Suffolk County, New York
140 active water systems in this county.
| Water System | Population Served | Source | Violations | Health-Based |
|---|---|---|---|---|
| Camp Quinipet | 150 | Groundwater | 15 | 10 |
| Fishers Island Water Works | 300 | Surface Water | 81 | 8 |
| East Hampton Point | 100 | Groundwater | 8 | 7 |
| Captree State Park | 4,100 | Groundwater | 8 | 6 |
| Shelter Island Slice | 60 | Groundwater | 11 | 5 |
| Ellis Country Market | 50 | Groundwater | 8 | 4 |
| Dering Harbor Water District | 14 | Groundwater | 6 | 4 |
| Montauk Lighthouse Reception Center | 100 | Groundwater | 4 | 4 |
| Ocean Beach Water District | 4,500 | Groundwater | 83 | 3 |
| Old Stove Pub | 150 | Groundwater | 13 | 3 |
| Suffolk County Water Authority | 1,100,000 | Groundwater | 12 | 3 |
| Riverhead Water District | 35,000 | Groundwater | 9 | 3 |
| Swans Marina | 200 | Groundwater | 8 | 3 |
| Pellegrini Vineyard | 50 | Groundwater | 8 | 3 |
| Exxon (fna Hess Mart Calverton) | 100 | Groundwater | 5 | 3 |
| Peconic River Mobile Home Park | 75 | Groundwater | 5 | 3 |
| Plum Island Animal Disease Lab | 130 | Groundwater | 3 | 3 |
| Oysterpond Elementary School | 106 | Groundwater | 3 | 3 |
| Calverton Hills Owners Association | 897 | Groundwater | 123 | 2 |
| Moonflower | 50 | Groundwater | 6 | 2 |
| Robert Moses State Park | 11,600 | Groundwater | 5 | 2 |
| Orient Beach State Park | 800 | Groundwater | 5 | 2 |
| Shelter Island School | 315 | Groundwater | 5 | 2 |
| Oldcastle Infrastructure | 40 | Groundwater | 5 | 2 |
| West Neck Water District | 100 | Groundwater | 4 | 2 |
| Coecles Harbor Marina | 150 | Groundwater | 3 | 2 |
| Rita Cantina | 70 | Groundwater | 3 | 2 |
| Lenz Winery | 50 | Groundwater | 3 | 2 |
| Cross Sound Ferry | 100 | Groundwater | 2 | 2 |
| Orient Yacht Club | 50 | Groundwater | 2 | 2 |
| Shelter Island Town Hall | 50 | Groundwater | 2 | 2 |
| Wolffer Estates Stables | 45 | Groundwater | 2 | 2 |
| 555 Professional Bldg. | 30 | Groundwater | 2 | 2 |
| Marias Kitchen | 25 | Groundwater | 2 | 2 |
| Maidstone Park Cottages | 34 | Groundwater | 123 | 1 |
| Shelter Island Heights Association | 463 | Groundwater | 119 | 1 |
| Peconic View Mobile Home Park | 40 | Groundwater | 114 | 1 |
| Saltaire Water District | 2,000 | Groundwater | 8 | 1 |
| Fort Pond House | 50 | Groundwater | 3 | 1 |
| Camp Blue Bay | 200 | Groundwater | 2 | 1 |
| Orient Country Store | 100 | Groundwater | 2 | 1 |
| Gardiners Bay Country Club | 100 | Groundwater | 2 | 1 |
| Perlman Music School | 80 | Groundwater | 2 | 1 |
| Pugliese Vineyards | 50 | Groundwater | 2 | 1 |
| Valero | 1,000 | Groundwater | 1 | 1 |
| Dering Harbor Corp | 250 | Groundwater | 1 | 1 |
| Long Island Game Farm | 200 | Groundwater | 1 | 1 |
| Joes Kwik Mart | 200 | Groundwater | 1 | 1 |
| First Student-middle Island(was Laidlaw) | 125 | Groundwater | 1 | 1 |
| Bp Gas & Foodmart | 100 | Groundwater | 1 | 1 |
| Ymca Brookhaven Roe | 100 | Groundwater | 1 | 1 |
| Montauket Hotel | 100 | Groundwater | 1 | 1 |
| Jefferson Temple Church of God in Christ | 100 | Groundwater | 1 | 1 |
| Shelter Island Nutrition Program | 75 | Groundwater | 1 | 1 |
| Bp Gas-ridge | 75 | Groundwater | 1 | 1 |
| Corey Creek Vineyards | 75 | Groundwater | 1 | 1 |
| South Harbor Park | 50 | Groundwater | 1 | 1 |
| Borghese Vineyard | 50 | Groundwater | 1 | 1 |
| Wolffer Estate Vineyard | 50 | Groundwater | 1 | 1 |
| Eccentric Bagel | 50 | Groundwater | 1 | 1 |
| Ighl, East Moriches | 50 | Groundwater | 1 | 1 |
| Coastal Pipeline Corp. | 30 | Groundwater | 1 | 1 |
| Northport Va Hospital | 3,088 | Groundwater | 296 | 0 |
| Greenlawn Water District | 42,000 | Groundwater | 95 | 0 |
| Dix Hills Water District | 34,522 | Groundwater | 89 | 0 |
| Hampton Bays Water District | 12,500 | Groundwater | 40 | 0 |
| Seaview Water Company | 1,400 | Groundwater | 6 | 0 |
| Oak Beach Public Water Supply | 66 | Groundwater | 6 | 0 |
