Perfluorooctane sulfonate (PFOS)
Warminster Municipal Authority
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 22 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | 0.0820 ppt | 130 | 3 | ND - 4.70 ppt |
| 2021 | 13.0 ppt | 40 | 4 | ND - 160.0 ppt |
| 2022 | 39.6 ppt | 142 | 46 | ND - 200.0 ppt |
| 2023 | 25.4 ppt | 85 | 17 | ND - 210.0 ppt |
| 2024 | ND | 1 | 0 | ND |
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 |
|---|---|---|
| 2020-01-08 | 24998700.00 | ND |
| 2020-01-08 | 24998702.00 | ND |
| 2020-01-08 | 24998622.00 | ND |
| 2020-01-08 | 24998624.00 | ND |
| 2020-01-08 | 24998748.00 | ND |
| 2020-01-08 | 24998750.00 | ND |
| 2020-01-22 | 24998706.00 | ND |
| 2020-01-22 | 24998708.00 | ND |
| 2020-01-22 | 24998628.00 | ND |
| 2020-01-22 | 24998630.00 | ND |
| 2020-02-05 | 24998712.00 | ND |
| 2020-02-05 | 24998714.00 | ND |
| 2020-02-05 | 24998634.00 | ND |
| 2020-02-05 | 24998636.00 | ND |
| 2020-02-19 | 24998718.00 | ND |
| 2020-02-19 | 24998720.00 | ND |
| 2020-02-19 | 24998640.00 | ND |
| 2020-02-19 | 24998642.00 | ND |
| 2020-02-19 | 25198934.00 | ND |
| 2020-02-19 | 26098971.00 | ND |
| 2020-03-04 | 24998646.00 | ND |
| 2020-03-04 | 24998648.00 | ND |
| 2020-03-04 | 24998757.00 | ND |
| 2020-03-04 | 24998759.00 | ND |
| 2020-03-18 | 24998652.00 | ND |
| 2020-03-18 | 24998654.00 | ND |
| 2020-03-18 | 24998763.00 | ND |
| 2020-03-18 | 24998765.00 | ND |
| 2020-04-01 | 24998658.00 | ND |
| 2020-04-01 | 24998660.00 | ND |
| 2020-04-01 | 24998769.00 | ND |
| 2020-04-01 | 24998771.00 | ND |
| 2020-04-15 | 24998664.00 | ND |
| 2020-04-15 | 24998666.00 | ND |
| 2020-04-15 | 24998775.00 | ND |
| 2020-04-15 | 24998777.00 | ND |
| 2020-05-06 | 24998670.00 | ND |
| 2020-05-06 | 24998672.00 | ND |
| 2020-05-06 | 24998781.00 | ND |
| 2020-05-06 | 24998783.00 | ND |
| 2020-05-20 | 24998724.00 | ND |
| 2020-05-20 | 24998726.00 | ND |
| 2020-05-20 | 24998676.00 | ND |
| 2020-05-20 | 24998678.00 | ND |
| 2020-05-20 | 24998787.00 | ND |
| 2020-05-20 | 24998789.00 | ND |
| 2020-06-03 | 24998730.00 | ND |
| 2020-06-03 | 24998732.00 | ND |
| 2020-06-03 | 24998682.00 | ND |
| 2020-06-03 | 24998684.00 | ND |
| 2020-06-03 | 24998793.00 | ND |
| 2020-06-03 | 24998795.00 | ND |
| 2020-06-17 | 24998736.00 | ND |
| 2020-06-17 | 24998738.00 | ND |
| 2020-06-17 | 24998688.00 | ND |
| 2020-06-17 | 24998690.00 | ND |
| 2020-06-17 | 24998799.00 | ND |
