- Acton
- Acushnet
- Ashfield Water District
- Attleboro
- Ayer
- Belchertown
- Bernardston
- Blandford
- Blackstone
- Boxborough
- Brimfield
- Buckland
- Carlisle
- Carver
- Chester
- Chelmsford
- Chesterfield
- Douglas
- Eastham
- Florida
- Freetown
- Great Barrington
- Groton
- Hanson
- Hardwick
- Harwich
- Holliston
- Hopkinton
- Hopedale
- Hubbardston
- Kingston
- Lakeville
- Leominster
- Lunenburg
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- Maynard
- Mendon
- Medway
- Millbury
- Millville
- Montague
- Newburyport
- North Reading
- Pembroke
- Petersham
- Phillipston
- Plymouth
- Rockland
- Shelburne Falls Water District
- Sudbury
- Sutton
- Sandwich
- Sturbridge
- Sunderland
- Templeton
- Townsend
- Upton
- Uxbridge
- Walpole
- Wayland
- Wellesley
- West Boylston
- West Stockbridge
- Westborough
- Weston
- Whately
- Wilmington
- Winchendon
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