Jefferson County, New York — public water systems
At a glance
157 active public water systems are filed under Jefferson County, New York in EPA's SDWIS records, together reporting 130,600 people served. The largest is Fort Drum, which reports serving 34,000 people. 57 are community water systems serving people where they live; the other 100 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
157
Population served
130.6K
Community systems
57
Groundwater share
66.9%
How does Jefferson County compare with other New York counties?
Jefferson County has the 17th-most active public water systems among the 100 counties listed for active New York systems in EPA records; among the 64 with 3 or more systems, the median has 94. Its systems report 130,600 people served in total, the 21st-largest county figure in the state and 0.7% of the statewide total. The average system here reports serving 832 people, about 65% below the New York average of 2,374. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.
Where does Jefferson County's drinking water come from?
By primary water source, Jefferson County's active systems draw on groundwater (90, 57%), surface water (30, 19%), purchased surface water (22, 14%) and groundwater under influence of surface water (8, 5.1%). Overall, 67% rely mainly on groundwater (including purchased groundwater) and 33% on surface water, compared with 91% and 8.5% across New York. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, Fort Drum, draws primarily on purchased surface water.
What kinds of water systems operate in Jefferson County?
Jefferson County's active systems break down as 57 community systems (36%), 4 non-transient non-community systems (2.5%) and 96 transient non-community systems (61%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as private (59%), local government (29%), state government (7%) and public/private partnership (2.5%).
The 50 largest water systems in Jefferson County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Fort Drum | Jefferson | 34,000 | Community | Purchased surface water |
| 2 | Watertown City | Jefferson | 27,861 | Community | Surface water |
| 3 | Leray Town Wd 1, 2, 4 | Jefferson | 7,140 | Community | Groundwater |
| 4 | Carthage Village | Jefferson | 3,600 | Community | Surface water |
| 5 | Cape Vincent Town Wd 1 & 5 | Jefferson | 2,600 | Community | Purchased surface water |
| 6 | Sackets Harbor Village | Jefferson | 2,200 | Community | Surface water |
| 7 | Clayton Village | Jefferson | 2,100 | Community | Surface water |
| 8 | Can-Am Speedway | Jefferson | 2,000 | Transient non-community | Groundwater |
| 9 | Adams Village | Jefferson | 2,000 | Community | Groundwater |
| 10 | Alexandria Bay Village | Jefferson | 1,900 | Community | Surface water |
| 11 | Pamelia Town Wd 4 & 5 | Jefferson | 1,857 | Community | Purchased surface water |
| 12 | Philadelphia Village | Jefferson | 1,800 | Community | Groundwater under influence of surface water |
| 13 | West Carthage Village | Jefferson | 1,734 | Community | Purchased surface water |
| 14 | Black River Village | Jefferson | 1,600 | Community | Groundwater |
| 15 | Stone Mills Museum | Jefferson | 1,500 | Transient non-community | Groundwater |
| 16 | Cape Vincent Village | Jefferson | 1,500 | Community | Surface water |
| 17 | Rutland Town Wd 1 | Jefferson | 1,500 | Community | Purchased groundwater |
| 18 | Ellisburg Wd 1, 2 & 3 | Jefferson | 1,500 | Community | Groundwater |
| 19 | Brownville Village | Jefferson | 1,200 | Community | Groundwater |
| 20 | Dexter Village | Jefferson | 1,100 | Community | Groundwater |
| 21 | Adams T Wd 1,2,3 (Adams Center) | Jefferson | 1,000 | Community | Purchased groundwater |
