PFAS Tracker
Tracking "forever chemicals" (PFAS) in America's drinking water from EPA's Fifth Unregulated Contaminant Monitoring Rule (UCMR5), which screens 29 PFAS compounds across public water systems in all 50 states (2023–2025). See our methodology.
10,252
Systems Tested
3,528
Systems with PFAS
34%
Detection Rate
PFAS Contaminants Tested
29 PFAS compounds monitored under UCMR5.
| Contaminant | Samples | Detections | Detection Rate | Systems Detected | Max Level |
|---|---|---|---|---|---|
| PFPeA | 64,181 | 6,832 | 10.64% | 2,032 | 358.00 ppt |
| PFHxA | 64,195 | 5,899 | 9.19% | 1,778 | 260.00 ppt |
| PFBS | 64,196 | 5,524 | 8.6% | 1,674 | 290.00 ppt |
| PFBA | 64,187 | 5,256 | 8.19% | 1,893 | 1700.00 ppt |
| PFOS | 64,200 | 4,378 | 6.82% | 1,336 | 490.00 ppt |
| PFOA | 64,200 | 4,270 | 6.65% | 1,288 | 235.00 ppt |
| PFHxS | 64,190 | 3,170 | 4.94% | 1,021 | 250.20 ppt |
| PFHpA | 64,204 | 1,493 | 2.33% | 553 | 72.70 ppt |
| 6:2 FTS | 64,191 | 252 | 0.39% | 182 | 672.00 ppt |
| PFNA | 64,203 | 173 | 0.27% | 83 | 99.80 ppt |
| HFPO-DA | 64,206 | 117 | 0.18% | 47 | 140.00 ppt |
| PFPeS | 64,205 | 99 | 0.15% | 50 | 36.40 ppt |
| PFDA | 64,204 | 29 | 0.05% | 15 | 12.40 ppt |
| 8:2 FTS | 64,196 | 12 | 0.02% | 10 | 41.90 ppt |
| PFUnA | 64,202 | 12 | 0.02% | 6 | 22.20 ppt |
| PFHpS | 64,205 | 6 | 0.01% | 5 | 5.50 ppt |
| NFDHA | 64,199 | 5 | 0.01% | 4 | 39.00 ppt |
| ADONA | 64,205 | 4 | 0.01% | 3 | 8.10 ppt |
| PFDoA | 64,195 | 4 | 0.01% | 4 | 4.70 ppt |
| PFMPA | 64,205 | 3 | 0% | 2 | 10.40 ppt |
| 4:2 FTS | 64,205 | 2 | 0% | 2 | 7.60 ppt |
| NMeFOSAA | 64,585 | 2 | 0% | 1 | 14.80 ppt |
| PFMBA | 64,205 | 2 | 0% | 1 | 3.00 ppt |
| 9Cl-PF3ONS | 64,178 | 1 | 0% | 1 | 3.40 ppt |
| NEtFOSAA | 64,584 | 1 | 0% | 1 | 6.90 ppt |
| 11Cl-PF3OUdS | 64,206 | 0 | 0% | 0 | - |
| PFEESA | 64,205 | 0 | 0% | 0 | - |
| PFTA | 64,585 | 0 | 0% | 0 | - |
| PFTrDA | 64,584 | 0 | 0% | 0 | - |
PFAS by State
| State | Tested | Detected | Detection Rate |
|---|---|---|---|
| Texas | 1,147 | 610 | 53.2% |
| California | 694 | 231 | 33.3% |
| Florida | 402 | 190 | 47.3% |
| Pennsylvania | 389 | 173 | 44.5% |
| New Jersey | 264 | 172 | 65.2% |
| North Carolina | 287 | 143 | 49.8% |
| Massachusetts | 263 | 143 | 54.4% |
| Ohio | 346 | 141 | 40.8% |
| Illinois | 487 | 123 | 25.3% |
| Alabama | 306 | 117 | 38.2% |
| New York | 332 | 98 | 29.5% |
| South Carolina | 164 | 90 | 54.9% |
| Tennessee | 277 | 87 | 31.4% |
| Minnesota | 196 | 87 | 44.4% |
| Kentucky | 231 | 87 | 37.7% |
| Georgia | 254 | 77 | 30.3% |
| Missouri | 230 | 71 | 30.9% |
| Washington | 247 | 66 | 26.7% |
| Oklahoma | 166 | 61 | 36.7% |
| Arizona | 152 | 57 | 37.5% |
| Indiana | 229 | 55 | 24% |
