Know Your Environment. Protect Your Health.

Perfluorooctane sulfonate (PFOS)

Oakdale

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.

 

205

Samples

0

Samples exceeding legal limit (MCL)

85

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201595.9 ppt126ND - 439.0 ppt
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019N/A00N/A
2020110.2 ppt4615ND - 770.0 ppt
2021163.6 ppt4524ND - 760.0 ppt
2022114.1 ppt5419ND - 800.0 ppt
2023129.1 ppt4821ND - 900.0 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 Lab ID Result
2015-01-05K1500180-007435.0 ppt
2015-01-05K1500180-011ND
2015-01-05K1500180-009ND
2015-01-05K1500180-00346.7 ppt
2015-01-05K1500180-00187.5 ppt
2015-01-05K1500180-005ND
2015-07-14K1507875-007439.0 ppt
2015-07-14K1507875-011ND
2015-07-14K1507875-009ND
2015-07-14K1507875-00196.1 ppt
2015-07-14K1507875-005ND
2015-07-14K1507875-00345.9 ppt
2020-02-1120B0562-01ND
2020-02-1120B0562-02ND
2020-02-1120B0562-03ND
2020-02-1120B0562-04ND
2020-02-1120B0563-01ND
2020-02-1120B0563-02ND
2020-02-1120B0563-03770.0 ppt
2020-02-1120B0563-04530.0 ppt
2020-05-1920E1147-01ND
2020-05-1920E1147-02ND
2020-05-1920E1147-03ND
2020-05-1920E1147-04ND
2020-05-1920E1152-01ND
2020-05-1920E1152-02ND
2020-05-1920E1152-03660.0 ppt
2020-05-1920E1152-04480.0 ppt
2020-07-1420G0798-01ND
2020-07-1420G0798-02ND
2020-07-1420G0798-03ND
2020-07-1420G0798-04ND
2020-07-1420G0801-0120.0 ppt
2020-07-1420G0801-02ND
2020-08-2420H1889-0128.0 ppt
2020-08-2420H1889-0219.0 ppt
2020-08-2420H1889-03660.0 ppt
2020-08-2420H1889-04520.0 ppt
2020-08-2420H1890-02ND
2020-08-2420H1891-01ND
2020-08-2420H1891-02ND
2020-08-2420H1891-03ND
2020-08-2420H1891-0425.0 ppt
2020-08-2420H1892-02ND
2020-09-1520I0799-01ND
2020-09-1520I0799-02ND
2020-09-1520I0799-03ND
2020-09-1520I0799-0426.0 ppt
2020-09-1520I0801-0144.0 ppt
2020-09-1520I0801-0229.0 ppt
2020-11-1920K0912-01ND
2020-11-1920K0912-02ND
2020-11-1920K0912-03740.0 ppt
2020-11-1920K0912-04520.0 ppt
2020-11-1920K0913-01ND
2020-11-1920K0913-02ND
2020-11-1920K0913-03ND
2020-11-1920K0913-04ND
2021-02-2321B1191-01ND
2021-02-2321B1191-02ND
2021-02-2321B1191-03ND
2021-02-2321B1191-0420.0 ppt
2021-02-2321B1194-01470.0 ppt
2021-02-2321B1194-02340.0 ppt
2021-02-2321B1194-03ND
2021-02-2321B1197-0117.0 ppt
2021-02-2321B1197-02ND
2021-02-2321B1197-03750.0 ppt
2021-02-2321B1197-04570.0 ppt
2021-05-2521E1744-0157.0 ppt
2021-05-2521E1744-0247.0 ppt
2021-05-2521E1744-03670.0 ppt
2021-05-2521E1744-04550.0 ppt
2021-05-2521E1746-01ND
2021-05-2521E1746-0252.0 ppt
2021-05-2521E1746-0343.0 ppt
2021-05-2521E1746-0470.0 ppt
2021-08-1121H0932-01ND
2021-08-1121H0932-02110.0 ppt
2021-08-1121H0932-0386.0 ppt
2021-08-1121H0932-04110.0 ppt
2021-08-1121H0932-05110.0 ppt
2021-08-1121H0932-0699.0 ppt
2021-08-1121H0932-07740.0 ppt
2021-08-1121H0932-08520.0 ppt
2021-08-1121H0932-10ND
2021-08-1121H0932-11350.0 ppt
2021-08-1121H0935-01ND
2021-08-1121H0935-02ND
2021-08-1121H0935-03ND
