Puerto Rico tap water quality
404 community water systems serving 3.3 million people.
Data: U.S. EPA · How we read the data · How we check it
15
systems with PFAS above a federal limit
1.5 million
people served by them
96
systems EPA tested for PFAS
0
systems above the lead action level
PFAS: EPA's 2023–2025 testing. Lead: results from the last five years. 171 more systems have no recent lead results in EPA's database.
Water systems with PFAS above the federal limit
Based on EPA's UCMR 5 results (2023–2025) compared to the April 2024 limits, the way EPA compares them. Systems have until 2029 to comply. Largest first.
- PRASA Metropolitano1.1 million people · Surface water · Puerto RicoPFOS above limitAlso: Total trihalomethanes (TTHM) violations · Haloacetic acids (HAA5) violations · Coliform bacteria violations
- PRASA – Aguadilla124,782 people · Surface water · Puerto RicoPFOS above limitAlso: Haloacetic acids (HAA5) violations · Total trihalomethanes (TTHM) violations · Coliform bacteria violation
- PRASA – Ponce Urbano113,972 people · Surface water · Puerto RicoPFOS above limitAlso: PFHxS above limit · PFAS Hazard Index above limit · Total trihalomethanes (TTHM) violations
- PRASA – Santa Isabel Urbano39,925 people · Groundwater · Puerto RicoPFOS above limitAlso: PFHxS detected
- PRASA – Cidra Urbano34,424 people · Surface water · Puerto RicoPFOS above limitAlso: Total trihalomethanes (TTHM) violations · PFHxS detected
- PRASA – Patillas Urbano32,222 people · Surface water · Puerto RicoPFOS above limitAlso: Total trihalomethanes (TTHM) violations · Haloacetic acids (HAA5) violations · Coliform bacteria violation
- PRASA – Aibonito la Plata16,354 people · Surface water · Puerto RicoPFOS above limitAlso: Total trihalomethanes (TTHM) violations · PFHxS detected
- PRASA – Manati East13,580 people · Surface water · Puerto RicoPFOS above limitAlso: Total trihalomethanes (TTHM) violations · Haloacetic acids (HAA5) violation
- PRASA – Las Bocas11,022 people · Surface water · Puerto RicoPFOS above limitAlso: 22 health-based violations since 2016
- PRASA – Maunabo Urbano9,380 people · Surface water · Puerto RicoPFOS above limitAlso: Total trihalomethanes (TTHM) violations · Haloacetic acids (HAA5) violations
- PRASA – Salinas Urbano8,977 people · Groundwater · Puerto RicoPFOS above limitAlso: PFHxS detected
- PRASA – Experimental6,445 people · Groundwater · Puerto RicoPFOA above limitAlso: PFOS above limit
- PRASA – Aibonito Urbano5,580 people · Surface water · Puerto RicoPFOS above limitAlso: Total trihalomethanes (TTHM) violations
- PRASA – Aruz5,105 people · Groundwater · Puerto RicoPFOS above limit
- PRASA – Jacaguas4,261 people · Groundwater · Puerto RicoPFOS above limitAlso: PFHxS detected
Puerto Rico PFAS report: chart, rankings and data to download →
Largest water systems in Puerto Rico
- PRASA Metropolitano1.1 million people · Surface water · Puerto RicoPFOS above limitAlso: Total trihalomethanes (TTHM) violations · Haloacetic acids (HAA5) violations · Coliform bacteria violations
- PRASA – Mayaguez152,342 people · Surface water · Puerto RicoTotal trihalomethanes (TTHM) violationsAlso: Haloacetic acids (HAA5) violations
- PRASA – Aguadilla124,782 people · Surface water · Puerto RicoPFOS above limitAlso: Haloacetic acids (HAA5) violations · Total trihalomethanes (TTHM) violations · Coliform bacteria violation
- PRASA – Ponce Urbano113,972 people · Surface water · Puerto RicoPFOS above limitAlso: PFHxS above limit · PFAS Hazard Index above limit · Total trihalomethanes (TTHM) violations
- PRASA – Rio Blanco, Vieques, Culebra79,822 people · Surface water · Puerto RicoTotal trihalomethanes (TTHM) violationsAlso: Haloacetic acids (HAA5) violations
- PRASA – El Yunque68,114 people · Surface water · Puerto RicoTotal trihalomethanes (TTHM) violations
- PRASA – Arecibo Urbano61,626 people · Surface water · Puerto RicoPFOS detectedAlso: 1 health-based violation since 2016
- PRASA – Fajardo Ceiba59,044 people · Surface water · Puerto RicoNo PFAS above limits
- PRASA – Isabela49,937 people · Surface water · Puerto RicoTotal trihalomethanes (TTHM) violationsAlso: Haloacetic acids (HAA5) violations · Coliform bacteria violation
- PRASA – Caguas Norte47,352 people · Surface water · Puerto RicoPFOS detected
- PRASA – Lajas47,350 people · Surface water · Puerto RicoTotal trihalomethanes (TTHM) violations
