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Important for you to know:

  • New to WDFN: see current water conditions throughout the state using the new State Pages. Filter by continuous data type and age of data, view latest values, and link to graphing options to explore the data further. To learn more, read our announcement on the 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