PFOS in Drinking Water
Complete contaminant profile for PFOS in drinking water, including sources, environmental pathways, health considerations, testing methods, treatment technologies, and drinking water safety guidance.
Quick Facts
What Is PFOS?
PFOS, or Perfluorooctane Sulfonate, is a synthetic fluorinated chemical belonging to the PFAS family of compounds. It was widely used for decades because of its resistance to heat, water, oil, and chemical degradation.
Today, PFOS is one of the most extensively studied PFAS compounds due to its environmental persistence and widespread occurrence.
Why PFOS Matters
PFOS has gained global attention because it breaks down extremely slowly in the environment and can accumulate in water resources over long periods.
Main Sources of PFOS Contamination
Firefighting Foams
Historical use of aqueous film-forming foams (AFFF) has been a major source of PFOS contamination.
Industrial Manufacturing
Certain manufacturing processes historically used PFOS-containing materials.
Consumer Products
Stain-resistant fabrics, coatings, and specialty products have contributed environmental releases.
Waste Disposal Sites
Landfills and waste management facilities may release PFOS into groundwater and surface water.
Environmental Pathways
PFOS may enter the environment through industrial discharges, firefighting activities, waste disposal, and contaminated runoff.
Because it is highly persistent, PFOS can remain in groundwater, rivers, lakes, and sediments for many years.
Health Considerations
PFOS has been extensively evaluated by environmental and public health agencies around the world.
Ongoing research continues to investigate long-term exposure and potential health impacts associated with PFAS compounds.
How PFOS Is Detected
- PFAS-specific laboratory analysis.
- Groundwater monitoring programs.
- Municipal water testing.
- Environmental investigations.
- Private well assessments.
PFOS Removal Technologies
| Treatment Method | Effectiveness | Comments |
|---|---|---|
| Granular Activated Carbon | High | One of the most widely used PFAS treatment technologies |
| Reverse Osmosis | High | Provides significant PFOS reduction |
| Ion Exchange | High | Frequently used in municipal treatment systems |
| Advanced Treatment Systems | High | Applied in specialized remediation projects |
| Boiling | Not Effective | Does not remove PFOS |
PFOS and Groundwater Contamination
Many PFOS investigations focus on groundwater contamination near airports, military installations, industrial facilities, and firefighting training sites.
Monitoring programs increasingly include PFOS among priority drinking water contaminants.
PFOS and the PFAS Family
PFOS is one member of a much larger group of PFAS chemicals that includes PFOA, PFHxS, GenX chemicals, and numerous other fluorinated compounds.
Because PFOS is among the most studied PFAS chemicals, it often serves as a reference compound in environmental monitoring programs.
Related Contaminants
Frequently Asked Questions
What does PFOS stand for?
PFOS stands for Perfluorooctane Sulfonate.
Why is PFOS called a forever chemical?
Because it degrades very slowly and can persist in the environment for many years.
Can PFOS contaminate drinking water?
Yes. PFOS contamination has been detected in groundwater and drinking water supplies worldwide.
Can boiling remove PFOS?
No. Boiling does not remove PFOS from drinking water.
What treatments are most effective?
Activated carbon, reverse osmosis, and ion exchange are among the most effective PFOS treatment technologies.
Quick Summary
PFOS is one of the most well-known PFAS compounds and is often described as a forever chemical because of its extreme environmental persistence. Associated with firefighting foams, industrial activities, and consumer products, PFOS remains a major focus of drinking water monitoring and remediation efforts worldwide. Activated carbon, reverse osmosis, and ion exchange technologies are among the most effective treatment solutions available.