Systems with a yearly average above an EPA comparison level
15.6%15 of 96 active community water systems
All 96 systems met the sampling requirement for a yearly average. Of those systems, 15 had at least one yearly average above an EPA comparison level and 81 did not.
EPA-based study benchmark: a fixed, unrounded research cutoff used to reproduce EPA’s final UCMR 5 technical-assistance classification based on the April 2024 federal levels. It is not a current federal or state standard. The label does not determine compliance, household exposure, or health risk.
State rules: The labels on this page use fixed research cutoffs based on the April 2024 federal levels. Puerto Rico may use different current standards or guidance. These UCMR 5 results do not determine current federal or state compliance. Find the official Puerto Rico drinking-water program →
Check your area
Find your water system
A ZIP code finds possible public water systems for an area; it cannot identify the supplier for a specific home. Confirm the provider using a water bill or utility record.
Compound summary
System counts in Puerto Rico
Each count shows how many included water systems had a yearly average above the named EPA comparison level.
| EPA rounding cutoff | Systems above comparison level | Water systems included | Percent |
|---|---|---|---|
| PFOA: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 1 | 96 | 1.0% |
| PFOS: 4 ppt level; unrounded average ≥4.05 ppt after applying EPA rounding | 15 | 96 | 15.6% |
| PFHxS: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 1 | 96 | 1.0% |
| PFNA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 96 | 0.0% |
| HFPO-DA: 10 ppt level; unrounded average ≥15 ppt after applying EPA rounding | 0 | 96 | 0.0% |
| Hazard Index: 1 level; unrounded index ≥1.5 and at least two detected components | 1 | 96 | 1.0% |
System directory
Community water systems with complete monitoring
“Complete monitoring” means at least one sampling location had every required sample needed to calculate a yearly average. It does not mean every location or home was tested. Each PWSID appears once, preventing double counting across ZIP associations.
| Public water system | PWSID | Population served | Primary source | Sampling locations | EPA comparison result |
|---|---|---|---|---|---|
| ACEITUNAS | PR0004654 | 9,030 | Surface water | 1 | No available average above comparison levels |
| ADJUNTAS URBANO | PR0004204 | 2,870 | Surface water | 1 | No available average above comparison levels |
| AGUADILLA | PR0003293 | 124,782 | Surface water | 14 | Above an EPA comparison level |
| AGUAS BUENAS URBANO | PR0005046 | 13,233 | Surface water | 2 | No available average above comparison levels |
| AIBONITO LA PLATA | PR0004545 | 16,354 | Surface water | 4 | Above an EPA comparison level |
| AIBONITO URBANO | PR0004955 | 5,580 | Surface water | 3 | Above an EPA comparison level |
| ARECIBO URBANO | PR0002652 | 61,626 | Surface water | 11 | No available average above comparison levels |
| ARUZ | PR0003834 | 5,105 | Ground water | 3 | Above an EPA comparison level |
| BAJADERO | PR0003222 | 3,402 | Ground water | 1 | No available average above comparison levels |
| BARCELONETA URBANO | PR0002722 | 16,404 | Surface water | 3 | No available average above comparison levels |
| BARRANQUITAS URBANO | PR0004605 | 3,538 | Surface water | 1 | No available average above comparison levels |
| BO NUEVO | PR0005557 | 4,961 | Surface water | 1 | No available average above comparison levels |
| BO. JACABOA- HIGUERO | PR0556075 | 70 | Ground water | 1 | No available average above comparison levels |
| CABO ROJO | PR0003373 | 20,356 | Surface water | 1 | No available average above comparison levels |
| CAGUAS NORTE | PR0005086 | 47,352 | Surface water | 2 | No available average above comparison levels |
| CAGUAS SUR | PR0005066 | 34,261 | Surface water | 1 | No available average above comparison levels |
| CAYEY URBANO | PR0004635 | 18,335 | Surface water | 1 | No available average above comparison levels |
| CEDRO ARRIBA | PR0005517 | 5,444 | Surface water | 1 | No available average above comparison levels |
