We found 15 public water systems that could serve the same population as Swan Cove Water Supply (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Jericho Wd | Oyster Bay | 58,000 | 217 | 95 |
| Hicksville Wd | Oyster Bay | 47,810 | 111 | 1 |
| South Farmingdale Wd | Oyster Bay | 44,700 | 57 | 0 |
| Massapequa Wd | Massapequa Park, Oyster Bay | 43,000 | 50 | 84 |
| Plainview Wd | Oyster Bay | 35,000 | 66 | 28 |
| Bethpage Wd | Oyster Bay | 33,000 | 47 | 1 |
| Oyster Bay Wd | Oyster Bay | 8,700 | 0 | 2 |
| Locust Valley Wd | Mill Neck, Oyster Bay | 7,500 | 58 | 2 |
| Tobay Beach | Oyster Bay | 2,420 | 0 | 21 |
| Glenwood Wd | Oyster Bay | 1,000 | 0 | 1 |
| Sagamore Hill National Site | Oyster Bay | 362 | 0 | 0 |
| New York American Water - Mill Neck | Mill Neck, Oyster Bay | 240 | 0 | 4 |
| Seawanhaka Yacht Club | Centre Island, Oyster Bay | 60 | 0 | 0 |
| Beaver Dam Winter Sports | Matinecock, Oyster Bay | 35 | 0 | 0 |
| Split Rock Water Supply | Centre Island, Oyster Bay | 15 | 0 | 0 |