CoverageSuffolk County
Every area we cover in Suffolk County, NY
The measurements for all 155 areas we cover, side by side — 43 have their own page so far, and their names link to it. Groundwater depth and sewer status shape much of what can go wrong with water at a property, and both vary sharply across Suffolk County.
All measured over developed land, not whole area boundaries — why that matters · sources and known limits · verified 2026-10-18
All 155 areas
| Area | Town | Population | Water table | Wastewater | FEMA zone | In flood zone |
|---|---|---|---|---|---|---|
| Amagansett | East Hampton | 1,126 | 39 ft | Cesspool/septic | AE (100-yr floodplain) | 16.6% |
| Amityville | Babylon | 9,523 | 10 ft | Sewered | AE (100-yr floodplain) | 29.5% |
| Aquebogue | Riverhead | 2,696 | 15 ft | Cesspool/septic | AE (100-yr floodplain) | 10.0% |
| Asharoken | Huntington | 657 | 14 ft | Cesspool/septic | AE (100-yr floodplain) | 63.7% |
| Babylon | Babylon | 12,166 | 6 ft | Sewered | AE (100-yr floodplain) | 24.5% |
| Baiting Hollow | Riverhead | 1,796 | 93 ft | Cesspool/septic | VE (coastal high-velocity) | 0.7% |
| Bay Shore | Islip | 30,622 | 12 ft | Sewered | AE (100-yr floodplain) | 7.6% |
| Bayport | Islip | 8,901 | 15 ft | Cesspool/septic | AE (100-yr floodplain) | 9.0% |
| Baywood | Islip | 7,726 | 21 ft | Cesspool/septic | X (minimal) | 0.0% |
| Belle Terre | Brookhaven | 902 | 110 ft | Cesspool/septic | VE (coastal high-velocity) | 2.0% |
| Bellport | Brookhaven | 2,084 | 17 ft | Cesspool/septic | AE (100-yr floodplain) | 9.6% |
| Blue Point | Brookhaven | 4,527 | 13 ft | Cesspool/septic | AE (100-yr floodplain) | 15.4% |
| Bohemia | Islip | 9,871 | 31 ft | Cesspool/septic | AE (100-yr floodplain) | under 0.1% |
| Brentwood | Islip | 62,387 | 46 ft | Cesspool/septic | X (minimal) | 0.0% |
| Bridgehampton | Southampton | 1,756 | 36 ft | Cesspool/septic | AE (100-yr floodplain) | 8.6% |
| Brightwaters | Islip | 3,157 | 7 ft | Sewered | AE (100-yr floodplain) | 7.5% |
| Brookhaven | Brookhaven | 3,451 | 14 ft | Cesspool/septic | AE (100-yr floodplain) | 10.1% |
| Calverton | Riverhead / Brookhaven | 6,510 | 25 ft | Partial | A (approximate 100-yr floodplain) | 0.8% |
| Center Moriches | Brookhaven | 7,768 | 14 ft | Cesspool/septic | AE (100-yr floodplain) | 11.8% |
| Centereach | Brookhaven | 31,578 | 54 ft | Partial | X (minimal) | 0.0% |
| Centerport | Huntington | 5,474 | 70 ft | Cesspool/septic | VE (coastal high-velocity) | 7.1% |
| Central Islip | Islip | 34,450 | 28 ft | Partial | A (approximate 100-yr floodplain) | 0.2% |
| Cold Spring Harbor | Huntington | 5,070 | 125 ft | Cesspool/septic | AE (100-yr floodplain) | 1.8% |
| Commack | Huntington / Smithtown | 36,124 | 97 ft | Cesspool/septic | X (minimal) | 0.0% |
| Copiague | Babylon | 24,477 | 9 ft | Sewered | AE (100-yr floodplain) | 24.7% |
| Coram | Brookhaven | 39,113 | 65 ft | Partial | X (minimal) | 0.0% |
| Cutchogue | Southold | 3,349 | 27 ft | Cesspool/septic | AE (100-yr floodplain) | 9.8% |
| Deer Park | Babylon | 28,225 | 20 ft | Cesspool/septic | X (minimal) | 0.0% |
| Dix Hills | Huntington | 27,108 | 129 ft | Cesspool/septic | X (minimal) | 0.0% |