| 22 | Wellesley Island State Park | Jefferson | 1,000 | Transient non-community | Groundwater |
| 23 | Tiba - Boldt Castle | Jefferson | 1,000 | Transient non-community | Surface water |
| 24 | Theresa Village | Jefferson | 950 | Community | Purchased groundwater |
| 25 | Antwerp Village | Jefferson | 900 | Community | Groundwater |
| 26 | Thousand Island Park Corp. | Jefferson | 900 | Transient non-community | Surface water |
| 27 | Cape Vincent Town Wd 3, 4, & 6 | Jefferson | 770 | Community | Purchased surface water |
| 28 | Watertown Town Wd 3 & 4 & 5 | Jefferson | 750 | Community | Purchased surface water |
| 29 | Orleans Town Wd 1 (Lafargeville) | Jefferson | 750 | Community | Groundwater |
| 30 | Hounsfield Wd 2 | Jefferson | 725 | Community | Purchased surface water |
| 31 | Henderson Town Wd 1,2 | Jefferson | 700 | Community | Surface water |
| 32 | Orleans Town Wd 2 (Rt 12) | Jefferson | 690 | Community | Purchased surface water |
| 33 | Champion Wd 2, 4 & 5 | Jefferson | 650 | Community | Groundwater |
| 34 | Evans Mills Village | Jefferson | 644 | Community | Groundwater |
| 35 | Chaumont Village | Jefferson | 625 | Community | Purchased surface water |
| 36 | Brownville (T) Wd #1 | Jefferson | 600 | Community | Purchased surface water |
| 37 | Kring Point State Park | Jefferson | 600 | Transient non-community | Surface water |
| 38 | Watertown Town Wd 1 & 2 | Jefferson | 600 | Community | Purchased surface water |
| 39 | Wellesley Island Water Corp. | Jefferson | 548 | Community | Surface water |
| 40 | Northland Estates | Jefferson | 540 | Community | Groundwater |
| 41 | Southwick Beach State Park | Jefferson | 520 | Transient non-community | Surface water |
| 42 | Alexandria Town Wd #2 - Redwood | Jefferson | 500 | Community | Purchased surface water |
| 43 | Glen Park Village | Jefferson | 500 | Community | Purchased groundwater |
| 44 | Leray Town Wd 3 | Jefferson | 480 | Community | Purchased groundwater |
| 45 | Hounsfield Wd 1, 5 | Jefferson | 480 | Community | Purchased surface water |
| 46 | Mannsville Village | Jefferson | 450 | Community | Groundwater under influence of surface water |
| 47 | Deferiet Village | Jefferson | 420 | Community | Groundwater |
| 48 | Creekstone Farms | Jefferson | 400 | Transient non-community | Groundwater |
| 49 | Champion Wd 1 (Great Bend) | Jefferson | 400 | Community | Purchased groundwater |
| 50 | Lyme Town Wd 2 | Jefferson | 400 | Community | Purchased surface water |
All other water systems in Jefferson County (105)
The remaining active systems filed under Jefferson County, largest first, with the population each reports serving.
- Wilsons Hyde Lake Campsites375
- Long Point State Park - Jefferson Cty360
- Northwoods Estates315
- Association Island R.V. Resort &Marina307
- Indian River Estates, Ltd.303
- Riverside Acres300
- Black River Bay Campground300
- Krings Trailer Park300
- Hounsfield Wd 3 (Wescott Beach)270
- Wilna T Wd 1240
- Tiba - Yacht House211
- Whistle Stop Tavern200
- Wilna T Wd 2200
- Natalis Restaurant200
- Pinehurst on the St. Lawrence200
- Birch Haven Campground200
- Southside Water Inc..195
- Cold Springs Golf Course195
- Rodman Town Wd 1180
- Canoe-Picnic Point State Park175
- 4-H Camp Wabasso175
- Brennans Bay Campground and Marina164
- Northernaire Park160
- C-Way Motel & Resort160
- Meadowlane Park160
- Sargents on Swan Bay/Kountry Kottage150
- Pamelia Town Wd #2150
- Crystal Lake Campground150
- Shangri-La Campground150
- Lanzs Motel Inc..148
- Brownville (T) Wd #2140
- Pines Trailer Park136
- Roosevelt Trailer Park/Cot.132
- Cals Cottages130
