Data by Location
PFAS Contamination by State
Data from EPA UCMR 5 — the most comprehensive PFAS testing of US public water systems. Click any state to see detailed results by city and water utility.
3,480
Systems Tested Nationwide
1,681
Above EPA Limits
48
States with Violations
How to read this data: States are ranked by the number of water systems exceeding EPA Maximum Contaminant Levels (MCLs).
The red progress bar in each card shows the percentage of systems above limits.
Click any state to find your specific water utility by city or ZIP code.
California
CA
Systems tested 234
With detections 234
Above EPA limits 164 (70%)
% above MCL 70%
Most detected:
PFHxSPFOSPFPeAPFHxA
Florida
FL
Systems tested 191
With detections 191
Above EPA limits 157 (82%)
% above MCL 82%
Most detected:
PFOSPFBSPFPeAPFHxA
New Jersey
NJ
Systems tested 174
With detections 174
Above EPA limits 156 (90%)
% above MCL 90%
Most detected:
PFOAPFPeAPFHxAPFOS
Pennsylvania
PA
Systems tested 174
With detections 174
Above EPA limits 119 (68%)
% above MCL 68%
Most detected:
PFPeAPFBSPFHxAPFOA
North Carolina
NC
Systems tested 145
With detections 145
Above EPA limits 115 (79%)
% above MCL 79%
Most detected:
PFOSPFPeAPFHxAPFOA
Massachusetts
MA
Systems tested 143
With detections 143
Above EPA limits 106 (74%)
% above MCL 74%
Most detected:
PFPeAPFHxAPFOAPFBS
Texas
TX
Systems tested 611
With detections 611
Above EPA limits 103 (17%)
% above MCL 17%
Most detected:
PFBAPFPeAPFHxAPFBS
Alabama
AL
Systems tested 117
With detections 117
Above EPA limits 79 (68%)
% above MCL 68%
Most detected:
PFBSPFBAPFOSPFHxA
South Carolina
SC
Systems tested 90
With detections 90
Above EPA limits 68 (76%)
% above MCL 76%
Most detected:
PFPeAPFHxAPFBSPFOS
Ohio
OH
Systems tested 141
With detections 141
Above EPA limits 59 (42%)
% above MCL 42%
Most detected:
PFBAPFPeAPFBSPFHxA
New York
NY
Systems tested 98
With detections 98
Above EPA limits 52 (53%)
% above MCL 53%
Most detected:
PFPeAPFOAPFHxAPFBA
Georgia
GA
Systems tested 77
With detections 77
Above EPA limits 42 (55%)
% above MCL 55%
Most detected:
PFBSPFPeAPFHxAPFOS
Tennessee
TN
Systems tested 87
With detections 87
Above EPA limits 37 (43%)
% above MCL 43%
Most detected:
PFBSPFBAPFHxAPFOS
Connecticut
CT
Systems tested 40
With detections 40
Above EPA limits 35 (88%)
% above MCL 88%
Most detected:
PFOAPFOSPFPeAPFBS
Washington
WA
Systems tested 66
With detections 66
Above EPA limits 34 (52%)
% above MCL 52%
Most detected:
PFBSPFPeAPFHxAPFOS
Kentucky
KY
Systems tested 87
With detections 87
Above EPA limits 32 (37%)
% above MCL 37%
Most detected:
PFPeAPFBAPFHxAPFOA
Illinois
IL
Systems tested 123
With detections 123
Above EPA limits 27 (22%)
% above MCL 22%
Most detected:
PFBAPFPeAPFHxAPFBS
Arizona
AZ
Systems tested 57
With detections 57
Above EPA limits 25 (44%)
% above MCL 44%
Most detected:
PFBSPFPeAPFHxAPFHxS
Wisconsin
WI
Systems tested 51
With detections 51
Above EPA limits 23 (45%)
% above MCL 45%
Most detected:
PFHxSPFBSPFBAPFPeA
West Virginia
WV
Systems tested 34
With detections 34
Above EPA limits 21 (62%)
% above MCL 62%
Most detected:
PFOAPFBSPFHxAPFPeA
Virginia
VA
Systems tested 54
With detections 54
Above EPA limits 20 (37%)
% above MCL 37%
Most detected:
PFPeAPFHxAPFBAPFBS
Indiana
IN
Systems tested 55
With detections 55
Above EPA limits 19 (35%)
% above MCL 35%
Most detected:
PFPeAPFBSPFHxAPFBA
Minnesota
MN
Systems tested 87
With detections 87
Above EPA limits 17 (20%)
% above MCL 20%
