State rankings
Puerto Rico water-system rankings
Lowest-scoring systems in Puerto Rico
Ranked lowest score first. Population shown for context.
1 METROPOLITANO SAN JUAN, PR · ~1,077,332 served 45 2 PONCE URBANO PONCE, PR · ~111,926 served 50 3 EXPERIMENTAL JUANA DIAZ, PR · ~6,427 served 55 4 SANTA ISABEL URBANO SANTA ISABEL, PR · ~39,884 served 67 5 JACAGUAS JUANA DIAZ, PR · ~4,269 served 67 6 CAGUAS NORTE CAGUAS, PR · ~46,530 served 71 7 ARUZ JUANA DIAZ, PR · ~5,097 served 73 8 MOROVIS URBANO MOROVIS, PR · ~20,628 served 75 9 MANATI EAST MANATI, PR · ~13,305 served 75 10 LAS BOCAS SANTURCE, PR · ~10,998 served 76 11 CIDRA URBANO CIDRA, PR · ~33,957 served 80 12 AIBONITO LA PLATA AIBONITO, PR · ~16,202 served 81 13 SALINAS URBANO SALINAS, PR · ~8,894 served 81 14 AGUAS BUENAS URBANO AGUAS BUENAS, PR · ~13,016 served 82 15 AGUADILLA AGUADILLA, PR · ~123,885 served 85 16 LAS PIEDRAS HUMACAO HUMACAO, PR · ~36,032 served 85 17 JUNCOS - CEIBA SUR JUNCOS, PR · ~36,277 served 87 18 MAUNABO URBANO MAUNABO, PR · ~9,310 served 87 19 US ARMY, FORT BUCHANAN GUAYNABO, PR · ~6,411 served 88 20 ARECIBO URBANO ARECIBO, PR · ~61,119 served 90 21 PATILLAS URBANO PATILLAS, PR · ~31,955 served 90 22 VEGA BAJA URBANO VEGA BAJA, PR · ~26,660 served 90 23 GURABO URBANO GURABO, PR · ~24,967 served 90 24 AIBONITO URBANO SANTURCE, PR · ~5,524 served 90 25 DORADO URBANO DORADO, PR · ~39,733 served 91
Highest-scoring large systems in Puerto Rico
Systems serving 10,000+ people with the best scores.
1 MAYAGUEZ MAYAGUEZ, PR · ~151,555 served 100 2 RIO BLANCO,VIEQUES,CULEDRA NAGUABO, PR · ~80,759 served 100 3 EL YUNQUE RIO GRANDE, PR · ~68,024 served 100 4 FAJARDO CEIBA FAJARDO, PR · ~58,011 served 100 5 ISABELA SANTURCE, PR · ~49,419 served 100 6 LAJAS LAJAS, PR · ~47,531 served 100 7 FARALLON CAYEY, PR · ~38,977 served 100 8 GUAYAMA URBANO GUAYAMA, PR · ~36,606 served 100
Scores reflect EPA public records (violations, enforcement, PFAS), are system-level, and can’t account for your home’s plumbing. See the methodology.