PFAS in Puerto Rico tap water
28 of 99 tested systems measured above the federal limit. 39 had a detection of any kind.
Every public water system below was required by the EPA to test for 29 PFAS compounds. Sorted by the highest PFOA or PFOS reading, worst first. Find yours for the full set of readings and what removes them.
| Water system | Highest PFOA | Highest PFOS | Found | Against the 4 ppt limit |
|---|---|---|---|---|
| Aibonito la Plata | none detected | 46.7 ppt | 6 of 29 | Above |
| Ponce Urbano | 5.1 ppt | 25.6 ppt | 8 of 29 | Above |
| Experimental | 22 ppt | 5.4 ppt | 7 of 29 | Above |
| U.c.p.r | none detected | 17 ppt | 4 of 29 | Above |
| Upr Cayey | none detected | 16.4 ppt | 4 of 29 | Above |
| Patillas Urbano | none detected | 14.3 ppt | 4 of 29 | Above |
| Jacaguas | none detected | 12.4 ppt | 3 of 29 | Above |
| Metropolitano | 10.9 ppt | 7.8 ppt | 8 of 29 | Above |
| Santa Isabel Urbano | none detected | 10.3 ppt | 4 of 29 | Above |
| Cidra Urbano | none detected | 9.8 ppt | 5 of 29 | Above |
| Salinas Urbano | none detected | 9.6 ppt | 5 of 29 | Above |
| Caguas Norte | none detected | 7.4 ppt | 1 of 29 | Above |
| Las Bocas | none detected | 7.2 ppt | 2 of 29 | Above |
| Aruz | none detected | 7.1 ppt | 2 of 29 | Above |
| Manati East | none detected | 6.7 ppt | 1 of 29 | Above |
| Morovis Urbano | none detected | 6.7 ppt | 4 of 29 | Above |
| Guayanilla Urbano | none detected | 5.5 ppt | 2 of 29 | Above |
| Las Piedras Humacao | none detected | 5.4 ppt | 1 of 29 | Above |
| Aguadilla | none detected | 5.3 ppt | 5 of 29 | Above |
| Juncos - Ceiba Sur | 4.8 ppt | none detected | 2 of 29 | Above |
| Maunabo Urbano | none detected | 4.8 ppt | 2 of 29 | Above |
| Dorado Urbano | none detected | 4.6 ppt | 1 of 29 | Above |
| U.s. Army, Fort Buchanan | none detected | 4.6 ppt | 2 of 29 | Above |
| Arecibo Urbano | none detected | 4.4 ppt | 2 of 29 | Above |
| Gurabo Urbano | none detected | 4.4 ppt | 4 of 29 | Above |
| Vega Baja Urbano | none detected | 4.4 ppt | 3 of 29 | Above |
| Aibonito Urbano | none detected | 4.3 ppt | 2 of 29 | Above |
| Aguas Buenas Urbano | 4.1 ppt | 4.2 ppt | 2 of 29 | Above |
| Aceitunas | none detected | none detected | 0 of 29 | Within |
| Adjuntas Urbano | none detected | none detected | 0 of 29 | Within |
| Bajadero | none detected | none detected | 0 of 29 | Within |
| Barceloneta Urbano | none detected | none detected | 0 of 29 | Within |
| Barranquitas Urbano | none detected | none detected | 0 of 29 | Within |
| Bo Nuevo | none detected | none detected | 0 of 29 | Within |
| Bo. Jacaboa- Higuero | none detected | none detected | 0 of 29 | Within |
| Cabo Rojo | none detected | none detected | 0 of 29 | Within |
| Caguas Sur | none detected | none detected | 0 of 29 | Within |
| Cayey Urbano | none detected | none detected | 1 of 29 | Within |
| Cedro Arriba | none detected | none detected | 0 of 29 | Within |
| Cerrillos | none detected | none detected | 0 of 29 | Within |
| Ciales Urbano | none detected | none detected | 0 of 29 | Within |
| Cienega | none detected | none detected | 0 of 29 | Within |
| Coamo Urbano | none detected | none detected | 0 of 29 | Within |
| Cocos | none detected | none detected | 0 of 29 | Within |
| Comerio Urbano | none detected | none detected | 2 of 29 | Within |
| Coqui | none detected | none detected | 0 of 29 | Within |
| Corozal Urbano | none detected | none detected | 1 of 29 | Within |
| Cotto Laurel | none detected | none detected | 0 of 29 | Within |
| Deportivo | none detected | none detected | 0 of 29 | Within |
| El Rosario | none detected | none detected | 0 of 29 | Within |
| El Yunque | none detected | none detected | 0 of 29 | Within |
| Ensenada | none detected | none detected | 0 of 29 | Within |
| Fajardo Ceiba | none detected | none detected | 0 of 29 | Within |
| Florida Urbano | none detected | none detected | 0 of 29 | Within |
| Garrochales | none detected | none detected | 0 of 29 | Within |
| Garzas | none detected | none detected | 0 of 29 | Within |
| Guanica Urbano | none detected | none detected | 0 of 29 | Within |
