St. Lawrence County, New York — public water systems

226 active public water systems serve St. Lawrence County, reporting 81.1K people served.

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

Active systems

226

Population served

81.1K

Community systems

Groundwater share

93.8%

Water systems in St. Lawrence County

Active public water systems in St. Lawrence County, New York
#	Water system	County	Population served	Type	Source
1	Massena Village	St. Lawrence	16,729	Community	Surface water
2	Ogdensburg City	St. Lawrence	10,064	Community	Surface water
3	Potsdam Village	St. Lawrence	8,312	Community	Surface water
4	Canton Village	St. Lawrence	7,055	Community	Groundwater
5	Gouverneur	St. Lawrence	4,263	Community	Surface water
6	East Louisville Water District	St. Lawrence	3,235	Community	Surface water
7	Norfolk Water District	St. Lawrence	2,300	Community	Groundwater
8	Norwood	St. Lawrence	1,685	Community	Groundwater
9	Star Lake Water District	St. Lawrence	1,250	Community	Surface water
10	Waddington Village	St. Lawrence	944	Community	Groundwater
11	Colton Water District	St. Lawrence	850	Community	Groundwater
12	Heuvelton Village	St. Lawrence	830	Community	Groundwater
13	Edwards-Knox Central School	St. Lawrence	800	Non-transient non-community	Groundwater
14	Madrid Water District	St. Lawrence	800	Community	Groundwater
15	Madrid-Waddington Central School	St. Lawrence	700	Non-transient non-community	Groundwater
16	Massawepie Scout Camps	St. Lawrence	600	Transient non-community	Groundwater
17	Jakes on the Water	St. Lawrence	517	Transient non-community	Groundwater
18	Cranberry Lake Campground	St. Lawrence	500	Transient non-community	Groundwater
19	Lisbon Water District	St. Lawrence	499	Community	Groundwater
20	Dekalb Water District	St. Lawrence	492	Community	Purchased groundwater
21	Hermon Water District	St. Lawrence	492	Community	Groundwater
22	Hermon-Dekalb Central School	St. Lawrence	492	Non-transient non-community	Groundwater
23	St. Lawrence Central Jr-Sr High	St. Lawrence	490	Non-transient non-community	Groundwater
24	Coles Creek State Campsite	St. Lawrence	470	Transient non-community	Groundwater
25	Edwards Water District	St. Lawrence	465	Community	Groundwater
26	St. Lawrence Central Elementary	St. Lawrence	460	Non-transient non-community	Groundwater
27	Parishville Water District #1	St. Lawrence	450	Community	Groundwater
28	Robert Moses State Park	St. Lawrence	407	Transient non-community	Groundwater
29	Town of Lisbon Campground	St. Lawrence	400	Transient non-community	Groundwater
30	Higley Flow State Park	St. Lawrence	400	Transient non-community	Groundwater
31	Morristown Water District	St. Lawrence	395	Community	Surface water
32	Hammond Central School	St. Lawrence	380	Non-transient non-community	Groundwater
33	Postwood Park	St. Lawrence	350	Transient non-community	Groundwater
34	Gran View	St. Lawrence	350	Transient non-community	Groundwater
35	Wal-Mart Potsdam	St. Lawrence	350	Non-transient non-community	Groundwater
36	Southwest Tech	St. Lawrence	272	Non-transient non-community	Groundwater
37	Corning	St. Lawrence	260	Non-transient non-community	Groundwater
38	Nypa Hawkins Point Visitors Center	St. Lawrence	260	Transient non-community	Groundwater
39	Schermerhorn Landing-Duck Cove	St. Lawrence	250	Transient non-community	Groundwater
40	Seaway Area Technology Center	St. Lawrence	250	Non-transient non-community	Groundwater
41	Stables @ Windy Point	St. Lawrence	250	Transient non-community	Groundwater
42	Schermerhorn Harbor LLC	St. Lawrence	250	Transient non-community	Groundwater
43	Chars Bar	St. Lawrence	221	Transient non-community	Groundwater
44	Potsdam Water District No. 1	St. Lawrence	220	Community	Groundwater
45	New York Power Authority	St. Lawrence	200	Non-transient non-community	Surface water
46	Wanakena Water Company	St. Lawrence	200	Community	Groundwater under influence of surface water
47	Gerald Roy Amvets Post #4	St. Lawrence	200	Transient non-community	Groundwater
48	Waddington Town Beach	St. Lawrence	200	Transient non-community	Groundwater
49	Mclears Cottage Colony Inc.	St. Lawrence	200	Transient non-community	Groundwater
50	Helena Water District	St. Lawrence	180	Community	Groundwater