| East Farmingdale | Babylon | 6,691 | 27 ft | Partial | X (minimal) | 0.0% |
| East Hampton | East Hampton | 1,083 | 22 ft | Cesspool/septic | AE (100-yr floodplain) | 9.0% |
| East Hampton North | East Hampton | 5,377 | 46 ft | Cesspool/septic | AE (100-yr floodplain) | under 0.1% |
| East Islip | Islip | 13,694 | 9 ft | Sewered | AE (100-yr floodplain) | 4.0% |
| East Marion | Southold | 763 | 27 ft | Cesspool/septic | AE (100-yr floodplain) | 8.0% |
| East Moriches | Brookhaven | 5,547 | 24 ft | Cesspool/septic | AE (100-yr floodplain) | 10.5% |
| East Northport | Huntington | 20,217 | 153 ft | Cesspool/septic | X (minimal) | 0.0% |
| East Patchogue | Brookhaven | 22,861 | 15 ft | Partial | AE (100-yr floodplain) | 7.7% |
| East Quogue | Southampton | 5,197 | 55 ft | Cesspool/septic | AE (100-yr floodplain) | 15.9% |
| East Setauket | Brookhaven | 10,998 | 86 ft | Cesspool/septic | AE (100-yr floodplain) | 0.3% |
| East Shoreham | Brookhaven | 6,841 | 75 ft | Cesspool/septic | VE (coastal high-velocity) | 0.6% |
| Eastport | Brookhaven / Southampton | 1,762 | 27 ft | Cesspool/septic | AE (100-yr floodplain) | 3.5% |
| Eatons Neck | Huntington | 1,383 | 77 ft | Cesspool/septic | AE (100-yr floodplain) | 7.4% |
| Elwood | Huntington | 11,154 | 127 ft | Cesspool/septic | X (minimal) | 0.0% |
| Farmingville | Brookhaven | 15,482 | 104 ft | Cesspool/septic | X (minimal) | 0.0% |
| Flanders | Southampton | 5,189 | 27 ft | Cesspool/septic | AE (100-yr floodplain) | 11.9% |
| Fort Salonga | Huntington / Smithtown | 10,248 | 80 ft | Cesspool/septic | AE (100-yr floodplain) | 5.7% |
| Gilgo | Babylon | 200 | 10 ft | Cesspool/septic | AE (100-yr floodplain) | 39.9% |
| Gordon Heights | Brookhaven | 3,981 | 83 ft | Cesspool/septic | X (minimal) | 0.0% |
| Great River | Islip | 1,546 | 8 ft | Partial | AE (100-yr floodplain) | 22.3% |
| Greenlawn | Huntington | 14,071 | 137 ft | Cesspool/septic | X-shaded (500-yr) | 0.0% |
| Greenport | Southold | 2,317 | 11 ft | Sewered | AE (100-yr floodplain) | 9.6% |
| Greenport West | Southold | 1,559 | 18 ft | Cesspool/septic | AE (100-yr floodplain) | 10.4% |
| Halesite | Huntington | 2,654 | 79 ft | Partial | AE (100-yr floodplain) | 7.6% |
| Hampton Bays | Southampton | 14,633 | 49 ft | Cesspool/septic | AE (100-yr floodplain) | 11.1% |
| Hauppauge | Islip / Smithtown | 22,090 | 43 ft | Partial | X (minimal) | 0.0% |
| Head of the Harbor | Smithtown | 1,494 | 111 ft | Cesspool/septic | AE (100-yr floodplain) | 1.1% |
| Holbrook | Brookhaven / Islip | 28,091 | 51 ft | Partial | X (minimal) | 0.0% |
| Holtsville | Brookhaven | 18,708 | 53 ft | Partial | A (approximate 100-yr floodplain) | 0.7% |
| Huntington | Huntington | 19,547 | 107 ft | Partial | AE (100-yr floodplain) | 0.5% |
| Huntington Bay | Huntington | 1,454 | 49 ft | Cesspool/septic | AE (100-yr floodplain) | 11.0% |
| Huntington Station | Huntington | 33,893 | 118 ft | Cesspool/septic | X (minimal) | 0.0% |
| Islandia | Islip | 3,431 | 66 ft | Partial | X (minimal) | 0.0% |
| Islip | Islip | 18,686 | 9 ft | Sewered | AE (100-yr floodplain) | 4.4% |
| Islip Terrace | Islip | 5,635 | 10 ft | Partial | X (minimal) | 0.0% |
| Jamesport | Riverhead | 1,614 | 17 ft | Cesspool/septic | AE (100-yr floodplain) | 16.5% |
