Jefferson County, New York — public water systems

157 active public water systems serve Jefferson County, reporting 130.6K people served.

Dataset updated July 2026 . Source: EPA SDWIS/ECHO, refreshed quarterly.

Active systems

157

Population served

130.6K

Community systems

Groundwater share

66.9%

Water systems in Jefferson County

Active public water systems in Jefferson County, New York
#	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	Adams Village	Jefferson	2,000	Community	Groundwater
9	Can-Am Speedway	Jefferson	2,000	Transient non-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	Rutland Town Wd 1	Jefferson	1,500	Community	Purchased groundwater
16	Cape Vincent Village	Jefferson	1,500	Community	Surface water
17	Ellisburg Wd 1, 2 & 3	Jefferson	1,500	Community	Groundwater
18	Stone Mills Museum	Jefferson	1,500	Transient non-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	Tiba - Boldt Castle	Jefferson	1,000	Transient non-community	Surface water
23	Wellesley Island State Park	Jefferson	1,000	Transient non-community	Groundwater
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	Orleans Town Wd 1 (Lafargeville)	Jefferson	750	Community	Groundwater
29	Watertown Town Wd 3 & 4 & 5	Jefferson	750	Community	Purchased surface water
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	Lyme Town Wd 2	Jefferson	400	Community	Purchased surface water
50	Champion Wd 1 (Great Bend)	Jefferson	400	Community	Purchased groundwater