ppt guideline, based on health research, is much stricter and represents what many water quality experts consider protective for families. Given that one system in our analysis exceeded 1,000 ppt, the gap between current regulations and actual contamination is concerning.
Geographic Patterns and Why They Matter
The concentration of PFBA in Texas, New York, and Minnesota reflects industrial manufacturing hubs and military presence. Texas has significant aerospace and chemical manufacturing, plus military bases using AFFF. Minnesota's detection rate correlates with industrial processing and aqueous film-forming foam use at airports. If you live in these states, especially near military installations, airports, or chemical manufacturing facilities, your risk is higher.
How to Protect Your Family
The most effective removal method for PFBA is reverse osmosis (RO), which removes up to 99% of fluorinated chemicals including PFBA. Granular activated carbon (GAC) filters offer moderate protection but are less reliable for short-chain PFBA compared to longer-chain PFOA and PFOS. If your water system detected PFBA or you live in a high-detection area, an Echo Water reverse osmosis system provides comprehensive protection. Combining RO with regular testing ensures you're removing PFBA and other forever chemicals from your drinking and cooking water.
Request a water test to know your specific exposure level — knowledge is your first defense.
Regulatory Standards for Perfluorobutanoic Acid (PFBA)
| Standard | Level | Notes |
|---|---|---|
| EWG Health Guideline | 1,000 ppt | Stricter, based on latest science |
| Average Detected Level | 5.70 ppt | Across all tested systems |
| Highest Detected Level | 1,067.30 ppt | Worst-case system |
Cities With the Highest Perfluorobutanoic Acid (PFBA) Levels
| # | City | Detected Level | People Served |
|---|---|---|---|
| 1 | Oakdale, MN | 1,067.30 ppt | 28,303 |
| 2 | St. Paul Park, MN | 788.20 ppt | 5,427 |
| 3 | Cottage Grove, MN | 672.50 ppt | 39,712 |
| 4 | Hastings, MN | 640 ppt | 140 |
| 5 | Newport, MN | 313.90 ppt | 4,000 |
| 6 | Woodbury, MN | 264.80 ppt | 82,643 |
| 7 | Hastings, MN | 253.60 ppt | 23,222 |
| 8 | Prescott, WI | 241.20 ppt | 0 |
| 9 | Oakdale, MN | 198.30 ppt | 80 |
| 10 | Little Canada, MN | 193.30 ppt | 266 |
| 11 | Davenport, IA | 161.80 ppt | 24,769 |
| 12 | Lincoln, IL | 127.40 ppt | 1,036 |
| 13 | Peoria, IL | 127.40 ppt | 15,200 |
| 14 | Lake Elmo, MN | 125.70 ppt | 2,400 |
| 15 | Canton, MO | 125 ppt | 0 |
States Most Affected by Perfluorobutanoic Acid (PFBA)
How to Remove Perfluorobutanoic Acid (PFBA) From Your Water
Reverse osmosis (RO) systems are generally the most effective at removing a wide range of contaminants from drinking water.
Standard pitcher filters and carbon-only filters do not reliably remove Perfluorobutanoic Acid (PFBA). A reverse osmosis system with NSF/ANSI 58 certification is the most reliable solution.
Echo RO System
Removes Perfluorobutanoic Acid (PFBA) and 99.9% of other contaminants. The gold standard for drinking water purification.
View RO SystemsEcho Hydrogen Water Flask
Once your water is clean, supercharge it with molecular hydrogen for antioxidant benefits.
Shop Hydrogen FlaskFrequently Asked Questions
Is Perfluorobutanoic Acid (PFBA) in my drinking water?
Perfluorobutanoic Acid (PFBA) was detected in 3425 water systems across the US. Check your city's water quality report to see if it affects your water supply.
What are the health effects of Perfluorobutanoic Acid (PFBA) in water?
Perfluorobutanoic Acid (PFBA) has been associated with various health concerns at elevated levels. The EWG has set health guidelines that are typically stricter than EPA legal limits.
Which city has the most Perfluorobutanoic Acid (PFBA) in its water?
Based on our analysis, Oakdale, MN has the highest detected levels of Perfluorobutanoic Acid (PFBA) in its water supply.
How do I remove Perfluorobutanoic Acid (PFBA) from my water?
Reverse osmosis (RO) systems are generally the most effective at removing this contaminant. Check the filtration recommendations section for specific guidance.
Related Contaminant Guides
Data sources: Environmental Working Group (EWG) Tap Water Database, U.S. EPA Safe Drinking Water Information System (SDWIS)
Last updated: September 2026
Methodology: Contaminant levels are compared against both EPA legal limits (Maximum Contaminant Levels) and EWG health guidelines, which are often stricter and based on the latest scientific research.
