11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
Status: No national drinking water standard exists
11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) is a member of a group of perfluorinated chemicals used in many consumer products. 11Cl-PF3OUdS and other perfluorinated chemicals can cause serious health effects, including cancer, endocrine disruption, accelerated puberty, liver and immune system damage, and thyroid changes. These chemicals are persistent in the environment and they accumulate in people. Click here to read more about perfluorinated chemicals.
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states detected
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utilities detected
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people served
State and national drinking water standards and health guidelines
EWG Health Guideline 1 ppt
The EWG Health Guideline of 1 ppt for 11Cl-PF3OUdS was defined by EWG as based on studies by Phillipe Grandjean of Harvard University and many other independent researchers who found reduced effectiveness of vaccines and adverse impacts on mammary gland development from exposure to PFOA and PFOS, the two PFAS most widely detected in drinking water. This health guideline protects against applies to the entire class of PFAS detected in water.
ppt = parts per trillion
States reporting 11Cl-PF3OUdS in drinking water
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| State | Utilities | People Served |
Filtering technologies that reduce 11Cl-PF3OUdS
Activated Carbon
Reverse Osmosis
Utilities with the highest amounts of 11Cl-PF3OUdS, 2017-2019
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| Utility | Location | Tests | Average level | People served |
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