Know Your Environment. Protect Your Health.

Perfluorooctane sulfonate (PFOS)

Leicester Water Supply District

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.

 

134

Samples

0

Samples exceeding legal limit (MCL)

43

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019N/A00N/A
20202.00 ppt85ND - 8.50 ppt
20211.55 ppt4417ND - 10.00 ppt
20221.25 ppt4614ND - 9.20 ppt
20231.51 ppt367ND - 12.0 ppt

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

Date Result
2020-12-09ND
2020-12-09ND
2020-12-09ND
2020-12-091.40 ppt
2020-12-090.700 ppt
2020-12-098.50 ppt
2020-12-091.40 ppt
2020-12-094.00 ppt
2021-02-22ND
2021-02-220.660 ppt
2021-02-221.40 ppt
2021-02-22ND
2021-02-22ND
2021-02-22ND
2021-02-22ND
2021-02-22ND
2021-02-220.610 ppt
2021-02-223.70 ppt
2021-02-223.00 ppt
2021-02-227.90 ppt
2021-05-132.30 ppt
2021-05-13ND
2021-05-13ND
2021-05-13ND
2021-05-136.20 ppt
2021-05-13ND
2021-05-13ND
2021-06-22ND
2021-06-222.70 ppt
2021-07-202.60 ppt
2021-08-11ND
2021-08-11ND
2021-08-112.70 ppt
2021-08-11ND
2021-08-118.40 ppt
2021-08-11ND
2021-08-11ND
2021-09-15ND
2021-09-153.60 ppt
2021-10-214.00 ppt
2021-10-21ND
2021-10-21ND
2021-10-21ND
2021-10-21ND
2021-10-21ND
2021-10-2110.00 ppt
2021-10-21ND
2021-10-21ND
2021-11-23ND
2021-11-234.20 ppt
2021-12-15ND
2021-12-154.40 ppt
2022-01-25ND
2022-01-25ND
2022-01-25ND
2022-01-258.70 ppt
2022-01-25ND
2022-01-25ND
2022-01-26ND
2022-01-263.50 ppt
2022-01-26ND
2022-02-224.00 ppt
2022-02-22ND
2022-03-16ND
2022-03-163.40 ppt
2022-04-28ND
2022-04-28ND
2022-04-28ND
2022-04-28ND
2022-04-28ND
2022-04-28ND
2022-04-28ND
2022-04-286.60 ppt
2022-04-282.40 ppt
2022-05-19ND
2022-05-19ND
2022-06-283.00 ppt
2022-06-28ND
2022-07-20ND
2022-07-20ND
2022-07-20ND
2022-07-20ND
2022-07-209.20 ppt
2022-07-20ND
2022-07-203.90 ppt
2022-07-200.990 ppt
2022-08-25ND
2022-08-25ND
2022-09-22ND
2022-09-223.80 ppt
2022-10-260.980 ppt
2022-10-26ND
2022-10-26ND
2022-10-26ND
2022-11-221.20 ppt
2022-11-22ND
2022-12-205.60 ppt
2022-12-20ND
2023-01-270.790 ppt
2023-01-27ND
2023-01-275.10 ppt
2023-01-27ND
2023-01-274.90 ppt
2023-01-27ND
2023-01-27ND
2023-01-27ND
2023-01-278.50 ppt
2023-01-27ND
2023-02-21ND
2023-03-22ND
2023-04-2512.0 ppt
2023-04-25ND
2023-04-25ND
2023-04-25ND
2023-04-25ND
2023-04-25ND
2023-05-22ND
2023-06-22ND
2023-07-24ND
2023-07-24ND
2023-07-2411.0 ppt
2023-07-24ND
2023-07-24ND
2023-07-24ND
2023-08-22ND
2023-08-23ND
2023-09-28ND
2023-09-29ND
2023-10-17ND
2023-10-17ND
2023-10-17ND
2023-10-17ND
2023-10-17ND
2023-10-1712.0 ppt