| 2020-06-17 | 24998801.00 | ND |
| 2020-07-08 | 24998742.00 | ND |
| 2020-07-08 | 24998744.00 | ND |
| 2020-07-08 | 24998694.00 | ND |
| 2020-07-08 | 24998696.00 | ND |
| 2020-07-08 | 24998805.00 | ND |
| 2020-07-08 | 24998807.00 | ND |
| 2020-07-22 | 24620573.00 | ND |
| 2020-07-22 | 24620575.00 | ND |
| 2020-07-22 | 24620507.00 | ND |
| 2020-07-22 | 24620509.00 | ND |
| 2020-07-22 | 24621304.00 | ND |
| 2020-07-22 | 24621306.00 | ND |
| 2020-08-13 | 24620579.00 | ND |
| 2020-08-13 | 24620581.00 | ND |
| 2020-08-13 | 24620513.00 | ND |
| 2020-08-13 | 24620515.00 | ND |
| 2020-08-13 | 24621310.00 | ND |
| 2020-08-13 | 24621312.00 | ND |
| 2020-08-25 | 24620585.00 | ND |
| 2020-08-25 | 24620587.00 | ND |
| 2020-08-25 | 24620519.00 | ND |
| 2020-08-25 | 24620521.00 | ND |
| 2020-08-25 | 24621316.00 | ND |
| 2020-08-25 | 24621318.00 | ND |
| 2020-09-09 | 24620591.00 | ND |
| 2020-09-09 | 24620593.00 | ND |
| 2020-09-09 | 24620525.00 | ND |
| 2020-09-09 | 24620527.00 | ND |
| 2020-09-09 | 24621322.00 | ND |
| 2020-09-09 | 24621324.00 | ND |
| 2020-09-23 | 24620597.00 | ND |
| 2020-09-23 | 24620599.00 | ND |
| 2020-09-23 | 24620531.00 | ND |
| 2020-09-23 | 24620533.00 | ND |
| 2020-09-23 | 24621328.00 | ND |
| 2020-09-23 | 24621330.00 | ND |
| 2020-10-07 | 24620603.00 | ND |
| 2020-10-07 | 24620605.00 | ND |
| 2020-10-07 | 24620537.00 | ND |
| 2020-10-07 | 24620539.00 | ND |
| 2020-10-07 | 24810909.00 | ND |
| 2020-10-07 | 24810911.00 | ND |
| 2020-10-21 | 24620609.00 | ND |
| 2020-10-21 | 24620611.00 | ND |
| 2020-10-21 | 24620543.00 | ND |
| 2020-10-21 | 24620545.00 | ND |
| 2020-10-21 | 24810915.00 | ND |
| 2020-10-21 | 24810917.00 | ND |
| 2020-11-04 | 24620615.00 | ND |
| 2020-11-04 | 24620617.00 | ND |
| 2020-11-04 | 24620549.00 | ND |
| 2020-11-04 | 24620551.00 | ND |
| 2020-11-04 | 24810921.00 | ND |
| 2020-11-04 | 24810923.00 | ND |
| 2020-11-18 | 24620621.00 | ND |
| 2020-11-18 | 24620623.00 | ND |
| 2020-11-18 | 24620555.00 | ND |
| 2020-11-18 | 24620557.00 | ND |
| 2020-11-18 | 24810927.00 | ND |
| 2020-11-18 | 24810929.00 | ND |
| 2020-12-02 | 24620627.00 | 2.30 ppt |
| 2020-12-02 | 24620629.00 | ND |
| 2020-12-02 | 24620561.00 | ND |
| 2020-12-02 | 24620563.00 | ND |
| 2020-12-02 | 24810933.00 | ND |
| 2020-12-02 | 24810935.00 | ND |
| 2020-12-15 | 24620633.00 | 3.60 ppt |
| 2020-12-15 | 24620635.00 | ND |
| 2020-12-15 | 24620567.00 | ND |
| 2020-12-15 | 24620569.00 | ND |
