It is illegal for any Public Water System to deliver drinking water with fluoride concentrations higher than 2.0 ppm, which is still exceedingly high. Water departments deal with this issue by using filter systems to reduce the high levels of fluoride, in some cases blending with water supplies that have lower levels, or the abandonment of the water supply.
To find out the fluoride levels in your drinking water, contact your local water department. You can also go online to CDC’s My Water’s Fluoride.
Fluoridated Cities and Towns in Connecticut noted by Michael Dolan in his November 2021 Fluoridation Review:
Fluoridated cities and towns: Ansonia, Avon, Barkhamsted, Beacon Falls, Berlin, Bethany, Bethel, Bloomfield, Bozrah, Branford, Bridgeport, Bristol, Brookfield, Burlington, Cheshire, Clinton, Cromwell, Danbury, Darien, Derby, East Granby, East Hartford, East Haven, East Windsor, Easton, Ellington, Enfield, Fairfield, Farmington, Franklin, Glastonbury, Goshen, Greenwich, Groton, Guilford, Hamden, Hartford, Harwinton, Lebanon, Ledyard, Lisbon, Litchfield, Madison, Manchester, Mansfield, Meriden, Middlebury, Middletown, Milford, Monroe, Montville, Naugatuck, New Britain, New Canaan, New Hartford, New Haven, New London, Newington, Newtown, North Branford, North Haven, Norwalk, Norwich, Old Saybrook, Orange, Oxford, Plainville, Plymouth, Portland, Preston, Prospect, Redding, Ridgefield, Rocky Hill, Seymour, Shelton, South Windsor, Southington, Stamford, Stonington, Stratford, Suffield, Thomaston, Tolland, Torrington, Trumbell, Vernon, Wallingford, Waterbury, Waterford, Watertown, West Hartford, West Haven, Westbrook, Wethersfield, Wilton, Winchester, Windham, Windsor, Windsor Locks, Wolcott, Woodbridge.
Non-fluoridated cities and towns: Andover, Ashford, Bethlehem, Bolton, Bridgewater, Brooklyn, Canaan, Canterbury, Canton, Chaplin, Chester, Colchester, Colebrook, Columbia, Cornwall, Coventry, Deep River, Durham, East Haddam, East Hampton, East Lyme, Eastford, Essex, Granby, Griswold, Haddam, Hampton, Hartland, Hebron, Kent, Killingly, Killingworth, Lyme, Marlborough, Morris, New Fairfield, New Milford, Norfolk, North Canaan, North Stonington, Old Lyme, Plainfield, Pomfret, Putnam, Roxbury, Salem, Salisbury, Scotland, Sharon, Simsbury, Somers, Southbury, Sprague, Stafford, Sterling, Thompson, Union, Voluntown, Warren, Washington, Weston, Westport, Willington, Woodbury, Woodstock.