| CERRILLOS | PR0004634 | 5,658 | Surface water | 1 | No available average above comparison levels |
| CIALES URBANO | PR0002752 | 4,841 | Surface water | 1 | No available average above comparison levels |
| CIDRA URBANO | PR0004695 | 34,424 | Surface water | 1 | Above an EPA comparison level |
| CIENEGA | PR0003862 | 3,952 | Ground water | 2 | No available average above comparison levels |
| COAMO URBANO | PR0003914 | 4,603 | Surface water | 1 | No available average above comparison levels |
| COCOS | PR0004895 | 9,930 | Ground water | 6 | No available average above comparison levels |
| COMERIO URBANO | PR0004705 | 14,912 | Surface water | 3 | No available average above comparison levels |
| COQUI | PR0004915 | 6,237 | Ground water | 4 | No available average above comparison levels |
| COROZAL URBANO | PR0005487 | 6,162 | Surface water | 1 | No available average above comparison levels |
| COTTO LAUREL | PR0004524 | 12,979 | Surface water | 1 | No available average above comparison levels |
| DEPORTIVO | PR0004444 | 3,420 | Ground water | 2 | No available average above comparison levels |
| DORADO URBANO | PR0005607 | 37,244 | Surface water | 2 | No available average above comparison levels |
| EL ROSARIO | PR0003423 | 2,374 | Ground water | 1 | No available average above comparison levels |
| EL YUNQUE | PR0005296 | 68,114 | Surface water | 1 | No available average above comparison levels |
| ENSENADA | PR0004084 | 6,130 | Ground water | 2 | No available average above comparison levels |
| EXPERIMENTAL | PR0004604 | 6,445 | Ground water | 5 | Above an EPA comparison level |
| FAJARDO CEIBA | PR0005306 | 59,044 | Surface water | 1 | No available average above comparison levels |
| FLORIDA URBANO | PR0002732 | 10,405 | Ground water | 6 | No available average above comparison levels |
| GARROCHALES | PR0002782 | 7,465 | Ground water | 1 | No available average above comparison levels |
| GARZAS | PR0004584 | 3,354 | Surface water | 1 | No available average above comparison levels |
| GUANICA URBANO | PR0004074 | 6,881 | Ground water | 2 | No available average above comparison levels |
| GUAYAMA URBANO | PR0004745 | 37,076 | Surface water | 2 | No available average above comparison levels |
| GUAYANILLA URBANO | PR0004054 | 7,302 | Ground water | 3 | No available average above comparison levels |
| GURABO URBANO | PR0005096 | 25,469 | Surface water | 2 | No available average above comparison levels |
| HATILLO-CAMUY | PR0002662 | 28,935 | Surface water | 1 | No available average above comparison levels |
| HORMIGUERO | PR0003383 | 10,587 | Ground water | 5 | No available average above comparison levels |
| ISABELA | PR0002672 | 49,937 | Surface water | 1 | No available average above comparison levels |
| JACAGUAS | PR0004534 | 4,261 | Ground water | 3 | Above an EPA comparison level |
| JAGUAL | PR0005416 | 4,021 | Surface water | 1 | No available average above comparison levels |
| JAGUAS PESAS (POZAS) | PR0003802 | 4,699 | Surface water | 1 | No available average above comparison levels |
| JAYUYA URBANO | PR0002712 | 7,746 | Surface water | 1 | No available average above comparison levels |
| JUNCOS - CEIBA SUR | PR0005166 | 36,835 | Surface water | 3 | No available average above comparison levels |
| LA GRUA | PR0005496 | 3,578 | Ground water | 2 | No available average above comparison levels |
| LAGO GUAJATACA | PR0003772 | 10,018 | Surface water | 1 | No available average above comparison levels |
| LAJAS | PR0003343 | 47,350 | Surface water | 2 | No available average above comparison levels |
| LARES ESPINO | PR0003872 | 16,896 | Surface water | 1 | No available average above comparison levels |
| LARES URBANO | PR0002692 | 12,138 | Surface water | 1 | No available average above comparison levels |
| LAS BOCAS | PR0004945 | 11,022 | Surface water | 9 | Above an EPA comparison level |
| LAS MARIAS | PR0003363 | 7,193 | Surface water | 1 | No available average above comparison levels |
| LAS PIEDRAS HUMACAO | PR0005376 | 38,897 | Surface water | 2 | No available average above comparison levels |
