Albertson WD
NassauRoslyn Heights13,500 served
TMB
An open index · 64 districts
Long Island's water districts, mapped in one place.
Find your water district and learn how to submit a DOH-1013 backflow test. Public records joined from NYS DEC service-area data and NYS DOH contact reports — searchable, browsable, free.
Whether you're a Nassau or Suffolk County property owner figuring out who supplies your water, a licensed backflow tester preparing a DOH-1013 submission, or a water district administrator updating your listing — start here.
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At a glance
- Nassau
- 43
- Suffolk
- 21
- People served
- 2.8M
- Counties
- 2
Source: NYS Department of Environmental Conservation · NYS Department of Health.
Explore the map
Pick an address from the suggestions to locate its district.
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64/ 64districts
A
1B
3- Submit DOH-1013 via Potaflow StartBayville (V)NassauBayville6,700 servedEmail
- Submit DOH-1013 via Potaflow StartBethpage WDNassauBethpage33,000 servedEmail
C
3D
2E
1- Submit DOH-1013 via Potaflow StartEast Williston (V)NassauEast Williston2,556 servedEmail
F
4- Submit DOH-1013 via Potaflow StartFranklin Square WDNassauFranklin Square20,000 servedEmail
- Submit DOH-1013 via Potaflow StartFreeport (V)NassauFreeport45,000 servedEmail
G
6- Garden City (V)NassauGarden City46,000 servedBSI
- Submit DOH-1013 via Potaflow StartGarden City Park WDNassauGarden City Park18,000 servedEmail
- Submit DOH-1013 via Potaflow StartGlen Cove CityNassauGlen Cove28,000 servedEmail
H
3- Hempstead (V)NassauHempstead56,000 servedVEPO
- Submit DOH-1013 via Potaflow StartHicksville WDNassauHicksville48,000 servedEmail
J
2- Submit DOH-1013 via Potaflow StartJericho WDNassauSyosset58,000 servedEmail
L
7- Submit DOH-1013 via Potaflow StartLocust Valley WDNassauLocust Valley7,500 servedEmail
M
3- Manhasset Lakeville WDNassauGreat Neck43,000 servedVEPO
- Submit DOH-1013 via Potaflow StartMassapequa WDNassauMassapequa43,000 servedEmail
- Submit DOH-1013 via Potaflow StartMineola (V)NassauMineola20,600 servedEmail
N
1O
3- Submit DOH-1013 via Potaflow StartOld Westbury (V)NassauOld Westbury4,700 servedEmail
P
5- Submit DOH-1013 via Potaflow StartPlainview WDNassauPlainview34,000 servedEmail
- Submit DOH-1013 via Potaflow StartPort Washington WDNassauPort Washington34,000 servedEmail
R
4- Submit DOH-1013 via Potaflow StartRockville Centre (V)NassauRockville Centre24,700 servedEmail
- Submit DOH-1013 via Potaflow StartRoslyn WDNassauRoslyn17,000 servedEmail
S
10- Submit DOH-1013 via Potaflow StartSands Point (V)NassauPort Washington2,900 servedEmail
- Submit DOH-1013 via Potaflow StartSouth Farmingdale WDNassauFarmingdale44,700 servedEmail
T
1- Submit DOH-1013 via Potaflow StartTown of Hempstead Water DepartmentNassauEast Meadow110,000 servedEmail
W
5- Submit DOH-1013 via Potaflow StartWA of Western NassauNassauNew Hyde Park120,000 servedEmail
- Submit DOH-1013 via Potaflow StartWest Hempstead WDNassauWest Hempstead32,031 servedEmail
- Submit DOH-1013 via Potaflow StartWestbury WDNassauWestbury20,500 servedEmail
- Submit DOH-1013 via Potaflow StartWilliston Park (V)NassauWilliston Park7,287 servedEmail
Sources
Geography: NYS Department of Environmental Conservation, Public Water Supply Service Areas. Contacts: NYS Department of Health Public Water System Contact Reports. Suffolk contact details are limited to NYS DEC fields until the equivalent NYSDOH report is integrated.
Generated May 15, 2026.
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