2021-08-1121H0935-05ND
2021-11-3021K1444-01ND
2021-11-3021K1444-02ND
2021-11-3021K1444-03ND
2021-11-3021K1444-04ND
2021-11-3021K1444-05ND
2021-11-3021K1444-06ND
2021-11-3021K1444-07760.0 ppt
2021-11-3021K1444-08510.0 ppt
2021-11-3021K1444-09310.0 ppt
2021-11-3021K1444-10ND
2021-11-3021K1444-11ND
2021-11-3021K1444-12ND
2022-03-3022C1208-01ND
2022-03-3022C1208-02ND
2022-03-3022C1208-03ND
2022-03-3022C1208-04ND
2022-03-3022C1208-05ND
2022-03-3022C1208-06ND
2022-03-3022C1208-07720.0 ppt
2022-03-3022C1208-08490.0 ppt
2022-05-1722E1291-01ND
2022-05-1722E1291-02ND
2022-05-1722E1291-03ND
2022-05-1722E1291-04ND
2022-05-1722E1291-05ND
2022-05-1722E1291-06ND
2022-05-1722E1291-07670.0 ppt
2022-05-1722E1291-08530.0 ppt
2022-05-1722E1291-09290.0 ppt
2022-05-1722E1291-10ND
2022-05-1722E1291-11ND
2022-05-1722E1291-12ND
2022-08-0422H0440-011.30 ppt
2022-08-0422H0440-02ND
2022-08-0422H0440-032.50 ppt
2022-08-0422H0440-04ND
2022-08-0422H0440-05230.0 ppt
2022-08-0422H0440-06ND
2022-09-1422I0897-01ND
2022-09-1422I0897-0232.0 ppt
2022-09-1422I0897-0335.0 ppt
2022-09-1422I0897-04ND
2022-09-1422I0897-0527.0 ppt
2022-09-1422I0897-06ND
2022-09-1422I0897-07690.0 ppt
2022-09-1422I0897-08530.0 ppt
2022-09-1422I0897-11ND
2022-09-1422I0897-12300.0 ppt
2022-09-1422I0899-01ND
2022-09-1422I0899-02ND
2022-09-1422I0899-03ND
2022-09-1422I0899-05ND
2022-12-2922L1156-011.10 ppt
2022-12-2922L1156-021.50 ppt
2022-12-2922L1159-01ND
2022-12-2922L1159-02ND
2022-12-2922L1159-03ND
2022-12-2922L1159-04ND
2022-12-2922L1159-05ND
2022-12-2922L1159-06ND
2022-12-2922L1159-07800.0 ppt
2022-12-2922L1159-08450.0 ppt
2022-12-2922L1159-09360.0 ppt
2022-12-2922L1159-10ND
2022-12-2922L1159-11ND
2022-12-2922L1159-12ND
2023-03-2323C1149-01ND
2023-03-2323C1149-02ND
2023-03-2323C1149-03ND
2023-03-2323C1149-04ND
2023-03-2323C1149-05ND
2023-03-2323C1149-06ND
2023-03-2323C1149-07750.0 ppt
2023-03-2323C1149-08390.0 ppt
2023-03-2323C1149-09ND
2023-03-2323C1149-10ND
2023-03-2323C1149-11ND
2023-06-0623F0362-01ND
2023-06-0623F0362-02ND
2023-06-0623F0364-0116.0 ppt
2023-06-0623F0364-0218.0 ppt
2023-06-0623F0364-03ND
2023-06-0623F0364-04ND
2023-06-0623F0364-05ND
2023-06-0623F0364-06800.0 ppt
2023-06-0623F0364-07570.0 ppt
2023-06-0623F0364-08360.0 ppt
2023-06-0623F0364-09ND
2023-06-0623F0364-10ND
2023-08-2223H2238-0165.0 ppt
2023-08-2223H2238-0267.0 ppt
2023-08-2223H2238-0329.0 ppt
2023-08-2223H2238-0450.0 ppt
2023-08-2223H2238-05ND
2023-08-2223H2238-06780.0 ppt
2023-08-2223H2238-07610.0 ppt
2023-08-2223H2238-08330.0 ppt
2023-08-2223H2238-09ND
2023-08-2223H2238-1017.0 ppt
2023-08-2223H2241-021.10 ppt
2023-08-2223H2241-030.420 ppt
2023-08-2223H2241-051.20 ppt
2023-08-2223H2241-06ND
2023-12-2823L0917-01ND
2023-12-2823L0917-02ND
2023-12-2823L0919-01ND
2023-12-2823L0919-02ND
2023-12-2823L0919-03ND
2023-12-2823L0919-04ND
2023-12-2823L0919-05ND
2023-12-2823L0919-06900.0 ppt
2023-12-2823L0919-07260.0 ppt
2023-12-2823L0919-08ND
2023-12-2823L0919-09180.0 ppt