Know Your Environment. Protect Your Health.

Perfluorotridecanoic acid (PFTrDA)

Northshore Utility District

NOTE: Northshore Utility District purchases water from Seattle Public Utilities which is required to test for perfluorotridecanoic acid (pftrda). Sample information shown below was taken by Seattle Public Utilities.

Perfluorotridecanoic acid (PFTrDA) is a member of a group of perfluorinated chemicals used in many consumer products. PFTrDA 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.

 

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: 0.006 ppt

The EWG Health Guideline of 0.006 ppt for PFTrDA was based on the EPA's recommended application of the toxicity value for PFDA published in the Integrated Risk Information System’s toxicological review. This health guideline protects against harm to the immune system and harm to fetal growth and child development.

ppt = parts per trillion

All test results

NOTE: Northshore Utility District purchases water from Seattle Public Utilities which is required to test for perfluorotridecanoic acid (pftrda). Sample information shown below was taken by Seattle Public Utilities.

Date Lab ID Result
2023-06-274569036ND
2023-06-274569033ND
2023-07-184569037ND
2023-07-184569044ND
2023-09-184569043ND
2023-10-244569038ND
2023-12-184583988ND
2023-12-184583989ND