| Virginia | 171 | 54 | 31.6% |
| Wisconsin | 202 | 51 | 25.2% |
| Louisiana | 265 | 47 | 17.7% |
| Michigan | 318 | 44 | 13.8% |
| Connecticut | 63 | 40 | 63.5% |
| Puerto Rico | 99 | 38 | 38.4% |
| Colorado | 163 | 37 | 22.7% |
| West Virginia | 102 | 34 | 33.3% |
| Kansas | 103 | 34 | 33% |
| Iowa | 152 | 32 | 21.1% |
| Maryland | 83 | 30 | 36.1% |
| Oregon | 125 | 18 | 14.4% |
| New Hampshire | 51 | 18 | 35.3% |
| Delaware | 35 | 17 | 48.6% |
| Utah | 129 | 16 | 12.4% |
| Rhode Island | 29 | 15 | 51.7% |
| Nevada | 57 | 10 | 17.5% |
| New Mexico | 72 | 10 | 13.9% |
| Maine | 41 | 10 | 24.4% |
| Arkansas | 172 | 10 | 5.8% |
| Mississippi | 238 | 9 | 3.8% |
| Alaska | 30 | 9 | 30% |
| Idaho | 60 | 8 | 13.3% |
| EPA Region 9 — Tribal Water Systems | 41 | 8 | 19.5% |
| South Dakota | 49 | 7 | 14.3% |
| Nebraska | 53 | 7 | 13.2% |
| North Dakota | 38 | 7 | 18.4% |
| Montana | 45 | 5 | 11.1% |
| Wyoming | 33 | 3 | 9.1% |
| Vermont | 37 | 3 | 8.1% |
| Guam | 5 | 3 | 60% |
| District of Columbia | 3 | 3 | 100% |
| Navajo Nation | 13 | 2 | 15.4% |
| Hawaii | 45 | 2 | 4.4% |
| EPA Region 6 — Tribal Water Systems | 18 | 2 | 11.1% |
| US Virgin Islands | 3 | 1 | 33.3% |
| Northern Mariana Islands | 2 | 1 | 50% |
| American Samoa | 1 | 1 | 100% |
| EPA Region 8 — Tribal Water Systems | 13 | 1 | 7.7% |
| EPA Region 5 — Tribal Water Systems | 13 | 1 | 7.7% |
| EPA Region 1 — Tribal Water Systems | 2 | 1 | 50% |
| EPA Region 10 — Tribal Water Systems | 10 | 0 | 0% |
| EPA Region 7 — Tribal Water Systems | 1 | 0 | 0% |
| EPA Region 4 — Tribal Water Systems | 2 | 0 | 0% |
| EPA Region 2 — Tribal Water Systems | 2 | 0 | 0% |
Water Systems with Most PFAS
#1 Emmaus Borough Public Water Emmaus, PA
13 PFAS
#2 Emerald Coast Utilities Authority (Ecua) Pensacola, FL
12 PFAS
#3 Mdwasa - Main System Miami, FL
11 PFAS
#4 Georgetown Water Department Georgetown, DE
11 PFAS
#5 Gwa Northern Water System Mangilao, GU
11 PFAS
#6 North Bay Village, City Of North Bay Village, FL
11 PFAS
#7 Hialeah, City Of Hialeah, FL
11 PFAS
#8 City of Cameron Cameron, TX
10 PFAS
#9 Running Springs Water District Running Springs, CA
10 PFAS
#10 Great Bend, City Of Great Bend, KS
10 PFAS
#11 Yeshiva Farm Settlement Mt. Kisco, NY
10 PFAS
#12 Miami Beach, City Of Miami Beach, FL
10 PFAS
#13 Bal Harbour Village Bal Harbour, FL
10 PFAS
#14 Pewaukee City Water and Sewer Utility Pewaukee, WI
10 PFAS
#15 City of Atwater Atwater, CA
10 PFAS
#16 City of Fresno Fresno, CA
10 PFAS
#17 Duxbury Water Department Duxbury, MA
10 PFAS
#18 Suffolk County Water Authority Hauppauge, NY
10 PFAS
#19 City of Clovis Clovis, CA
10 PFAS
#20 Robeson County Water System Lumberton, NC
10 PFAS