We found 26 public water systems that could serve the same population as Old Dock Inn (ordered by population size).
| Name | Areas served | Population served | Contaminant count | Violation count |
|---|---|---|---|---|
| Suffolk County Water Authority | Babylon, Brookhaven, East Hampton, Huntington, Islip, Riverhead, Smithtown, Southampton, Southold | 1,100,000 | 3,457 | 9 |
| Smithtown Wd | Smithtown | 19,635 | 16 | 2 |
| St James Wd | Smithtown | 10,587 | 22 | 3 |
| Sunken Meadow State Park | Smithtown | 500 | 0 | 0 |
| Long Beach | Smithtown | 300 | 0 | 0 |
| Ground Round Restaurant | Smithtown | 300 | 0 | 0 |
| Spofera Park | Smithtown | 300 | 0 | 0 |
| Mcdonalds Restaurant (smithtown) | Smithtown | 250 | 0 | 0 |
| Knox School | Smithtown | 210 | 0 | 0 |
| The Habitat | Smithtown | 200 | 0 | 0 |
| Wesleyan Pre-school | Smithtown | 200 | 0 | 0 |
| Towne House Motor Inn | Smithtown | 200 | 0 | 0 |
| Blackbeards Restaurant | Smithtown | 200 | 0 | 0 |
| Nissequogue Golf Club | Smithtown | 150 | 0 | 0 |
| Cafe Havana (previously Anna Marias) | Smithtown | 150 | 0 | 0 |
| D. S. Shanahans | Smithtown | 150 | 0 | 2 |
| Sophies Restaurant & Catering | Smithtown | 150 | 0 | 0 |
| Short Beach | Smithtown | 100 | 0 | 0 |
| Reichman, Brown & Kaplan Off. | Smithtown | 100 | 0 | 0 |
| Kings Park Launch Ramp | Smithtown | 100 | 0 | 0 |
| Nissequogue Yacht Club | Smithtown | 90 | 0 | 0 |
| Menorah Day School | Smithtown | 55 | 0 | 0 |
| Sunken Meadow Canoe & Kayak | Smithtown | 50 | 0 | 0 |
| Landmark Professional Bldg. | Smithtown | 40 | 0 | 0 |
| Nissequogue Point Beach | Smithtown | 30 | 0 | 0 |
| 649 & 647 Commack Road Offices | Smithtown | 0 | 0 | 0 |