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.
6,028
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 452
With detections 452
Above EPA limits 164 (36%)
% above MCL 36%
Most detected:
lithiumPFHxSPFOSPFPeA
Florida
FL
Systems tested 219
With detections 219
Above EPA limits 157 (72%)
% above MCL 72%
Most detected:
PFOSPFBSPFPeAPFHxA
New Jersey
NJ
Systems tested 210
With detections 210
Above EPA limits 156 (74%)
% above MCL 74%
Most detected:
PFOAPFPeAPFHxAPFOS
Pennsylvania
PA
Systems tested 225
With detections 225
Above EPA limits 119 (53%)
% above MCL 53%
Most detected:
PFPeAPFBSlithiumPFHxA
North Carolina
NC
Systems tested 176
With detections 176
Above EPA limits 115 (65%)
% above MCL 65%
Most detected:
PFOSPFPeAPFHxAPFOA
Massachusetts
MA
Systems tested 148
With detections 148
Above EPA limits 106 (72%)
% above MCL 72%
Most detected:
PFPeAPFHxAPFOAPFBS
Texas
TX
Systems tested 1072
With detections 1072
Above EPA limits 103 (10%)
% above MCL 10%
Most detected:
lithiumPFBAPFPeAPFHxA
Alabama
AL
Systems tested 157
With detections 157
Above EPA limits 79 (50%)
% above MCL 50%
Most detected:
PFBSPFBAPFOSPFHxA
South Carolina
SC
Systems tested 107
With detections 107
Above EPA limits 68 (64%)
% above MCL 64%
Most detected:
PFPeAPFHxAPFBSPFOS
Ohio
OH
Systems tested 204
With detections 204
Above EPA limits 59 (29%)
% above MCL 29%
Most detected:
lithiumPFBAPFPeAPFBS
New York
NY
Systems tested 129
With detections 129
Above EPA limits 52 (40%)
% above MCL 40%
Most detected:
PFPeAlithiumPFOAPFHxA
Georgia
GA
Systems tested 102
With detections 102
Above EPA limits 42 (41%)
% above MCL 41%
Most detected:
PFBSPFPeAPFHxAPFOS
Tennessee
TN
Systems tested 93
With detections 93
Above EPA limits 37 (40%)
% above MCL 40%
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 98
With detections 98
Above EPA limits 34 (35%)
% above MCL 35%
Most detected:
PFBSlithiumPFPeAPFHxA
Kentucky
KY
Systems tested 107
With detections 107
Above EPA limits 32 (30%)
% above MCL 30%
Most detected:
PFPeAPFBAPFHxAPFOA
Illinois
IL
Systems tested 199
With detections 199
Above EPA limits 27 (14%)
% above MCL 14%
Most detected:
lithiumPFBAPFPeAPFHxA
Arizona
AZ
Systems tested 145
With detections 145
Above EPA limits 25 (17%)
% above MCL 17%
Most detected:
lithiumPFBSPFPeAPFHxA
Wisconsin
WI
Systems tested 78
With detections 78
Above EPA limits 23 (29%)
% above MCL 29%
Most detected:
lithiumPFHxSPFBSPFBA
West Virginia
WV
Systems tested 46
With detections 46
Above EPA limits 21 (46%)
% above MCL 46%
Most detected:
PFOAPFBSPFHxAlithium
Virginia
VA
Systems tested 70
With detections 70
Above EPA limits 20 (29%)
% above MCL 29%
Most detected:
PFPeAPFHxAPFBAlithium
Indiana
IN
Systems tested 93
With detections 93
Above EPA limits 19 (20%)
% above MCL 20%
Most detected:
lithiumPFPeAPFBSPFHxA
Minnesota
MN
Systems tested 149
With detections 149
Above EPA limits 17 (11%)
% above MCL 11%
Most detected:
lithiumPFBAPFHxSPFPeA
Maryland
MD
Systems tested 50
With detections 50
Above EPA limits 16 (32%)
% above MCL 32%
Most detected:
PFPeAlithiumPFHxAPFBS
New Hampshire
NH
Systems tested 23
With detections 23
Above EPA limits 16 (70%)
% above MCL 70%
Most detected:
PFOAPFHxAlithiumPFOS
Delaware
DE