Most detected:
PFBAPFHxSPFPeAPFOS
Maryland
MD
Systems tested 30
With detections 30
Above EPA limits 16 (53%)
% above MCL 53%
Most detected:
PFPeAPFHxAPFBSPFOA
New Hampshire
NH
Systems tested 18
With detections 18
Above EPA limits 16 (89%)
% above MCL 89%
Most detected:
PFOAPFHxAPFOSPFPeA
Delaware
DE
Systems tested 17
With detections 17
Above EPA limits 14 (82%)
% above MCL 82%
Most detected:
PFPeAPFHxAPFOAPFBS
Colorado
CO
Systems tested 38
With detections 38
Above EPA limits 13 (34%)
% above MCL 34%
Most detected:
PFPeAPFBAPFHxAPFBS
Oklahoma
OK
Systems tested 61
With detections 61
Above EPA limits 13 (21%)
% above MCL 21%
Most detected:
PFBAPFPeAPFHxAPFHxS
Oregon
OR
Systems tested 18
With detections 18
Above EPA limits 11 (61%)
% above MCL 61%
Most detected:
PFOSPFHxSPFBSPFOA
Rhode Island
RI
Systems tested 15
With detections 15
Above EPA limits 10 (67%)
% above MCL 67%
Most detected:
PFHxAPFPeAPFOAPFBS
Missouri
MO
Systems tested 71
With detections 71
Above EPA limits 9 (13%)
% above MCL 13%
Most detected:
PFBAPFHxSPFPeAPFBS
Iowa
IA
Systems tested 32
With detections 32
Above EPA limits 8 (25%)
% above MCL 25%
Most detected:
PFBAPFBSPFPeAPFHxS
Louisiana
LA
Systems tested 47
With detections 47
Above EPA limits 7 (15%)
% above MCL 15%
Most detected:
PFBAPFPeAPFOSPFBS
Michigan
MI
Systems tested 44
With detections 44
Above EPA limits 7 (16%)
% above MCL 16%
Most detected:
PFBAPFPeAPFBSPFHxS
Mississippi
MS
Systems tested 9
With detections 9
Above EPA limits 7 (78%)
% above MCL 78%
Most detected:
PFOSPFOAPFBSPFBA
Kansas
KS
Systems tested 34
With detections 34
Above EPA limits 5 (15%)
% above MCL 15%
Most detected:
PFBAPFBSPFHxSPFPeA
Maine
ME
Systems tested 10
With detections 10
Above EPA limits 5 (50%)
% above MCL 50%
Most detected:
PFHxAPFBAPFPeAPFHxS
New Mexico
NM
Systems tested 10
With detections 10
Above EPA limits 5 (50%)
% above MCL 50%
Most detected:
PFBSPFBA6:2 FTSPFOA
Alaska
AK
Systems tested 9
With detections 9
Above EPA limits 4 (44%)
% above MCL 44%
Most detected:
PFHxSPFHxAPFPeAPFOA
Nebraska
NE
Systems tested 7
With detections 7
Above EPA limits 4 (57%)
% above MCL 57%
Most detected:
PFHxSPFOSPFBSPFPeA
Utah
UT
Systems tested 16
With detections 16
Above EPA limits 4 (25%)
% above MCL 25%
Most detected:
PFBSPFPeAPFHxAPFHxS
Idaho
ID
Systems tested 8
With detections 8
Above EPA limits 3 (38%)
% above MCL 38%
Most detected:
PFPeAPFHxAPFBSPFHxS
Nevada
NV
Systems tested 10
With detections 10
Above EPA limits 3 (30%)
% above MCL 30%
Most detected:
PFHxAPFPeAPFOSPFBS
Montana
MT
Systems tested 5
With detections 5
Above EPA limits 2 (40%)
% above MCL 40%
Most detected:
PFBSPFOSPFHxSPFBA
South Dakota
SD
Systems tested 7
With detections 7
Above EPA limits 2 (29%)
% above MCL 29%
Most detected:
PFBAPFHxSPFOSPFBS
Arkansas
AR
Systems tested 10
With detections 10
Above EPA limits 1 (10%)
% above MCL 10%
Most detected:
PFBA6:2 FTSPFBSPFPeA
Vermont
VT
Systems tested 3
With detections 3
Above EPA limits 1 (33%)
% above MCL 33%
Most detected:
PFBAPFBSPFOS
Wyoming
WY
Systems tested 3
With detections 3
Above EPA limits 1 (33%)
% above MCL 33%
Most detected:
PFHxSPFBAPFOSPFHxA
Washington D.C.
DC
Systems tested 3
With detections 3
Above EPA limits 0 (0%)
% above MCL 0%
Most detected:
PFPeAPFHxA
Hawaii
HI
Systems tested 2
With detections 2
Above EPA limits 0 (0%)
% above MCL 0%
Most detected:
PFHxSPFPeA
North Dakota
ND
Systems tested 7
With detections 7
Above EPA limits 0 (0%)
% above MCL 0%
Most detected:
PFBAPFPeA