| 2020-12-15 | 24810939.00 | 4.70 ppt |
| 2020-12-15 | 24810941.00 | ND |
| 2021-07-07 | 24810994.00 | ND |
| 2021-07-07 | 24811006.00 | ND |
| 2021-07-07 | 24811030.00 | ND |
| 2021-07-07 | 24811042.00 | ND |
| 2021-07-07 | 24810958.00 | ND |
| 2021-07-07 | 24810970.00 | ND |
| 2021-09-01 | 25202810.00 | ND |
| 2021-09-01 | 25202822.00 | ND |
| 2021-09-01 | 25202774.00 | ND |
| 2021-09-01 | 25202786.00 | ND |
| 2021-09-15 | 25386692.00 | ND |
| 2021-09-15 | 25386740.00 | ND |
| 2021-09-15 | 25386704.00 | ND |
| 2021-09-15 | 25386716.00 | ND |
| 2021-10-12 | 25571157.00 | ND |
| 2021-10-12 | 25571169.00 | ND |
| 2021-10-12 | 25571121.00 | ND |
| 2021-10-12 | 25571133.00 | ND |
| 2021-10-21 | 25387387.00 | ND |
| 2021-10-21 | 25387411.00 | ND |
| 2021-11-03 | 25571193.00 | ND |
| 2021-11-03 | 25571241.00 | ND |
| 2021-11-03 | 25571205.00 | ND |
| 2021-11-03 | 25571217.00 | ND |
| 2021-11-17 | 25571981.00 | ND |
| 2021-11-17 | 25572017.00 | 160.0 ppt |
| 2021-11-17 | 25572029.00 | ND |
| 2021-11-17 | 25571969.00 | 110.0 ppt |
| 2021-11-17 | 25571993.00 | ND |
| 2021-11-17 | 25572005.00 | ND |
| 2021-12-01 | 25747163.00 | ND |
| 2021-12-01 | 25747211.00 | ND |
| 2021-12-01 | 25747175.00 | ND |
| 2021-12-01 | 25747187.00 | ND |
| 2021-12-14 | 25747340.00 | ND |
| 2021-12-14 | 25747376.00 | 150.0 ppt |
| 2021-12-14 | 25747388.00 | ND |
| 2021-12-14 | 25747328.00 | 100.0 ppt |
| 2021-12-14 | 25747352.00 | ND |
| 2021-12-14 | 25747364.00 | ND |
| 2022-01-05 | 25925294.00 | ND |
| 2022-01-05 | 25925330.00 | 150.0 ppt |
| 2022-01-05 | 25925342.00 | ND |
| 2022-01-05 | 25925282.00 | 100.0 ppt |
| 2022-01-05 | 25925306.00 | ND |
| 2022-01-05 | 25925318.00 | ND |
| 2022-01-19 | 25925958.00 | ND |
| 2022-01-19 | 25925994.00 | 160.0 ppt |
| 2022-01-19 | 25926006.00 | ND |
| 2022-01-19 | 25925946.00 | 95.0 ppt |
| 2022-01-19 | 25925970.00 | ND |
| 2022-01-19 | 25925982.00 | ND |
| 2022-02-02 | 26101418.00 | ND |
| 2022-02-02 | 26101454.00 | 170.0 ppt |
| 2022-02-02 | 26101466.00 | ND |
| 2022-02-02 | 26101406.00 | 100.0 ppt |
| 2022-02-02 | 26101430.00 | ND |
| 2022-02-02 | 26101442.00 | ND |
| 2022-02-16 | 26101938.00 | ND |
| 2022-02-16 | 26101974.00 | 190.0 ppt |
| 2022-02-16 | 26101986.00 | ND |
| 2022-02-16 | 26101926.00 | 92.0 ppt |
| 2022-02-16 | 26101950.00 | ND |
| 2022-02-16 | 26101962.00 | ND |
| 2022-03-02 | 26102150.00 | ND |
| 2022-03-02 | 26102186.00 | 190.0 ppt |
