Historical PFSA Results

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In 2016, USEPA issued drinking water health advisories for PFOA and PFOS at 70 parts per trillion (ppt). These standards are non binding, non regulatory, and meant to provide technical information to state agencies and other public health officials on health effects, analytical methodologies, and treatment technologies associated with drinking water contamination. Evanston's results are well below the Health Advisory of 70 ppt. Communities along the west shore of Lake Michigan are seeing similar results at about 2 ppt on average. 

 

   2019  2019
ANALYTE (ppt)   TAP  RAW
 Perfluorooctane sulfonate (PFOS)  2.1  2.1
 Perfluorooctanoic acid (PFOA)  <2.0  <2.0
 11Cl-PF3OUdS/F-53B Minor  <2.0  <2.0
 9Cl-PF3ONS/F-53B Major  <2.0  <2.0
 ADONA  <2.0  <2.0
 HFPO-DA/GenX  <2.0  <2.0
 N-ethyl Perfluorooctanesulfonamidoacetic acid  <2.0  <2.0
 N-Menthyl Perfluorooctanesulfonamidoacetic acid  <2.0  <2.0
 Perfluorobutanesulfonic acid (PFBS)  <2.0  <2.0
 Perfluorodecanoic acid (PFDA)  <2.0  <2.0
 Perfluorododecanoic acid (PFDoA)  <2.0  <2.0
 Perfluoroheptanoic acid (PFHpA)  <2.0  <2.0
 Perfluorohexanesulfonic acid (PFHxS)  <2.0  <2.0
 Perfluorohexanoic acid (PFHxA)  <2.0  <2.0
 Perfluorononanoic acid (PFNA)  <2.0  <2.0
 Perfluorotetradecanoic acid (PFTeDA)  <2.0  <2.0
 Perfluorotridecanoic acid (PFTrDA)  <2.0  <2.0
 Perfluoroundecanoic acid (PFUnA)  <2.0  <2.0

 

   2018
 ANALYTE (ppt)  TAP
 Perfluorooctane sulfonate (PFOS)  2.1
 Perfluorooctanoic acid (PFOA)  <2.0

 

   8/15/2013  11/14/2013  2/12/2014  5/7/2014
 ANALYTE (ppb)  TAP  TAP  TAP  TAP
 Perfluorooctane (PFOS)  <0.04  <0.04  <0.04  <0.04
 Perfluorooctanoic acid (PFOA)  <0.02  <0.02  <0.02  <0.02

 

   2009  2010  2011
 ANALYTE (ppt)  TAP  TAP  TAP
 Perfluorooctane sulfonate (PFOS)  2.1  1.5  1.8
 Perfluorooctanoic acid (PFOA)  <10  <10  <10

 

ppt = parts per trillion             ppb = parts per billion