Know Your Environment. Protect Your Health.

Perfluorooctane sulfonate (PFOS)

Williamson County Municipal Utility District 10

NOTE: Williamson County Municipal Utility District 10 purchases water from City of Round Rock which is required to test for perfluorooctane sulfonate (pfos). Sample information shown below was taken by City of Round Rock.

Perfluorooctane sulfonate (PFOS) is a member of a group of perfluorinated chemicals used in many consumer products. PFOS 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
2013ND40ND
2014ND40ND
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019N/A00N/A
2020N/A00N/A
2021N/A00N/A
2022N/A00N/A
2023N/A00N/A
2024ND20ND

ppt = parts per trillion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.3 ppt

The EWG Health Guideline of 0.3 ppt for PFOS was defined by EPA's final toxicity value from the Office of Water’s Final Human Health Toxicity Assessment. This health guideline protects againat cardiovascular harm and harm to fetal growth.

EPA Maximum Contaminant
Level (MCL): 4 ppt

ppt = parts per trillion

All test results

NOTE: Williamson County Municipal Utility District 10 purchases water from City of Round Rock which is required to test for perfluorooctane sulfonate (pfos). Sample information shown below was taken by City of Round Rock.

Date Lab ID Result
2013-08-22Q1305914001ND
2013-08-22Q1305914005ND
2013-08-22Q1305914003ND
2013-11-20Q1313963001ND
2014-02-24Q1405878001ND
2014-02-24Q1405878005ND
2014-02-24Q1405878003ND
2014-05-28Q1417951001ND