Know Your Environment. Protect Your Health.

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

Alderwood Water District

NOTE: Alderwood Water District purchases water from City of Everett Public Works Department which is required to test for 4:2 fluorotelomer sulfonic acid (4:2 ftsa). Sample information shown below was taken by City of Everett Public Works Department.

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.

 

8

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019N/A00N/A
2020N/A00N/A
2021N/A00N/A
2022N/A00N/A
2023ND40ND

ppt = parts per trillion

State, National, and Health Guidelines for Drinking Water

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.

ppt = parts per trillion

All test results

NOTE: Alderwood Water District purchases water from City of Everett Public Works Department which is required to test for 4:2 fluorotelomer sulfonic acid (4:2 ftsa). Sample information shown below was taken by City of Everett Public Works Department.

Date Lab ID Result
2023-02-23380-38760-2ND
2023-02-23380-38760-1ND
2023-05-16380-48014-3ND
2023-05-16380-48014-1ND
2023-08-15380-59537-1ND
2023-08-15380-59537-2ND
2023-11-07380-70382-1ND
2023-11-07380-70382-3ND