| Kings Park | Smithtown | 17,282 | 85 ft | Partial | AE (100-yr floodplain) | 1.7% |
| Lake Grove | Brookhaven | 11,163 | 46 ft | Cesspool/septic | X (minimal) | 0.0% |
| Lake Ronkonkoma | Brookhaven | 9,134 | 69 ft | Cesspool/septic | X (minimal) | 0.0% |
| Laurel | Southold / Riverhead | 1,382 | 22 ft | Cesspool/septic | AE (100-yr floodplain) | 3.9% |
| Lindenhurst | Babylon | 27,282 | 6 ft | Sewered | AE (100-yr floodplain) | 12.2% |
| Lloyd Harbor | Huntington | 3,661 | 95 ft | Cesspool/septic | VE (coastal high-velocity) | 5.7% |
| Lloyd Neck | Huntington | 754 | 103 ft | Cesspool/septic | X (minimal) | 0.0% |
| Manorville | Brookhaven / Riverhead | 14,730 | 37 ft | Cesspool/septic | A (approximate 100-yr floodplain) | 0.2% |
| Mastic | Brookhaven | 16,574 | 28 ft | Cesspool/septic | AE (100-yr floodplain) | 2.2% |
| Mastic Beach | Brookhaven | 12,790 | 10 ft | Cesspool/septic | AE (100-yr floodplain) | 30.9% |
| Mattituck | Southold | 4,198 | 22 ft | Cesspool/septic | AE (100-yr floodplain) | 12.7% |
| Medford | Brookhaven | 25,883 | 46 ft | Partial | X (minimal) | 0.0% |
| Melville | Huntington | 19,150 | 71 ft | Partial | X (minimal) | 0.0% |
| Middle Island | Brookhaven | 10,678 | 38 ft | Cesspool/septic | A (approximate 100-yr floodplain) | 0.4% |
| Miller Place | Brookhaven | 11,723 | 108 ft | Cesspool/septic | VE (coastal high-velocity) | 0.9% |
| Montauk | East Hampton | 4,334 | 48 ft | Cesspool/septic | AE (100-yr floodplain) | 10.3% |
| Moriches | Brookhaven | 3,084 | 19 ft | Cesspool/septic | AE (100-yr floodplain) | 7.7% |
| Mount Sinai | Brookhaven | 11,623 | 97 ft | Partial | AE (100-yr floodplain) | 2.8% |
| Napeague | East Hampton | 368 | 8 ft | Cesspool/septic | AE (100-yr floodplain) | 89.0% |
| Nesconset | Smithtown | 14,600 | 50 ft | Cesspool/septic | X (minimal) | 0.0% |
| New Suffolk | Southold | 343 | 18 ft | Cesspool/septic | AE (100-yr floodplain) | 24.0% |
| Nissequogue | Smithtown | 1,697 | 88 ft | Cesspool/septic | AE (100-yr floodplain) | 11.0% |
| North Amityville | Babylon | 18,482 | 14 ft | Sewered | X (minimal) | 0.0% |
| North Babylon | Babylon | 17,927 | 10 ft | Partial | A (approximate 100-yr floodplain) | 0.4% |
| North Bay Shore | Islip | 19,483 | 25 ft | Cesspool/septic | X (minimal) | 0.0% |
| North Bellport | Brookhaven | 9,989 | 33 ft | Partial | AE (100-yr floodplain) | under 0.1% |
| North Great River | Islip | 4,254 | 19 ft | Cesspool/septic | AE (100-yr floodplain) | 0.2% |
| North Haven | Southampton | 945 | 13 ft | Cesspool/septic | AE (100-yr floodplain) | 12.4% |
| North Lindenhurst | Babylon | 12,175 | 13 ft | Sewered | X (minimal) | 0.0% |
| North Patchogue | Brookhaven | 6,751 | 18 ft | Cesspool/septic | A (approximate 100-yr floodplain) | 3.6% |
| North Sea | Southampton | 4,946 | 29 ft | Cesspool/septic | AE (100-yr floodplain) | 8.8% |
| Northport | Huntington | 7,569 | 81 ft | Partial | VE (coastal high-velocity) | 3.1% |
| Northville | Riverhead | 1,043 | 51 ft | Cesspool/septic | VE (coastal high-velocity) | 2.4% |
| Northwest Harbor | East Hampton | 4,109 | 57 ft | Cesspool/septic | AE (100-yr floodplain) | 3.7% |