Systems tested 25
With detections 25
Above EPA limits 14 (56%)
% above MCL 56%
Most detected:
PFPeAPFHxAPFOAPFBS
Colorado
CO
Systems tested 100
With detections 100
Above EPA limits 13 (13%)
% above MCL 13%
Most detected:
lithiumPFPeAPFBAPFHxA
Oklahoma
OK
Systems tested 101
With detections 101
Above EPA limits 13 (13%)
% above MCL 13%
Most detected:
lithiumPFBAPFPeAPFHxA
Oregon
OR
Systems tested 31
With detections 31
Above EPA limits 11 (35%)
% above MCL 35%
Most detected:
lithiumPFOSPFHxSPFBS
Rhode Island
RI
Systems tested 15
With detections 15
Above EPA limits 10 (67%)
% above MCL 67%
Most detected:
PFHxAPFPeAPFOAPFBS
Missouri
MO
Systems tested 163
With detections 163
Above EPA limits 9 (6%)
% above MCL 6%
Most detected:
lithiumPFBAPFHxSPFPeA
Iowa
IA
Systems tested 127
With detections 127
Above EPA limits 8 (6%)
% above MCL 6%
Most detected:
lithiumPFBAPFBSPFPeA
Louisiana
LA
Systems tested 220
With detections 220
Above EPA limits 7 (3%)
% above MCL 3%
Most detected:
lithiumPFBAPFPeAPFOS
Michigan
MI
Systems tested 87
With detections 87
Above EPA limits 7 (8%)
% above MCL 8%
Most detected:
lithiumPFBAPFPeAPFBS
Mississippi
MS
Systems tested 161
With detections 161
Above EPA limits 7 (4%)
% above MCL 4%
Most detected:
lithiumPFOSPFOAPFBS
Kansas
KS
Systems tested 89
With detections 89
Above EPA limits 5 (6%)
% above MCL 6%
Most detected:
lithiumPFBAPFBSPFHxS
Maine
ME
Systems tested 14
With detections 14
Above EPA limits 5 (36%)
% above MCL 36%
Most detected:
PFHxAlithiumPFBAPFPeA
New Mexico
NM
Systems tested 71
With detections 71
Above EPA limits 5 (7%)
% above MCL 7%
Most detected:
lithiumPFBSPFBA6:2 FTS
Alaska
AK
Systems tested 10
With detections 10
Above EPA limits 4 (40%)
% above MCL 40%
Most detected:
PFHxSPFHxAPFPeAPFOA
Nebraska
NE
Systems tested 52
With detections 52
Above EPA limits 4 (8%)
% above MCL 8%
Most detected:
lithiumPFHxSPFOSPFBS
Utah
UT
Systems tested 91
With detections 91
Above EPA limits 4 (4%)
% above MCL 4%
Most detected:
lithiumPFBSPFPeAPFHxA
Idaho
ID
Systems tested 41
With detections 41
Above EPA limits 3 (7%)
% above MCL 7%
Most detected:
lithiumPFPeAPFHxAPFBS
Nevada
NV
Systems tested 51
With detections 51
Above EPA limits 3 (6%)
% above MCL 6%
Most detected:
lithiumPFHxAPFPeAPFOS
Montana
MT
Systems tested 28
With detections 28
Above EPA limits 2 (7%)
% above MCL 7%
Most detected:
lithiumPFBSPFOSPFHxS
South Dakota
SD
Systems tested 42
With detections 42
Above EPA limits 2 (5%)
% above MCL 5%
Most detected:
lithiumPFBAPFHxSPFOS
Arkansas
AR
Systems tested 57
With detections 57
Above EPA limits 1 (2%)
% above MCL 2%
Most detected:
lithiumPFBA6:2 FTSPFBS
Vermont
VT
Systems tested 3
With detections 3
Above EPA limits 1 (33%)
% above MCL 33%
Most detected:
PFBAPFBSPFOS
Wyoming
WY
Systems tested 18
With detections 18
Above EPA limits 1 (6%)
% above MCL 6%
Most detected:
lithiumPFHxSPFBAPFOS
Washington D.C.
DC
Systems tested 3
With detections 3
Above EPA limits 0 (0%)
% above MCL 0%
Most detected:
PFPeAPFHxAlithium
Hawaii
HI
Systems tested 2
With detections 2
Above EPA limits 0 (0%)
% above MCL 0%
Most detected:
PFHxSPFPeA
North Dakota
ND
Systems tested 34
With detections 34
Above EPA limits 0 (0%)
% above MCL 0%
Most detected:
lithiumPFBAPFPeA