Westchester County, New York — public water systems

271 active public water systems serve Westchester County, reporting 992.6K people served.

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

Active systems

271

Population served

992.6K

Community systems

Groundwater share

84.1%

Water systems in Westchester County

Active public water systems in Westchester County, New York
#	Water system	County	Population served	Type	Source
1	Yonkers City	Westchester	211,569	Community	Purchased surface water
2	Veolia Water New York, Inc.. Rd-1	Westchester	146,732	Community	Purchased surface water
3	Mount Vernon Water Department	Westchester	73,893	Community	Purchased surface water
4	Westchester Joint Water Works	Westchester	59,629	Community	Surface water
5	White Plains City	Westchester	59,559	Community	Purchased surface water
6	Veolia Water New York, Inc.. Rd-2	Westchester	57,301	Community	Purchased surface water
7	Greenburgh Consolidated Wd #1	Westchester	39,993	Community	Purchased surface water
8	Yorktown Consold. Water Dist.#1	Westchester	36,000	Community	Purchased surface water
9	Ossining Water Department	Westchester	30,000	Community	Surface water
10	Cortlandt Consolidated Wd	Westchester	28,369	Community	Purchased surface water
11	Peekskill City	Westchester	24,272	Community	Surface water
12	Scarsdale Water Department	Westchester	21,649	Community	Purchased surface water
13	Kensico Water District	Westchester	17,917	Community	Purchased surface water
14	New Castle/Stanwood W.D.	Westchester	17,116	Community	Purchased surface water
15	Mount Kisco Water Department	Westchester	11,187	Community	Surface water
16	Tarrytown Water Supply	Westchester	11,000	Community	Purchased surface water
17	Sleepy Hollow (Village)	Westchester	9,870	Community	Purchased surface water
18	Pleasantville Water District	Westchester	9,550	Community	Purchased surface water
19	Briarcliff Manor Village	Westchester	9,190	Community	Purchased surface water
20	Bedford Consolidated W.D.	Westchester	9,056	Community	Purchased surface water
21	Croton on Hudson Village	Westchester	8,000	Community	Groundwater
22	Irvington Water Supply	Westchester	6,631	Community	Purchased surface water
23	Larchmont Village	Westchester	6,485	Community	Purchased surface water
24	Westchester County Wd #3	Westchester	6,000	Community	Purchased surface water
25	Elmsford Village	Westchester	5,293	Community	Purchased surface water
26	Heritage Hills Water System	Westchester	4,700	Community	Groundwater
27	Somers Consolidated Water District #1	Westchester	3,848	Community	Purchased surface water
28	Montrose Improvement District	Westchester	3,100	Community	Purchased surface water
29	Fox Lane High & Middle Schools	Westchester	3,000	Non-transient non-community	Groundwater
30	Pace University	Westchester	2,753	Community	Purchased surface water
31	North Castle Water District #1	Westchester	2,500	Community	Purchased surface water
32	Buchanan Village	Westchester	2,200	Community	Purchased surface water
33	Old Farm Hill Water District	Westchester	1,768	Community	Purchased surface water
34	Old Post Road Water District	Westchester	1,500	Community	Purchased groundwater
35	John Jay Senior High School	Westchester	1,425	Non-transient non-community	Groundwater
36	North Castle Water District #4	Westchester	1,225	Community	Groundwater
37	North Castle Water District #2	Westchester	1,200	Community	Groundwater
38	Somers High School	Westchester	1,189	Non-transient non-community	Groundwater
39	Saint Joseph Church (New)	Westchester	1,000	Transient non-community	Groundwater
40	Bedford Rest Area Nys Rt 684	Westchester	1,000	Transient non-community	Groundwater
41	Greenbriar Subdivision	Westchester	956	Community	Groundwater
42	John Jay Middle School	Westchester	945	Non-transient non-community	Groundwater
43	Primrose School	Westchester	900	Non-transient non-community	Groundwater
44	Seven-Eleven Store	Westchester	900	Transient non-community	Groundwater
45	Oakridge Water District	Westchester	892	Community	Groundwater
46	John F Kennedy High School	Westchester	840	Non-transient non-community	Groundwater
47	Wild Oaks Water Company	Westchester	805	Community	Groundwater under influence of surface water
48	Swiss Re of America	Westchester	800	Non-transient non-community	Groundwater
49	Byram Hills High School	Westchester	800	Non-transient non-community	Groundwater
50	Somers Middle School	Westchester	790	Non-transient non-community	Groundwater