Water Providers in Nassau County
- Albertson Water District
- Bethpage Water District
- City of Plainview Utilities
- Farmingdale Water
- Franklin Square Water District
- Freeport Water
- Garden City Water
- Glen Cove Water
- Hicksville Water District
- Jericho Water District
- Long Beach Water Department
- Manhasset Lakeville Water District
- Massapequa Water District
- Mineola Water Department
- New York American Water - Sea Cliff
- NY American Water - Lynbrook
- NY American Water – Merrick, New York
- Oyster Bay Water District
- Port Washington Water District
- Rockville Centre Water
- South Farmingdale Water District
- Town of Hempstead Water
- Town Of Hempstead Water Department
- Water Authority Of Great Neck North
- Water Authority of Western Nassau County (WAWNC)
- Westbury Water District
- West Hempstead Water District
Water Providers by City
- East Meadow
- Farmingdale
- Freeport
- Garden
- Glen Cove
- Glen Cove
- Glen Head
- Glenwood Landing
- Great Neck
- Great Neck Estates
- Great Neck Plaza
- Hempstead
- Hempstead
- Hempstead
- Hempstead
- Hempstead Town and Stewart Manor Village
- Kensington
- Kings Point
- Long Beach
- Lynbrook Village
- Massapequa Park Village and Oyster Bay Town
- Mineola
- North Hempstead
- North Hempstead
- North Hempstead
- Old Brookville
- Oyster Bay
- Oyster Bay
- Plainview
- Port Washington
- Rockville Centre
- Roslyn Harbor
- Saddle Rock
- Thomaston
- Village of Sea Cliff
- Westbury
- West Hempstead
