The Water Quality Classification Maps are an element of the Connecticut Water Quality Standards and show the class assigned to each surface water and ground water resource throughout the state. The Water Quality Classification Maps have been adopted and are amended from time to time pursuant to the statutory process described in section 22a-426 of the Connecticut General Statutes. The maps are used to relate designated uses and the applicable Standards and Criteria for each class of surface and ground water resource to a specific location.

To view the current Water Quality Classification Map, select a town of interest from the map or select from drop down menu below.

Choose Town - - - - - - - Andover Ansonia Ashford Avon Barkhamsted Beacon Falls Berlin Bethany Bethel Bethlehem Bloomfield Bolton Bozrah Branford Bridgeport Bridgewater Bristol Brookfield Brooklyn Burlington Canaan Canterbury Canton Chaplin Cheshire Chester Clinton Colchester Colebrook Columbia Cornwall Coventry Cromwell Danbury Darien Deep River Derby Durham East Granby East Haddam East Hampton East Hartford East Haven East Lyme East Windsor Eastford Easton Ellington Enfield Essex Fairfield Farmington Franklin Glastonbury Goshen Granby Greenwich Griswold Groton Guilford Haddam Hamden Hampton Hartford Hartland Harwinton Hebron Kent Killingly Killingworth Lebanon Ledyard Lisbon Litchfield Lyme Madison Manchester Mansfield Marlborough Meriden Middlebury Middlefield Middletown Milford Monroe Montville Morris Naugatuck New Britain New Canaan New Fairfield New Hartford New Haven New London New Milford Newington Newtown Norfolk North Branford North Canaan North Haven North Stonington Norwalk Norwich Old Lyme Old Saybrook Orange Oxford Plainfield Plainville Plymouth Pomfret Portland Preston Prospect Putnam Redding Ridgefield Rocky Hill Roxbury Salem Salisbury Scotland Seymour Sharon Shelton Sherman Simsbury Somers South Windsor Southbury Southington Sprague Stafford Stamford Sterling Stonington Stratford Suffield Thomaston Thompson Tolland Torrington Trumbull Union Vernon Voluntown Wallingford Warren Washington Waterbury Waterford Watertown West Hartford West Haven Westbrook Weston Westport Wethersfield Willington Wilton Winchester Windham Windsor Windsor Locks Wolcott Woodbridge Woodbury Woodstock

GIS Shapefiles of the Water Quality Classifications (Ground Water Quality Classifications Polygon, Surface Water Quality Classification Line or Surface Water Quality Classification Polygon) are available for download on the GIS Data web page.

Content last updated on June 4, 2019