| Guayama Urbano | none detected | none detected | 0 of 29 | Within |
| Hatillo-camuy | none detected | none detected | 0 of 29 | Within |
| Hormiguero | none detected | none detected | 0 of 29 | Within |
| Isabela | none detected | none detected | 1 of 29 | Within |
| Jagual | none detected | none detected | 0 of 29 | Within |
| Jaguas Pesas (pozas) | none detected | none detected | 0 of 29 | Within |
| Jayuya Urbano | none detected | none detected | 2 of 29 | Within |
| La Grua | none detected | none detected | 0 of 29 | Within |
| Lago Guajataca | none detected | none detected | 0 of 29 | Within |
| Lajas | none detected | none detected | 0 of 29 | Within |
| Lares Espino | none detected | none detected | 1 of 29 | Within |
| Lares Urbano | none detected | none detected | 0 of 29 | Within |
| Las Marias | none detected | none detected | 0 of 29 | Within |
| Luquillo Urbano | none detected | none detected | 0 of 29 | Within |
| Maguayo | none detected | none detected | 1 of 29 | Within |
| Maricao | none detected | none detected | 0 of 29 | Within |
| Mayaguez | none detected | none detected | 0 of 29 | Within |
| Mulas | none detected | none detected | 0 of 29 | Within |
| Negros | none detected | none detected | 0 of 29 | Within |
| Orocovis Urbano | none detected | none detected | 0 of 29 | Within |
| Penuelas | none detected | none detected | 0 of 29 | Within |
| Pfizer Pharmaceuticals | none detected | none detected | 0 of 29 | Within |
| Piedras Blancas | none detected | none detected | 0 of 29 | Within |
| Plata I Y II | none detected | none detected | 0 of 29 | Within |
| Pugnado | none detected | none detected | 3 of 29 | Within |
| Quebrada | none detected | none detected | 0 of 29 | Within |
| Quebradillas Urbano | none detected | none detected | 0 of 29 | Within |
| Regional Villalba Toa Vaca | none detected | none detected | 0 of 29 | Within |
| Rio Blanco,vieques,culedra | none detected | none detected | 0 of 29 | Within |
| Roncador | none detected | none detected | 0 of 29 | Within |
| Sabana Grande | none detected | none detected | 0 of 29 | Within |
| Sabana Grande, Pr | none detected | none detected | 1 of 29 | Within |
| Sabana Hoyos | none detected | none detected | 0 of 29 | Within |
| San Lorenzo Urbano | none detected | none detected | 0 of 29 | Within |
| San Sebastian | none detected | none detected | 0 of 29 | Within |
| Santa Isabel | none detected | none detected | 0 of 29 | Within |
| Santana | none detected | none detected | 0 of 29 | Within |
| Superacueducto | none detected | none detected | 0 of 29 | Within |
| Utuado Urbano | none detected | none detected | 0 of 29 | Within |
| Veguitas Gripinas | none detected | none detected | 0 of 29 | Within |
| Yabucoa Urbano | none detected | none detected | 1 of 29 | Within |
| Yauco | none detected | none detected | 2 of 29 | Within |
All 99 systems the EPA tested in Puerto Rico, every one of them with its own page. Each was tested for 29 PFAS compounds.
Other states
AlabamaAlaskaArizonaArkansasCaliforniaColoradoConnecticutDelawareDistrict of ColumbiaFloridaGeorgiaHawaiiIdahoIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMichiganMinnesotaMississippiMissouriMontanaNebraskaNevadaNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNorth DakotaOhioOklahomaOregonPennsylvaniaRhode IslandSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirginiaWashingtonWest VirginiaWisconsinWyomingGuamthe U.S. Virgin IslandsAmerican Samoathe Northern Mariana Islandsthe Navajo Nation
Graded water filters you can buy today
The best graded product in each filter type we cover.
- AquaTru AquaTru Under Sink Under SinkExcellent 100/100Check price
- Watts Water Technologies Watts BB-S101 Whole Home SystemExcellent 95/100Check price
- VOSS VOSS stillExcellent 100/100Check price
- LARQ LARQ PitcherExcellent 100/100Check price
We may earn a commission on these links, at no cost to you. It never changes a grade.
Source, the EPA’s fifth Unregulated Contaminant Monitoring Rule, final dataset published 2026-10-15. Original data →