Suffolk County Water Authority

East Farmingdale Water District

Greenlawn Water District

Dix Hills Water District

Brentwood Water District

Stony Brook Water District

Saint James Water District

Smithtown Water District

Riverhead Water District

Greenport Village Water System

Hampton Bays Water District

Ocean Bay Park Water Corporation

Saltaire Village

Shelter Island Heights Property Owners Corp.

Manhasset-Lakeville Water District

Glenswood Water District

Williston Park Village

Garden City South Water District

Bayville Village

Oyster Bay Water District

Locust Valley Water District

Glen Cove City

Sea Cliff Water Company - Aquarion

Port Washington Water District

Sands Point Village

Plandome Village

Water Authority of Great Neck North

Albertson Water District

Old Westbury Village

Jericho Water District

Garden City Park Water District

Mineola Village

Carle Place Water District

Westbury Water District

Hicksville Water District

Plainview Water District

Bethpage Water District

Roslyn Water District

Farmingdale Village

South Farmingdale Water District

Massapequa Water District

New York Water Service

Franklin Square Water District

Garden City Village

Roosevelt Field Water District

Mitchell Field

Bowling Green Water District

Levittown Water District

East Meadow Water District

Uniondale Water District

Hempstead Village

West Hempstead - West Hempstead Gardens

Rockville Centre Village

Long Island American Water

Freeport Village

New York Water Service

Long Beach City

Lido Point Lookout Water District

Water Authority of Western Nassau

South Huntington Water District