- Wagoners Marina & Trailer Prk125
- Barton & Healys Cottgs/Trlprk120
- Theresa Bowling Center100
- Cold Creek Studios90
- Wayside Inn - Jefferson Cty90
- Willows on the Lake90
- Merry Knoll Travel Trailer Pk.85
- Up the Creek Campground80
- Sportsmans Hideaway80
- Mils Rivershore Cottgs/Motel75
- Tricias Rondette Restaurant70
- Lyme Town Wd 1 & 470
- Thousand Island Trailer Park70
- Gutchess Brookville70
- Fair Wind Lodge60
- Steiners General Store60
- Guffin Bay Resort & Marina60
- Ponds Marina & Trailer Park60
- Alexandria Town Wd #1 - Otter Street60
- Swan Bay Estates & Marina Ltd.54
- Lawrence View Park50
- West Winds Motel/Cottages50
- Shady Pines50
- Flying Spatula 150
- Hidden Harbor50
- Dry Hill Ski Area50
- 7 Acres Trailer Park50
- Mary Island State Park50
- Two Sisters Diner50
- Birdie Bites/La Golf50
- Bay Vue Park48
- Credo Community Center45
- Lyellton Drive45
- Rainbow Shore Trailer Park44
- Arrowhead Trailer Park42
- Genes Fishing Camp40
- Hoopers Harbor, LLC40
- Ontario Shores T/P & Marina39
- Boathouse Marine34
- Riverwood Estates30
- Twisted30
- Dewolf Point State Park30
- Depauville Hotel30
- Mars Pizza30
- Hi-Da-Way Cottages30
- Us Coast Guard - Wellesley Island29
- Wehle State Park26
- Land of Lakes Shoppette & Gas26
- Southbound Comfort Station26
- Northbound Comfort Station26
- Hunney Bee Bakery26
- Sls on the River LLC Dba Chateau25
- Hillbilly Inn25
- Tiba -U.S. Customs25
- Southwicks General Store25
- Rock Island Lighthouse State Park25
- Bassetts Captain Clayton25
- Dollar General (Theresa)25
- Wellesley Island Market25
- Harbors End, Inc..25
- Nut N Fanci25
- River Golf Adventures25
- Whitecaps Market25
- North Country Store25
- Burrville Cider Mill25
- Chaumont River Rv Park25
- Keithas Kafe25
- Clayton Distillery25
- Aujla Corner25
- Wright Diner (the)25
- Stewarts Shop 44125
Jefferson County water systems: frequently asked questions
How many public water systems are in Jefferson County, New York?
EPA's SDWIS records file 157 active public water systems under Jefferson County, New York: 57 community systems (36%), 4 non-transient non-community systems (2.5%) and 96 transient non-community systems (61%).
Who supplies drinking water in Jefferson County, NY?
The largest community water systems filed under Jefferson County are Fort Drum (34,000 people served), Watertown City (27,861 people served) and Leray Town Wd 1, 2, 4 (7,140 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.
Does Jefferson County's drinking water come from groundwater or surface water?
Of the 157 active public water systems in Jefferson County, 67% draw mainly on groundwater and 33% on surface water, counting purchased supplies. The largest system, Fort Drum, uses purchased surface water.
Where can I find a water quality report for Jefferson County?
Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 57 community systems are filed under Jefferson County, so the report to look for is the one from the system that supplies your address.
How can I check violations for a water system in Jefferson County?
Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.
More New York water systems
- All New York public water systems· 8,167 active
- Otsego County· 190 systems
- Broome County· 170 systems
- Oswego County· 163 systems
- Clinton County· 161 systems
- Steuben County· 153 systems
- Suffolk County· 151 systems
- How to find out who supplies your drinking water
- How to find and read your annual water quality report
About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Public water systems in Jefferson County, New York”, https://aquacensus.com/water-systems/new-york/jefferson (data as of October 1, 2026).