Hydrological Unit: Carmans River-Great South Bay
| HUC | Name |
|---|---|
| 020302020301 | Town of Selden |
| 020302020302 | Carmans River |
| 020302020303 | Patchogue River-Frontal Patchogue Bay |
| 020302020304 | Swan River-Great South Bay |
| 020302020305 | Brown Creek-Great South Bay |
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