| LUQUILLO URBANO | PR0005316 | 9,001 | Surface water | 1 | No available average above comparison levels |
| MAGUAYO | PR0005597 | 30,235 | Surface water purchased | 1 | No available average above comparison levels |
| MANATI EAST | PR0003262 | 13,580 | Surface water | 3 | Above an EPA comparison level |
| MARICAO | PR0003353 | 3,455 | Surface water | 1 | No available average above comparison levels |
| MAUNABO URBANO | PR0004815 | 9,380 | Surface water | 5 | Above an EPA comparison level |
| MAYAGUEZ | PR0003283 | 152,342 | Surface water | 12 | No available average above comparison levels |
| METROPOLITANO | PR0002591 | 1,084,637 | Surface water | 5 | Above an EPA comparison level |
| MOROVIS URBANO | PR0002762 | 20,927 | Surface water | 2 | No available average above comparison levels |
| MULAS | PR0556015 | 652 | Surface water | 1 | No available average above comparison levels |
| NEGROS | PR0005537 | 14,939 | Surface water | 1 | No available average above comparison levels |
| OROCOVIS URBANO | PR0004044 | 16,992 | Surface water | 2 | No available average above comparison levels |
| PATILLAS URBANO | PR0004835 | 32,222 | Surface water | 6 | Above an EPA comparison level |
| PENUELAS | PR0004324 | 17,326 | Surface water | 3 | No available average above comparison levels |
| PIEDRAS BLANCAS | PR0004474 | 3,351 | Ground water | 1 | No available average above comparison levels |
| PLATA I Y II | PR0003296 | 3,978 | Ground water | 2 | No available average above comparison levels |
| PONCE URBANO | PR0003824 | 113,972 | Surface water | 23 | Above an EPA comparison level |
| PUGNADO | PR0002972 | 3,591 | Ground water | 2 | No available average above comparison levels |
| QUEBRADA | PR0002872 | 9,377 | Surface water | 1 | No available average above comparison levels |
| QUEBRADILLAS URBANO | PR0002682 | 27,760 | Surface water | 2 | No available average above comparison levels |
| REGIONAL VILLALBA TOA VACA | PR0004664 | 34,259 | Surface water | 1 | No available average above comparison levels |
| RIO BLANCO,VIEQUES,CULEDRA | PR0005386 | 79,822 | Surface water | 2 | No available average above comparison levels |
| RONCADOR | PR0003142 | 4,734 | Surface water | 1 | No available average above comparison levels |
| SABANA GRANDE | PR0003192 | 1,762 | Surface water | 1 | No available average above comparison levels |
| SABANA GRANDE, PR | PR0003333 | 25,832 | Surface water | 2 | No available average above comparison levels |
| SABANA HOYOS | PR0002822 | 15,948 | Surface water | 1 | No available average above comparison levels |
| SALINAS URBANO | PR0004885 | 8,977 | Ground water | 4 | Above an EPA comparison level |
| SAN LORENZO URBANO | PR0005106 | 26,470 | Surface water | 1 | No available average above comparison levels |
| SAN SEBASTIAN | PR0003303 | 25,752 | Surface water | 1 | No available average above comparison levels |
| SANTA ISABEL | PR0003712 | 3,402 | Surface water | 1 | No available average above comparison levels |
| SANTA ISABEL URBANO | PR0003904 | 39,925 | Ground water | 9 | Above an EPA comparison level |
| SANTANA | PR0002832 | 19,657 | Surface water | 2 | No available average above comparison levels |
| SUPERACUEDUCTO | PR0002000 | 25 | Surface water | 1 | No available average above comparison levels |
| U.S. ARMY, FORT BUCHANAN | PR0132051 | 6,411 | Surface water | 2 | No available average above comparison levels |
| UTUADO URBANO | PR0002702 | 13,070 | Surface water | 1 | No available average above comparison levels |
| VEGA BAJA URBANO | PR0002772 | 26,935 | Surface water | 3 | No available average above comparison levels |
| VEGUITAS GRIPINAS | PR0238082 | 130 | Surface water | 1 | No available average above comparison levels |
| YABUCOA URBANO | PR0005196 | 14,728 | Surface water | 1 | No available average above comparison levels |
| YAUCO | PR0004314 | 35,639 | Surface water | 2 | No available average above comparison levels |
How the count works
What is included
Each active community water system with enough required samples for a yearly average is counted once, even if it is linked with several ZIP codes. Private wells are excluded, and UCMR 5 did not comprehensively monitor every small system.