| Noyack | Southampton | 3,127 | 72 ft | Cesspool/septic | AE (100-yr floodplain) | 7.5% |
| Oakdale | Islip | 7,702 | 9 ft | Cesspool/septic | AE (100-yr floodplain) | 26.4% |
| Ocean Beach | Islip | 80 | 4 ft | Sewered | AE (100-yr floodplain) | 99.5% |
| Old Field | Brookhaven | 921 | 40 ft | Cesspool/septic | AE (100-yr floodplain) | 9.6% |
| Orient | Southold | 743 | 21 ft | Cesspool/septic | AE (100-yr floodplain) | 24.4% |
| Patchogue | Brookhaven | 12,260 | 10 ft | Partial | AE (100-yr floodplain) | 19.4% |
| Peconic | Southold | 1,170 | 15 ft | Cesspool/septic | AE (100-yr floodplain) | 11.2% |
| Poquott | Brookhaven | 967 | 43 ft | Cesspool/septic | VE (coastal high-velocity) | 6.7% |
| Port Jefferson | Brookhaven | 7,750 | 123 ft | Partial | AE (100-yr floodplain) | 1.8% |
| Port Jefferson Station | Brookhaven | 7,950 | 121 ft | Cesspool/septic | X (minimal) | 0.0% |
| Quiogue | Southampton | 1,013 | 14 ft | Cesspool/septic | AE (100-yr floodplain) | 20.1% |
| Quogue | Southampton | 967 | 15 ft | Cesspool/septic | AE (100-yr floodplain) | 33.8% |
| Remsenburg-Speonk | Southampton | 2,469 | 17 ft | Cesspool/septic | AE (100-yr floodplain) | 14.7% |
| Ridge | Brookhaven | 13,507 | 42 ft | Partial | A (approximate 100-yr floodplain) | 0.5% |
| Riverhead | Riverhead | 14,993 | 30 ft | Partial | AE (100-yr floodplain) | 2.3% |
| Riverside | Southampton | 2,917 | 9 ft | Cesspool/septic | AE (100-yr floodplain) | 7.6% |
| Rocky Point | Brookhaven | 13,633 | 96 ft | Cesspool/septic | VE (coastal high-velocity) | under 0.1% |
| Ronkonkoma | Islip / Brookhaven | 18,955 | 37 ft | Cesspool/septic | X (minimal) | under 0.1% |
| Sag Harbor | Southampton / East Hampton | 2,746 | 26 ft | Sewered | AE (100-yr floodplain) | 15.4% |
| Sagaponack | Southampton | 313 | 26 ft | Cesspool/septic | AE (100-yr floodplain) | 10.8% |
| Saint James | Smithtown | 13,487 | 82 ft | Cesspool/septic | X (minimal) | 0.0% |
| Saltaire | Islip | 40 | 5 ft | Cesspool/septic | AE (100-yr floodplain) | 100.0% |
| San Remo | Smithtown | 6,905 | 92 ft | Partial | AE (100-yr floodplain) | 11.3% |
| Sayville | Islip | 16,569 | 16 ft | Cesspool/septic | AE (100-yr floodplain) | 5.3% |
| Selden | Brookhaven | 21,262 | 45 ft | Partial | X (minimal) | 0.0% |
| Setauket | Brookhaven | 3,986 | 51 ft | Cesspool/septic | AE (100-yr floodplain) | 3.6% |
| Shelter Island | Shelter Island | 2,475 | 29 ft | Cesspool/septic | AE (100-yr floodplain) | 6.2% |
| Shelter Island Heights | Shelter Island | 1,147 | 31 ft | Cesspool/septic | AE (100-yr floodplain) | 11.6% |
| Shinnecock Hills | Southampton | 1,808 | 42 ft | Cesspool/septic | AE (100-yr floodplain) | 9.6% |
| Shirley | Brookhaven | 28,085 | 35 ft | Cesspool/septic | AE (100-yr floodplain) | 4.8% |
| Shoreham | Brookhaven | 463 | 82 ft | Cesspool/septic | VE (coastal high-velocity) | 1.5% |
| Smithtown | Smithtown | 27,531 | 49 ft | Cesspool/septic | AE (100-yr floodplain) | 0.8% |
| Sound Beach | Brookhaven | 7,416 | 127 ft | Cesspool/septic | VE (coastal high-velocity) | 0.3% |
| South Huntington | Huntington | 9,422 | 117 ft | Cesspool/septic | X (minimal) | 0.0% |
| South Jamesport | Riverhead | 1,135 | 12 ft | Cesspool/septic | AE (100-yr floodplain) | 50.0% |