| 2022-03-02 | 26102198.00 | ND |
| 2022-03-02 | 26102138.00 | 89.0 ppt |
| 2022-03-02 | 26102162.00 | ND |
| 2022-03-02 | 26102174.00 | ND |
| 2022-03-15 | 26271117.00 | ND |
| 2022-03-15 | 26271153.00 | 180.0 ppt |
| 2022-03-15 | 26271165.00 | ND |
| 2022-03-15 | 26271105.00 | 74.0 ppt |
| 2022-03-15 | 26271129.00 | ND |
| 2022-03-15 | 26271141.00 | ND |
| 2022-04-06 | 26446022.00 | ND |
| 2022-04-06 | 26446058.00 | 180.0 ppt |
| 2022-04-06 | 26446070.00 | ND |
| 2022-04-06 | 26446010.00 | 67.0 ppt |
| 2022-04-06 | 26446034.00 | ND |
| 2022-04-06 | 26446046.00 | ND |
| 2022-04-19 | 26446675.00 | ND |
| 2022-04-19 | 26446711.00 | 200.0 ppt |
| 2022-04-19 | 26446723.00 | ND |
| 2022-04-19 | 26446663.00 | 70.0 ppt |
| 2022-04-19 | 26446687.00 | ND |
| 2022-04-19 | 26446699.00 | ND |
| 2022-05-04 | 26630208.00 | ND |
| 2022-05-04 | 26630244.00 | 160.0 ppt |
| 2022-05-04 | 26630256.00 | ND |
| 2022-05-04 | 26630196.00 | 71.0 ppt |
| 2022-05-04 | 26630220.00 | ND |
| 2022-05-04 | 26630232.00 | ND |
| 2022-05-23 | 26630897.00 | ND |
| 2022-05-23 | 26630933.00 | 180.0 ppt |
| 2022-05-23 | 26630945.00 | ND |
| 2022-05-23 | 26630885.00 | 72.0 ppt |
| 2022-05-23 | 26630909.00 | ND |
| 2022-05-23 | 26630921.00 | ND |
| 2022-06-01 | 26825186.00 | ND |
| 2022-06-01 | 26825234.00 | ND |
| 2022-06-01 | 26825198.00 | ND |
| 2022-06-01 | 26825210.00 | ND |
| 2022-06-14 | 26825258.00 | ND |
| 2022-06-14 | 26825294.00 | 180.0 ppt |
| 2022-06-14 | 26825306.00 | ND |
| 2022-06-14 | 26825246.00 | 75.0 ppt |
| 2022-06-14 | 26825270.00 | ND |
| 2022-06-14 | 26825282.00 | ND |
| 2022-07-08 | 27019752.00 | ND |
| 2022-07-08 | 27019788.00 | 180.0 ppt |
| 2022-07-08 | 27019800.00 | ND |
| 2022-07-08 | 27019740.00 | 77.0 ppt |
| 2022-07-08 | 27019764.00 | ND |
| 2022-07-08 | 27019776.00 | ND |
| 2022-07-25 | 27214895.00 | ND |
| 2022-07-25 | 27214931.00 | 150.0 ppt |
| 2022-07-25 | 27214943.00 | ND |
| 2022-07-25 | 27214883.00 | 93.0 ppt |
| 2022-07-25 | 27214907.00 | ND |
| 2022-07-25 | 27214919.00 | ND |
| 2022-08-03 | 27214967.00 | ND |
| 2022-08-03 | 27215003.00 | 100.0 ppt |
| 2022-08-03 | 27215015.00 | ND |
| 2022-08-03 | 27214955.00 | 85.0 ppt |
| 2022-08-03 | 27214979.00 | ND |
| 2022-08-03 | 27214991.00 | ND |
| 2022-08-17 | 27215677.00 | ND |
| 2022-08-17 | 27215713.00 | 130.0 ppt |
| 2022-08-17 | 27215725.00 | ND |
| 2022-08-17 | 27215665.00 | 99.0 ppt |
| 2022-08-17 | 27215689.00 | ND |
