Know Your Environment. Protect Your Health.

11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)

Littleton Water Department

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.

 

136

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
2020ND110ND
2021ND360ND
20220.0130 ppt511ND - 0.666 ppt
2023ND370ND
2024ND10ND

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 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.

ppt = parts per trillion

All test results

Date Result
2020-10-15ND
2020-10-15ND
2020-10-15ND
2020-10-15ND
2020-10-15ND
2020-10-15ND
2020-10-15ND
2020-10-15ND
2020-11-04ND
2020-11-04ND
2020-11-04ND
2021-01-12ND
2021-01-12ND
2021-01-12ND
2021-02-08ND
2021-02-08ND
2021-02-08ND
2021-03-17ND
2021-03-17ND
2021-03-17ND
2021-04-05ND
2021-04-05ND
2021-04-05ND
2021-05-12ND
2021-05-12ND
2021-05-12ND
2021-06-08ND
2021-06-08ND
2021-06-08ND
2021-07-21ND
2021-07-21ND
2021-07-21ND
2021-09-08ND
2021-09-08ND
2021-09-08ND
2021-10-06ND
2021-10-06ND
2021-10-06ND
2021-10-13ND
2021-10-21ND
2021-10-28ND
2021-11-15ND
2021-11-15ND
2021-11-15ND
2021-12-14ND
2021-12-14ND
2021-12-14ND
2022-01-110.666 ppt
2022-01-11ND
2022-01-11ND
2022-01-18ND
2022-02-16ND
2022-02-16ND
2022-02-16ND
2022-03-16ND
2022-03-16ND
2022-03-16ND
2022-04-20ND
2022-04-20ND
2022-04-25ND
2022-04-27ND
2022-05-16ND
2022-05-16ND
2022-05-18ND
2022-05-18ND
2022-05-18ND
2022-06-22ND
2022-06-22ND
2022-06-22ND
2022-06-22ND
2022-07-13ND
2022-07-13ND
2022-07-13ND
2022-07-13ND
2022-07-13ND
2022-07-13ND
2022-08-03ND
2022-08-03ND
2022-08-03ND
2022-08-03ND
2022-09-26ND
2022-09-26ND
2022-09-27ND
2022-09-27ND
2022-10-19ND
2022-10-19ND
2022-10-19ND
2022-10-27ND
2022-10-27ND
2022-10-27ND
2022-11-07ND
2022-11-07ND
2022-11-09ND
2022-11-09ND
2022-12-20ND
2022-12-20ND
2022-12-20ND
2022-12-20ND
2023-01-03ND
2023-01-03ND
2023-01-24ND
2023-01-24ND
2023-01-24ND
2023-01-24ND
2023-02-01ND
2023-02-01ND
2023-03-07ND
2023-03-07ND
2023-04-18ND
2023-04-18ND
2023-04-18ND
2023-04-18ND
2023-05-17ND
2023-05-17ND
2023-05-17ND
2023-06-16ND
2023-06-16ND
2023-07-25ND
2023-07-25ND
2023-07-25ND
2023-07-25ND
2023-07-25ND
2023-07-25ND
2023-08-21ND
2023-08-21ND
2023-09-19ND
2023-09-19ND
2023-10-03ND
2023-10-03ND
2023-10-03ND
2023-10-12ND
2023-11-28ND
2023-11-28ND
2023-11-28ND
2023-12-19ND
2024-07-17ND