- PRASA – Santa Isabel Urbano39,925 people · Groundwater · Puerto RicoPFOS above limitAlso: PFHxS detected
- PRASA – Farallon39,388 people · Surface water · Puerto RicoNot in EPA's PFAS sampleAlso: 6 health-based violations since 2016
- PRASA – Las Piedras Humacao38,897 people · Surface water · Puerto RicoPFOS detected
- PRASA – Dorado Urbano37,244 people · Surface water · Puerto RicoHaloacetic acids (HAA5) violationAlso: PFOS detected
Most health-based violations since 2016
- PRASA Metropolitano1.1 million people · Surface water · Puerto RicoPFOS above limitAlso: Total trihalomethanes (TTHM) violations · Haloacetic acids (HAA5) violations · Coliform bacteria violations
- PRASA – Luquillo Urbano9,001 people · Surface water · Puerto RicoNo PFAS above limitsAlso: 44 health-based violations since 2016
- PRASA – Aguadilla124,782 people · Surface water · Puerto RicoPFOS above limitAlso: Haloacetic acids (HAA5) violations · Total trihalomethanes (TTHM) violations · Coliform bacteria violation
- PRASA – Ponce Urbano113,972 people · Surface water · Puerto RicoPFOS above limitAlso: PFHxS above limit · PFAS Hazard Index above limit · Total trihalomethanes (TTHM) violations
- PRASA – Cotto Laurel12,979 people · Surface water · Puerto RicoTotal trihalomethanes (TTHM) violationsAlso: Haloacetic acids (HAA5) violations
- PRASA – Cubuy Maizales595 people · Surface water · Puerto RicoHaloacetic acids (HAA5) violations
- PRASA – Comerio Urbano14,912 people · Surface water · Puerto RicoTotal trihalomethanes (TTHM) violations
- PRASA – Las Bocas11,022 people · Surface water · Puerto RicoPFOS above limitAlso: 22 health-based violations since 2016
- PRASA – Lago Guajataca10,018 people · Surface water · Puerto RicoTotal trihalomethanes (TTHM) violationsAlso: Haloacetic acids (HAA5) violations
- PRASA – Regional Villalba Toa Vaca34,259 people · Surface water · Puerto RicoTotal trihalomethanes (TTHM) violationsAlso: Haloacetic acids (HAA5) violations
- PRASA – Orocovis Urbano16,992 people · Surface water · Puerto RicoTotal trihalomethanes (TTHM) violation
- PRASA – El Yunque68,114 people · Surface water · Puerto RicoTotal trihalomethanes (TTHM) violations
- PRASA – Sabana Grande25,832 people · Surface water · Puerto RicoTotal trihalomethanes (TTHM) violationsAlso: Haloacetic acids (HAA5) violations
- PRASA – Guayama Urbano37,076 people · Surface water · Puerto RicoHaloacetic acids (HAA5) violationsAlso: Total trihalomethanes (TTHM) violations
- PRASA – Guayabota1,036 people · Surface water · Puerto RicoNot in EPA's PFAS sampleAlso: 15 health-based violations since 2016
All Puerto Rico utilities on this site
Every Puerto Rico system serving 50,000+ people or with PFAS above a federal limit, A to Z. Download all 404 systems as CSV.
- PRASA – Aguadilla
- PRASA – Aibonito la Plata
- PRASA – Aibonito Urbano
- PRASA – Arecibo Urbano
- PRASA – Aruz
- PRASA – Cidra Urbano
- PRASA – El Yunque
- PRASA – Experimental
- PRASA – Fajardo Ceiba
- PRASA – Jacaguas
- PRASA – Las Bocas
- PRASA – Manati East
- PRASA – Maunabo Urbano
- PRASA – Mayaguez
- PRASA – Patillas Urbano
- PRASA – Ponce Urbano
- PRASA – Rio Blanco, Vieques, Culebra
- PRASA – Salinas Urbano
- PRASA – Santa Isabel Urbano
- PRASA Metropolitano
Questions
Does Puerto Rico tap water have PFAS?
EPA tested 96 community water systems in Puerto Rico for 29 PFAS between 2023 and 2025. 26 had at least one regulated PFAS detected, and 15 had an entry-point average above a 2024 federal limit. Those 15 systems serve about 1.5 million people (46% of people on community water in Puerto Rico). Systems have until 2029 to meet the limits.
How many Puerto Rico water systems have violations?
315 systems in Puerto Rico had at least one health-based violation since 2016 (1,162 violations in total). 741 violations are currently listed as unaddressed.
Which Puerto Rico water systems are over the lead action level?
0 systems had a lead 90th percentile above the 15 ppb action level in their most recent results from the last five years. Another 171 systems have no lead results in EPA's database from the last five years, including 17 whose last result was above the action level. Lead depends on each home's pipes, so a test of your own tap is the only way to know your level.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.