| 1983 Montauk Hwy Offices Coparts | 190 | Groundwater | 5 | 0 |
| Mattituck Fishing Station | 40 | Groundwater | 5 | 0 |
| Greenport Water District | 2,050 | Groundwater Purchased | 4 | 0 |
| South Huntington Water District | 81,760 | Groundwater | 3 | 0 |
| West Gilgo Beach Association | 300 | Groundwater | 3 | 0 |
| Great Gun Beach | 100 | Groundwater | 3 | 0 |
| Brookhaven National Laboratory | 3,500 | Groundwater | 2 | 0 |
| American Legion Post #281 | 100 | Groundwater | 2 | 0 |
| Buckskill Tennis Club | 60 | Groundwater | 2 | 0 |
| Eastport Animal Hospital | 50 | Groundwater | 2 | 0 |
| Cedar Beach Sportfishing Educ. Center | 200 | Groundwater | 1 | 0 |
| Caribbean Spot | 200 | Groundwater | 1 | 0 |
| Rock Hill Country Club | 150 | Groundwater | 1 | 0 |
| Kyles (previously Cafe 27) | 150 | Groundwater | 1 | 0 |
| Kings Park Launch Ramp | 100 | Groundwater | 1 | 0 |
| Bp Mart Peconic | 100 | Groundwater | 1 | 0 |
| Island Boatyard & Marina | 100 | Groundwater | 1 | 0 |
| Islander(pat & Steves Family Restaurant | 75 | Groundwater | 1 | 0 |
| Rams Head Inn | 50 | Groundwater | 1 | 0 |
| All Seasons Catering | 50 | Groundwater | 1 | 0 |
| Commander Cody Seafood | 50 | Groundwater | 1 | 0 |
| Varneys Restaurant | 48 | Groundwater | 1 | 0 |
| Barcelona Bungalows | 36 | Groundwater | 1 | 0 |
| Smithtown Water District | 19,635 | Groundwater Purchased | 0 | 0 |
| St James Water District | 10,587 | Groundwater Purchased | 0 | 0 |
| Riverside Water District | 2,050 | Groundwater Purchased | 0 | 0 |
| Gilgo Beach | 500 | Groundwater | 0 | 0 |
| Cedar Beach (golf Course/concession) | 500 | Groundwater | 0 | 0 |
| Overlook Beach | 450 | Groundwater | 0 | 0 |
| Atlantic Bluffs Club | 200 | Groundwater | 0 | 0 |
| Sag Harbor State Golf Course | 200 | Groundwater | 0 | 0 |
| Speedway #7794 (fna Hess General Store) | 200 | Groundwater | 0 | 0 |
| D. S. Shanahans | 150 | Groundwater | 0 | 0 |
| Townline Bbq | 150 | Groundwater | 0 | 0 |
| Hampton Hills Golf Club | 150 | Groundwater | 0 | 0 |
| La Antigua | 150 | Groundwater | 0 | 0 |
| Whales Tale | 150 | Groundwater | 0 | 0 |
| Old Stone Market | 125 | Groundwater | 0 | 0 |
| Sandy Hollow Day Camp | 120 | Groundwater | 0 | 0 |
| Maidstone Park Beach/ballfield | 100 | Groundwater | 0 | 0 |
| Montauk State Park | 100 | Groundwater | 0 | 0 |
| Pridwin Hotel | 100 | Groundwater | 0 | 0 |
| Mill Creek Marina | 100 | Groundwater | 0 | 0 |
| Surfside Inn | 100 | Groundwater | 0 | 0 |
| La Capannina | 100 | Groundwater | 0 | 0 |
| Fresh Pond Road Park & Beach | 100 | Groundwater | 0 | 0 |
| Orient by the Sea | 100 | Groundwater | 0 | 0 |
| Silly Lilly Fishing Station | 100 | Groundwater | 0 | 0 |
| Maidstone Gun Club | 100 | Groundwater | 0 | 0 |
| Shelter Island Iga Market | 100 | Groundwater | 0 | 0 |
| Atlantic Golf Club | 100 | Groundwater | 0 | 0 |
| Maidstone Market | 100 | Groundwater | 0 | 0 |
| Ev and Em Vineyard | 100 | Groundwater | 0 | 0 |
| Maidstone Harbor Marina | 100 | Groundwater | 0 | 0 |
| Vine Street Cafe | 80 | Groundwater | 0 | 0 |
| Alberts Landing | 75 | Groundwater | 0 | 0 |
| Wades Beach | 75 | Groundwater | 0 | 0 |
| Bridge Street Water | 75 | Groundwater | 0 | 0 |
| Cards Cottages | 60 | Groundwater | 0 | 0 |
| South Lake Drive Park | 50 | Groundwater | 0 | 0 |
| Bellport Village Beach | 50 | Groundwater | 0 | 0 |
| Sea Haven Resort Motel (fna Sun+sand) | 50 | Groundwater | 0 | 0 |
| North Shore Office Building | 50 | Groundwater | 0 | 0 |
| Opties and Dinghies | 50 | Groundwater | 0 | 0 |
| Mashomack Pres. Visitor Ctr. | 50 | Groundwater | 0 | 0 |
| Long House Reserve | 50 | Groundwater | 0 | 0 |
| Amagansett Laundry | 50 | Groundwater | 0 | 0 |
| Mccall Farm Winery | 40 | Groundwater | 0 | 0 |
| Outrigger Coop | 36 | Groundwater | 0 | 0 |
| Shelter Island Senior Citizens Center | 35 | Groundwater | 0 | 0 |
| Gotham Tennis | 30 | Groundwater | 0 | 0 |
| Seascape Motel | 25 | Groundwater | 0 | 0 |