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Important for you to know:

  • New to WDFN: customize and keep track of your list of favorite monitoring locations and data types using the new My Favorites page. To learn more, read our announcement on our Water Data for the Nation blog.

Hydrological Unit: Northern Long Island

HUC Name
0203020101 Hempstead Harbor-Frontal Long Island Sound
0203020102 Oyster Bay-Frontal Long Island Sound
0203020103 Nissequogue River-Frontal Long Island Sound
0203020104 Fishers Island Sound-Long Island Sound
Monitoring Locations