| Southampton | Southampton | 3,109 | 12 ft | Cesspool/septic | AE (100-yr floodplain) | 14.5% |
| Southold | Southold | 5,747 | 15 ft | Cesspool/septic | AE (100-yr floodplain) | 16.4% |
| Springs | East Hampton | 6,592 | 25 ft | Cesspool/septic | AE (100-yr floodplain) | 6.4% |
| Stony Brook | Brookhaven | 13,467 | 68 ft | Partial | AE (100-yr floodplain) | 1.6% |
| Terryville | Brookhaven | 11,472 | 96 ft | Cesspool/septic | X (minimal) | 0.0% |
| Tuckahoe | Southampton | 1,818 | 39 ft | Cesspool/septic | AE (100-yr floodplain) | 8.0% |
| Village of the Branch | Smithtown | 1,900 | 16 ft | Cesspool/septic | AE (100-yr floodplain) | 4.6% |
| Wading River | Brookhaven / Riverhead | 7,731 | 85 ft | Cesspool/septic | VE (coastal high-velocity) | 1.3% |
| Wainscott | East Hampton | 658 | 34 ft | Cesspool/septic | AE (100-yr floodplain) | 3.4% |
| Water Mill | Southampton | 1,859 | 37 ft | Cesspool/septic | AE (100-yr floodplain) | 12.8% |
| West Babylon | Babylon | 43,213 | 12 ft | Sewered | AE (100-yr floodplain) | 6.2% |
| West Bay Shore | Islip | 4,506 | 8 ft | Sewered | AE (100-yr floodplain) | 3.8% |
| West Hampton Dunes | Southampton | 55 | 8 ft | Cesspool/septic | AE (100-yr floodplain) | 99.7% |
| West Hills | Huntington | 5,523 | 150 ft | Cesspool/septic | X (minimal) | 0.0% |
| West Islip | Islip | 27,950 | 8 ft | Sewered | AE (100-yr floodplain) | 6.9% |
| West Sayville | Islip | 4,872 | 13 ft | Cesspool/septic | AE (100-yr floodplain) | 16.7% |
| Westhampton | Southampton | 3,068 | 29 ft | Partial | AE (100-yr floodplain) | 10.2% |
| Westhampton Beach | Southampton | 2,148 | 12 ft | Cesspool/septic | AE (100-yr floodplain) | 42.3% |
| Wheatley Heights | Babylon | 5,140 | 29 ft | Cesspool/septic | X (minimal) | 0.0% |
| Wyandanch | Babylon | 12,990 | 14 ft | Partial | X (minimal) | 0.0% |
| Yaphank | Brookhaven | 5,974 | 45 ft | Cesspool/septic | A (approximate 100-yr floodplain) | 0.5% |
"In flood zone" is the share of developed land inside a FEMA Special Flood Hazard Area; "under 0.1%" is a sliver that rounds to zero. FEMA zone is the zone found on the area's developed land, however little of it. Water table is an average across sampled points in the developed part of each area, not a reading at any one address.
Places in Suffolk County we do not cover
6 places in the county are deliberately outside our coverage: they have no row in the table above and no measurements on this site. Listed because a coverage claim means more when the exclusions are stated:
- Stony Brook University (university campus) — no owner-occupied homes
- Captree (hamlet, 48 residents) — mostly marina and state parkland
- Dering Harbor (village, 13 residents) — one of the smallest villages in New York State
- Fire Island (hamlet, 777 residents) — seasonal barrier-island communities, most of them reached by ferry
- Northampton (hamlet, 763 residents) — a small census place we have not measured
- Fishers Island (hamlet, 236 residents) — reached by ferry from New London, Connecticut
If you are in one of these and have a water emergency, you can still call (631) 440-4144. Whether a specialist covers your address depends on where it is, so say where you are when you call.