| 2019 Puerto Rico Water System Provider | Chlorine [ppm] | Copper [ppm] | Lead [ppm] | TTHM [ppb] | HAA [ppb] | TOC [TT] |
| Hatillo-Camuy | 1.47 | 0.05 | 3.0 | 52.0 | 31.0 | 1.00 |
| Quebradillas Urbano | 1.37 | 1.81 | 4.3 | 55.0 | 32.0 | 0.97 |
| Morovis Urbano | 1.42 | 0.30 | 3.0 | 63.0 | 46.0 | 1.97 |
| Florida Urbano | 1.52 | 1.18 | 3.0 | 53.0 | 37.0 | *** |
| Arecibo Urbano | 1.36 | 0.19 | 4.0 | 80.0 | 60.0 | 1.32 |
| Barceloneta Urbano | 1.14 | 0.24 | 3.0 | 60.0 | 35.0 | *** |
| Utuado Urbano | 1.79 | 0.13 | 3.0 | 37.0 | 29.0 | 1.00 |
| Jayuya Urbano | 1.56 | 0.21 | 3.0 | 87.0 | 78.0 | 0.84 |
| Vega Baja Urbano | 1.25 | 1.42 | 3.0 | 61.0 | 39.0 | *** |
| Mayaguez Urbano | 1.43 | 0.10 | 3.0 | 77.0 | 44.0 | 1.13 |
| Isabela Urbano | 1.36 | 0.56 | 3.1 | 66.0 | 45.0 | 1.15 |
| Sabana Grande Urbano | 1.34 | 0.09 | 3.0 | 92.0 | 58.0 | 1.04 |