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Index of Connecticut towns listed by town number showing major basins and regional basins in each town.

This page covers the towns Andover - Morris. For towns Naugatuck - Woodstock click HERE

Town #

Town Name

Major Basin #

Major Basin Name

Regional Basin #

 Regional Basin Name
1 Andover 3 Thames 31 Willimantic
1 Andover 4 Connecticut 47 Salmon
2 Ansonia 5 South Central Coast 53 South Central Western Complex
2 Ansonia 6 Housatonic 60 Housatonic Main Stem
2 Ansonia 6 Housatonic 69 Naugatuck
3 Ashford 3 Thames 31 Willimantic
3 Ashford 3 Thames 32 Natchaug
4 Avon 4 Connecticut 43 Farmington
4 Avon 4 Connecticut 44 Park
5 Barkhamsted 4 Connecticut 43 Farmington
6 Beacon Falls 6 Housatonic 69 Naugatuck
7 Berlin 4 Connecticut 46 Mattabesset
7 Berlin 5 South Central Coast 52 Quinnipiac
8 Bethany 5 South Central Coast 53 South Central Western Complex
8 Bethany 6 Housatonic 69 Naugatuck
9 Bethel 6 Housatonic 60 Housatonic Main Stem
9 Bethel 6 Housatonic 66 Still
9 Bethel 7 Southwest Coast 72 Saugatuck
10 Bethlehem 6 Housatonic 67 Shepaug
10 Bethlehem 6 Housatonic 68 Pomperaug
10 Bethlehem 6 Housatonic 69 Naugatuck
11 Bloomfield 4 Connecticut 40 Connecticut Main Stem
11 Bloomfield 4 Connecticut 43 Farmington
11 Bloomfield 4 Connecticut 44 Park
12 Bolton 3 Thames 31 Willimantic
12 Bolton 4 Connecticut 40 Connecticut Main Stem
12 Bolton 4 Connecticut 45 Hockanum
12 Bolton 4 Connecticut 47 Salmon
13 Bozrah 3 Thames 30 Thames Main Stem
13 Bozrah 3 Thames 39 Yantic
14 Branford 5 South Central Coast 50 South Central Shoreline
14 Branford 5 South Central Coast 51 South Central Eastern Complex
15 Bridgeport 7 Southwest Coast 70 Southwest Shoreline
15 Bridgeport 7 Southwest Coast 71 Southwest Eastern
16 Bridgewater 6 Housatonic 60 Housatonic Main Stem
16 Bridgewater 6 Housatonic 67 Shepaug
17 Bristol 4 Connecticut 43 Farmington
17 Bristol 5 South Central Coast 52 Quinnipiac
17 Bristol 6 Housatonic 69 Naugatuck
18 Brookfield 6 Housatonic 60 Housatonic Main Stem
18 Brookfield 6 Housatonic 64 Candlewood
18 Brookfield 6 Housatonic 66 Still
19 Brooklyn 3 Thames 37 Quinebaug
19 Brooklyn 3 Thames 38 Shetucket
20 Burlington 4 Connecticut 43 Farmington
20 Burlington 6 Housatonic 69 Naugatuck
21 Canaan 6 Housatonic 60 Housatonic Main Stem
21 Canaan 6 Housatonic 61 Blackberry
21 Canaan 6 Housatonic 62 Hollenbeck
22 Canterbury 3 Thames 37 Quinebaug
22 Canterbury 3 Thames 38 Shetucket
23 Canton 4 Connecticut 43 Farmington
24 Chaplin 3 Thames 32 Natchaug
24 Chaplin 3 Thames 38 Shetucket
25 Cheshire 5 South Central Coast 52 Quinnipiac
25 Cheshire 5 South Central Coast 53 South Central Western Complex
25 Cheshire 6 Housatonic 69 Naugatuck
26 Chester 4 Connecticut 40 Connecticut Main Stem
26 Chester 5 South Central Coast 51 South Central Eastern Complex
27 Clinton 5 South Central Coast 50 South Central Shoreline
27 Clinton 5 South Central Coast 51 South Central Eastern Complex
28 Colchester 3 Thames 39 Yantic
28 Colchester 4 Connecticut 47 Salmon
28 Colchester 4 Connecticut 48 Eightmile
29 Colebrook 4 Connecticut 43 Farmington
30 Columbia 3 Thames 31 Willimantic
30 Columbia 3 Thames 39 Yantic
30 Columbia 4 Connecticut 47 Salmon
31 Cornwall 6 Housatonic 60 Housatonic Main Stem
31 Cornwall 6 Housatonic 62 Hollenbeck
31 Cornwall 6 Housatonic 67 Shepaug
32 Coventry 3 Thames 31 Willimantic
33 Cromwell 4 Connecticut 40 Connecticut Main Stem
33 Cromwell 4 Connecticut 46 Mattabesset
34 Danbury 6 Housatonic 64 Candlewood
34 Danbury 6 Housatonic 66 Still
34 Danbury 7 Southwest Coast 72 Saugatuck
34 Danbury 8 Hudson 81 Croton
35 Darien 7 Southwest Coast 70 Southwest Shoreline
35 Darien 7 Southwest Coast 74 Southwest Western Complex
36 Deep River 4 Connecticut 40 Connecticut Main Stem
36 Deep River 5 South Central Coast 51 South Central Eastern Complex
37 Derby 5 South Central Coast 53 South Central Western Complex
37 Derby 6 Housatonic 60 Housatonic Main Stem
37 Derby 6 Housatonic 69 Naugatuck
38 Durham 4 Connecticut 40 Connecticut Main Stem
38 Durham 4 Connecticut 46 Mattabesset
38 Durham 5 South Central Coast 51 South Central Eastern Complex
38 Durham 5 South Central Coast 52 Quinnipiac
39 Eastford 3 Thames 32 Natchaug
39 Eastford 3 Thames 37 Quinebaug
39 Eastford 3 Thames 38 Shetucket
40 East Granby 4 Connecticut 41 Stony Brook
40 East Granby 4 Connecticut 43 Farmington
41 East Haddam 4 Connecticut 40 Connecticut Main Stem
41 East Haddam 4 Connecticut 47 Salmon
41 East Haddam 4 Connecticut 48 Eightmile
42 East Hampton 4 Connecticut 40 Connecticut Main Stem
42 East Hampton 4 Connecticut 47 Salmon
43 East Hartford 4 Connecticut 40 Connecticut Main Stem
43 East Hartford 4 Connecticut 45 Hockanum
44 East Haven 5 South Central Coast 50 South Central Shoreline
44 East Haven 5 South Central Coast 51 South Central Eastern Complex
44 East Haven 5 South Central Coast 52 Quinnipiac
45 East Lyme 2 Southeast Coast 20 Southeast Shoreline
45 East Lyme 2 Southeast Coast 22 Southeast Western Complex
45 East Lyme 4 Connecticut 40 Connecticut Main Stem