| 2022-08-17 | 27215701.00 | ND |
| 2022-09-07 | 27421582.00 | ND |
| 2022-09-07 | 27421618.00 | 96.0 ppt |
| 2022-09-07 | 27421630.00 | ND |
| 2022-09-07 | 27421570.00 | 110.0 ppt |
| 2022-09-07 | 27421594.00 | ND |
| 2022-09-07 | 27421606.00 | ND |
| 2022-09-21 | 27422332.00 | ND |
| 2022-09-21 | 27422368.00 | 100.0 ppt |
| 2022-09-21 | 27422380.00 | ND |
| 2022-09-21 | 27422320.00 | 120.0 ppt |
| 2022-09-21 | 27422344.00 | ND |
| 2022-09-21 | 27422356.00 | ND |
| 2022-10-05 | 27624781.00 | 96.0 ppt |
| 2022-10-05 | 27624793.00 | ND |
| 2022-10-05 | 27624805.00 | ND |
| 2022-10-05 | 27624745.00 | 100.0 ppt |
| 2022-10-05 | 27624757.00 | ND |
| 2022-10-05 | 27624769.00 | ND |
| 2022-10-19 | 27625350.00 | 130.0 ppt |
| 2022-10-19 | 27625362.00 | ND |
| 2022-10-19 | 27625374.00 | ND |
| 2022-10-19 | 27625314.00 | 100.0 ppt |
| 2022-10-19 | 27625326.00 | ND |
| 2022-10-19 | 27625338.00 | ND |
| 2022-11-02 | 27806470.00 | ND |
| 2022-11-02 | 27806506.00 | 140.0 ppt |
| 2022-11-02 | 27806518.00 | ND |
| 2022-11-02 | 27806458.00 | 88.0 ppt |
| 2022-11-02 | 27806482.00 | ND |
| 2022-11-02 | 27806494.00 | ND |
| 2022-11-16 | 27807163.00 | ND |
| 2022-11-16 | 27807199.00 | 150.0 ppt |
| 2022-11-16 | 27807211.00 | ND |
| 2022-11-16 | 27807151.00 | 110.0 ppt |
| 2022-11-16 | 27807175.00 | ND |
| 2022-11-16 | 27807187.00 | ND |
| 2022-12-07 | 27982267.00 | ND |
| 2022-12-07 | 27982303.00 | 150.0 ppt |
| 2022-12-07 | 27982315.00 | ND |
| 2022-12-07 | 27982255.00 | 97.0 ppt |
| 2022-12-07 | 27982279.00 | ND |
| 2022-12-07 | 27982291.00 | ND |
| 2022-12-21 | 27982339.00 | ND |
| 2022-12-21 | 27982375.00 | 190.0 ppt |
| 2022-12-21 | 27982387.00 | ND |
| 2022-12-21 | 27982327.00 | 94.0 ppt |
| 2022-12-21 | 27982351.00 | ND |
| 2022-12-21 | 27982363.00 | ND |
| 2023-01-04 | 28155440.00 | ND |
| 2023-01-04 | 28155476.00 | 170.0 ppt |
| 2023-01-04 | 28155488.00 | ND |
| 2023-01-04 | 28155428.00 | 78.0 ppt |
| 2023-01-04 | 28155452.00 | ND |
| 2023-01-04 | 28155464.00 | ND |
| 2023-01-18 | 28156008.00 | ND |
| 2023-01-18 | 28156044.00 | 200.0 ppt |
| 2023-01-18 | 28156056.00 | ND |
| 2023-01-18 | 28155996.00 | 86.0 ppt |
| 2023-01-18 | 28156020.00 | ND |
| 2023-01-18 | 28156032.00 | ND |
| 2023-02-01 | 28332868.00 | ND |
| 2023-02-01 | 28332904.00 | 190.0 ppt |
| 2023-02-01 | 28332916.00 | ND |
| 2023-02-01 | 28332856.00 | 73.0 ppt |
| 2023-02-01 | 28332880.00 | ND |
