We found 17 public water systems that could serve the same population as Porter Master Improvement Area (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Porter Sud | Porter | 15,892 | 37 | 8 |
| Porter Master Improvement Area | Porter, Youngstown | 6,920 | 0 | 0 |
| YOUNGSTOWN (V) | Youngstown | 2,021 | 0 | 0 |
| Maine Water Company Kezar Falls Division | Hiram, Parsonsfield, Porter | 993 | 0 | 3 |
| Discovery Charter School | Porter | 454 | 0 | 1 |
| Ossipee River Campground | Porter | 375 | 0 | 0 |
| Maine Teen Camp | Porter | 350 | 0 | 0 |
| Porter | Porter | 180 | 0 | 8 |
| Leroys Hot Stuff | Porter | 110 | 0 | 0 |
| Family Express - Distribution Center | Porter | 102 | 0 | 0 |
| In Dunes Natl Lakeshore-bldg105 | Porter | 75 | 0 | 0 |
| In Dunes Natl Lakeshore-bailly Comfort | Porter | 68 | 0 | 0 |
| Camp Goodfellow - Building 215 | Porter | 43 | 0 | 0 |
| Trailer Transit, Inc. | Porter | 34 | 0 | 0 |
| Porters Corner Store | Porter | 25 | 0 | 0 |
| Indiana Dunes Natnl Lakeshore | Porter | 25 | 0 | 0 |
| In Dunes Natl Lakeshore-horse Trail-407 | Porter | 25 | 0 | 0 |