45

 East Lyme 4 Connecticut 48 Eightmile
46 Easton 6 Housatonic 60 Housatonic Main Stem
46 Easton 7 Southwest Coast 71 Southwest Eastern
46 Easton 7 Southwest Coast 72 Saugatuck
47 East Windsor 4 Connecticut 40 Connecticut Main Stem
47 East Windsor 4 Connecticut 42 Scantic
48 Ellington 3 Thames 31 Willimantic
48 Ellington 4 Connecticut 40 Connecticut Main Stem
48 Ellington 4 Connecticut 42 Scantic
48 Ellington 4 Connecticut 45 Hockanum
49 Enfield 4 Connecticut 40 Connecticut Main Stem
49 Enfield 4 Connecticut 42 Scantic
50 Essex 4 Connecticut 40 Connecticut Main Stem
50 Essex 5 South Central Coast 51 South Central Eastern Complex
51 Fairfield 7 Southwest Coast 70 Southwest Shoreline
51 Fairfield 7 Southwest Coast 71 Southwest Eastern
51 Fairfield 7 Southwest Coast 72 Saugatuck
52 Farmington 4 Connecticut 43 Farmington
52 Farmington 4 Connecticut 44 Park
52 Farmington 5 South Central Coast 52 Quinnipiac
53 Franklin 3 Thames 38 Shetucket
53 Franklin 3 Thames 39 Yantic
54 Glastonbury 4 Connecticut 40 Connecticut Main Stem
54 Glastonbury 4 Connecticut 45 Hockanum
54 Glastonbury 4 Connecticut 47 Salmon
55 Goshen 6 Housatonic 62 Hollenbeck
55 Goshen 6 Housatonic 67 Shepaug
55 Goshen 6 Housatonic 69 Naugatuck
56 Granby 4 Connecticut 40 Connecticut Main Stem
56 Granby 4 Connecticut 43 Farmington
57 Greenwich 7 Southwest Coast 70 Southwest Shoreline
57 Greenwich 7 Southwest Coast 74 Southwest Western Complex
58 Griswold 3 Thames 36 Pachaug
58 Griswold 3 Thames 37 Quinebaug

59

 Groton 2 Southeast Coast 20 Southeast Shoreline
59 Groton 2 Southeast Coast 21 Southeast Eastern Complex
59 Groton 3 Thames 30 Thames Main Stem
60 Guilford