Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

4:2 Fluorotelomer Sulfonic Acid (4:2 FTSA)

Merrimack Village District

4:2 Fluorotelomer Sulfonic Acid (4:2 FTSA) is a member of a class of chemicals called per- and polyfluoroalkyl substances or PFAS. These chemicals were used in the production of non-stick, stain repellent and chemically inert coatings. Click here to read more about perfluorinated chemicals.

MORE ABOUT THIS CONTAMINANT

 

47

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019ND470ND

ppt = parts per trillion

State and national drinking water standards and health guidelines

EWG Health Guideline 1 ppt

The EWG Health Guideline of 1 ppt for 4:2 fluorotelomer sulfonic acid (4:2 FTSA) was defined by EWG 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

All test results

Date Lab ID Result
2019-02-279995195ND
2019-02-279995192ND
2019-02-279995194ND
2019-02-279995193ND
2019-03-211015519ND
2019-03-211015516ND
2019-03-211015518ND
2019-03-211015517ND
2019-04-181039203ND
2019-04-181039204ND
2019-04-181039206ND
2019-04-181039205ND
2019-05-231066177ND
2019-05-231066178ND
2019-05-231066180ND
2019-05-231066179ND
2019-06-141081924ND
2019-06-141081922ND
2019-06-141081921ND
2019-06-141081923ND
2019-07-251112056ND
2019-07-251112058ND
2019-07-251112057ND
2019-07-251112055ND
2019-08-291141762ND
2019-08-291141764ND
2019-08-291141763ND
2019-08-291141761ND
2019-09-261163105ND
2019-09-261163107ND
2019-09-261163106ND
2019-09-261163104ND
2019-10-221183118ND
2019-10-221183122ND
2019-10-221183121ND
2019-10-221183120ND
2019-10-221183119ND
2019-11-211210360ND
2019-11-211210359ND
2019-11-211210358ND
2019-11-211210357ND
2019-11-211210356ND
2019-12-191228465ND
2019-12-191228464ND
2019-12-191228463ND
2019-12-191228462ND
2019-12-191228461ND