| 2023-02-01 | 28332892.00 | ND |
| 2023-02-14 | 28504146.00 | ND |
| 2023-02-14 | 28504182.00 | 170.0 ppt |
| 2023-02-14 | 28504194.00 | ND |
| 2023-02-14 | 28504134.00 | 82.0 ppt |
| 2023-02-14 | 28504158.00 | ND |
| 2023-02-14 | 28504170.00 | ND |
| 2023-03-01 | 28504847.00 | ND |
| 2023-03-01 | 28504883.00 | 190.0 ppt |
| 2023-03-01 | 28504895.00 | ND |
| 2023-03-01 | 28504835.00 | 80.0 ppt |
| 2023-03-01 | 28504859.00 | ND |
| 2023-03-01 | 28504871.00 | ND |
| 2023-03-15 | 28683102.00 | ND |
| 2023-03-15 | 28683138.00 | 210.0 ppt |
| 2023-03-15 | 28683150.00 | ND |
| 2023-03-15 | 28683090.00 | 79.0 ppt |
| 2023-03-15 | 28683114.00 | ND |
| 2023-03-15 | 28683126.00 | ND |
| 2023-04-04 | 28683174.00 | ND |
| 2023-04-04 | 28683210.00 | ND |
| 2023-04-04 | 28683222.00 | ND |
| 2023-04-04 | 28683162.00 | 74.0 ppt |
| 2023-04-04 | 28683186.00 | ND |
| 2023-04-04 | 28683198.00 | ND |
| 2023-04-19 | 28880672.00 | ND |
| 2023-04-19 | 28880720.00 | ND |
| 2023-04-19 | 28880684.00 | ND |
| 2023-04-19 | 28880696.00 | ND |
| 2023-04-28 | 28880732.00 | 210.0 ppt |
| 2023-05-03 | 28881410.00 | ND |
| 2023-05-03 | 28881446.00 | 190.0 ppt |
| 2023-05-03 | 28881458.00 | ND |
| 2023-05-03 | 28881398.00 | 74.0 ppt |
| 2023-05-03 | 28881422.00 | ND |
| 2023-05-03 | 28881434.00 | ND |
| 2023-05-17 | 29089394.00 | ND |
| 2023-05-17 | 29089418.00 | ND |
| 2023-06-07 | 29090063.00 | ND |
| 2023-06-07 | 29090087.00 | ND |
| 2023-06-21 | 29089931.00 | ND |
| 2023-06-21 | 29089933.00 | ND |
| 2023-07-05 | 29284795.00 | ND |
| 2023-07-05 | 29284798.00 | 1.72 ppt |
| 2023-07-19 | 29284688.00 | ND |
| 2023-07-19 | 29284687.00 | ND |
| 2023-08-02 | 29476887.00 | ND |
| 2023-08-16 | 29476888.00 | ND |
| 2023-08-16 | 29476885.00 | ND |
| 2023-08-23 | 29477576.00 | ND |
| 2023-09-06 | 29682809.00 | ND |
| 2023-09-14 | 29682860.00 | ND |
| 2023-09-20 | 29683392.00 | ND |
| 2023-09-20 | 29683443.00 | ND |
| 2023-10-04 | 29869364.00 | ND |
| 2023-10-04 | 29869413.00 | ND |
| 2023-10-18 | 29869524.00 | ND |
| 2023-10-18 | 29869470.00 | ND |
| 2023-10-31 | 3J05163-01 | ND |
| 2023-11-01 | 30053609.00 | ND |
| 2023-11-01 | 30053555.00 | ND |
| 2023-11-02 | 3J04715-01 | ND |
| 2023-11-15 | 30053717.00 | ND |
| 2023-11-15 | 30053663.00 | ND |
| 2023-12-06 | 30229370.00 | ND |
| 2023-12-06 | 30229316.00 | ND |
| 2023-12-18 | 30229575.00 | ND |
| 2023-12-18 | 30229521.00 | ND |
| 2024-02-07 | 4B00747-01 | ND |