| 2018 Puerto Rico Water System Provider | Chlorine [ppm] | Copper [ppm] | Lead [ppm] | TTHM [ppb] | HAA [ppb] | TOC [TT] |
| Hatillo-Camuy | 1.86 | 0.60 | 3.0 | 44.0 | 29.0 | 1.14 |
| Quebradillas Urbano | 1.30 | 1.81 | 4.3 | 48.0 | 31.0 | 1.13 |
| Morovis Urbano | 1.36 | 0.20 | 6.0 | 56.0 | 39.0 | 2.09 |
| Florida Urbano | 1.52 | 1.18 | 3.0 | 53.0 | 37.0 | *** |
| Arecibo Urbano | 1.51 | 0.18 | 3.0 | 59.0 | 32.0 | 1.38 |
| Barceloneta Urbano | 1.06 | 0.24 | 3.0 | 59.0 | 50.0 | 0.00 |
| Utuado Urbano | 1.73 | 0.13 | 3.0 | 63.0 | 44.0 | 1.00 |
| Jayuya Urbano | 1.67 | 0.21 | 3.0 | 65.0 | 86.0 | 0.96 |
| Vega Baja Urbano | 1.88 | 0.14 | 3.0 | 71.0 | 42.0 | 1.09 |
| Mayaguez Urbano | 1.58 | 0.10 | 3.0 | 86.0 | 75.0 | 1.00 |
| Isabela Urbano | 1.52 | 0.56 | 3.1 | 93.0 | 63.0 | 1.09 |
| Sabana Grande Urbano | 1.78 | 0.09 | 3.0 | 104.0 | 63.0 | 1.17 |