We found 53 public water systems that could serve the same population as Maruenos (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Ponce Urbano | Penuelas, Ponce | 153,092 | 255 | 546 |
| Cotto Laurel | Ponce | 14,365 | 20 | 223 |
| Guayanilla Urbano | Guayanilla, Ponce | 9,597 | 38 | 132 |
| Cerrillos | Ponce | 8,203 | 0 | 65 |
| U.c.p.r | Ponce | 7,416 | 0 | 196 |
| Real Anon | Ponce | 3,623 | 26 | 21 |
| Real Anon | Ponce | 3,174 | 0 | 0 |
| Ollas | Ponce, Santa Isabel | 2,095 | 0 | 0 |
| Villa Paraiso | Ponce | 1,719 | 0 | 0 |
| Guaraguao | Ponce | 1,680 | 0 | 61 |
| Ranchera | Rancheras, Yauco | 1,560 | 0 | 56 |
| Hospital De Damas | Ponce | 1,306 | 0 | 213 |
| Qda Limon | Qda Limon | 1,100 | 0 | 0 |
| Ussc Puerto Rico, Inc | Ponce | 1,100 | 0 | 0 |
| La Yuca | Ponce | 927 | 0 | 0 |
| Anon Carmelita | Ponce | 800 | 0 | 353 |
| Corral Viejo | Corral Viejo | 680 | 0 | 0 |
| Asoc. Civica Pastillo Tibes | Ponce | 652 | 0 | 104 |
| Hogares Seguros | Ponce | 544 | 0 | 0 |
| Asociacion Civica Cultural Y Socioeconom | Ponce | 500 | 0 | 394 |
| La Yuca | Ponce | 500 | 0 | 0 |
| Collado | Ponce | 482 | 0 | 0 |
| Caminos Del Sur | Ponce | 423 | 0 | 0 |
| Tibes | Ponce | 418 | 0 | 42 |
| Iglesia Cristiana De La Familia | Ponce | 400 | 0 | 0 |
| Escuela Industrial De Ninas | Ponce | 350 | 0 | 0 |
| Hogares Seguros | Ponce | 330 | 0 | 39 |
| Academia Ramos Morales | Ponce | 323 | 0 | 12 |
| Acd. Comunal Rio Chiquito | Ponce | 320 | 0 | 25 |
| Tibes | Ponce | 319 | 0 | 0 |
| Bo. Monte Llanos | Ponce | 316 | 0 | 119 |
| Servicio De Agua | Ponce | 310 | 0 | 370 |
| Estancias Del Madrigal | Ponce | 258 | 0 | 6 |
| Essilor Industries | Ponce | 250 | 0 | 0 |
| La Mocha | Ponce | 206 | 0 | 37 |
| Ponce Darlington Elderly | Ponce | 183 | 0 | 93 |
| El Tesoro | Ponce | 135 | 0 | 265 |
| Rovira Biscuit Co | County of Ponce Municipio | 125 | 0 | 0 |
| Las Mesas | Ponce | 120 | 0 | 0 |
| P.r.iron Works | County of Ponce Municipio | 100 | 0 | 0 |
| El Yumuri | Ponce | 80 | 0 | 0 |
| Acueducto Familia Torres | Ponce | 80 | 0 | 0 |
| Condominio Irizarry | County of Ponce Municipio | 75 | 0 | 0 |
| Buena Vista Dairy | County of Ponce Municipio | 60 | 0 | 0 |
| Comunidad Cesario | Ponce | 52 | 0 | 0 |
| Terrazos Pico, Inc | County of Ponce Municipio | 50 | 0 | 0 |
| Hacienda Burenes | Ponce | 50 | 0 | 0 |
| Borinquen Asbestos Cenment | County of Ponce Municipio | 45 | 0 | 0 |
| Hogares Seguros | Ponce | 40 | 0 | 0 |
| Los Crotos | Ponce | 38 | 0 | 0 |
| La Carmelita | Ponce | 38 | 0 | 0 |
| Ebanisteria Rodriguez | County of Ponce Municipio | 30 | 0 | 0 |
| Alto De Penuelas | Alto De Penuela | 0 | 0 | 0 |