Puerto Rico tap water
15 of 96 Puerto Rico water systems with full PFAS testing (16%) averaged above a 2024 federal PFAS level at one or more sampling points.
- 404 active community water systems in the EPA file; 89 serve 3,300+ people and have a full PFAS set.
- 266 systems had at least one health-based violation since 2021-10-26.
- 17 systems report a lead 90th percentile above 15 ppb (some results are old; check each system page).
Largest systems
| System | People served | PFAS above a 2024 level? | Health-based violations since 2021-10-26 |
|---|---|---|---|
| Metropolitano | 1,084,637 | Yes, at one or more sampling points | 39 |
| Mayaguez | 152,342 | No | 1 |
| Aguadilla | 124,782 | Yes, at one or more sampling points | 1 |
| Ponce Urbano | 113,972 | Yes, at one or more sampling points | 11 |
| Rio Blanco,vieques,culedra | 79,822 | No | 0 |
| El Yunque | 68,114 | No | 10 |
| Arecibo Urbano | 61,626 | No | 1 |
| Fajardo Ceiba | 59,044 | No | 0 |
All 11 utilities with a page in Puerto Rico
- Aguadilla 124,782
- Arecibo Urbano 61,626
- Caguas Norte 47,352
- El Yunque 68,114
- Fajardo Ceiba 59,044
- Isabela 49,937
- Lajas 47,350
- Mayaguez 152,342
- Metropolitano 1,084,637
- Ponce Urbano 113,972
- Rio Blanco,vieques,culedra 79,822
Why not "the state's water quality"? You drink from one utility, not a state. Rollups count systems, not people, so one large utility counts the same as a small one. Use the system pages for your actual water.
Not medical or legal advice. UCMR 5 results are screening data, not compliance determinations.
Sources and freshness
Public-water-system facts, violations and lead/copper results: EPA ECHO SDWA download (SDWIS snapshot 2026-10-13). PFAS and lithium results: EPA UCMR 5 final data (sampling 2023–2025). Both are U.S. government works, downloaded 2026-10-26. Numbers are computed by the published method; the same fields are in the open data files.