We found 20 public water systems that could serve the same population as Sierrita (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Regional Villalba Toa Vaca | Villalba | 45,080 | 29 | 87 |
| Aceitunas | Villalba | 11,095 | 0 | 125 |
| Villalba Urbano | Ponce, Villalba | 3,698 | 20 | 99 |
| La Sierrita | Villalba | 2,039 | 0 | 0 |
| Julita | Ponce, Villalba | 1,111 | 0 | 0 |
| Cespedes | Ponce, Villalba | 598 | 0 | 0 |
| Apeadero | Ponce, Villalba | 533 | 0 | 57 |
| Vacas Iii | Villalba | 500 | 0 | 119 |
| Vacas Ii | Villalba | 500 | 0 | 382 |
| Dajaos | Villalba | 488 | 0 | 9 |
| Vista Alegre | Villalba | 340 | 0 | 254 |
| Villa Blanca | Villalba | 306 | 0 | 365 |
| Aceituna Ii | Villalba | 132 | 0 | 388 |
| La Julita | Villalba | 108 | 0 | 0 |
| Sierrita-caonilla | Villalba | 100 | 0 | 0 |
| Las Trozas | Villalba | 70 | 0 | 0 |
| Aceituna I | Villalba | 69 | 0 | 0 |
| Lajitas | Villalba | 40 | 0 | 0 |
| Aceituna Iii | Villalba | 36 | 0 | 0 |
| Semil I | Villalba | 30 | 0 | 0 |