Specimen ID | Common Name | State | County | Locality | Year |
| Drainage name | Status |
877579
| monoecious hydrilla | CT | Fairfield | Crystal Lake (Held Pond) | 2009 |
01100006
| Saugatuck | established |
877578
| monoecious hydrilla | CT | Fairfield | Silvermine River | 2007 |
01100006
| Saugatuck | established |
270050
| monoecious hydrilla | CT | Fairfield | Silvermine River | 2009 |
01100006
| Saugatuck | established |
1523973
| hydrilla | CT | Hartford | [Keeney Cove] | 2016 |
01080205
| Lower Connecticut | established |
1322352
| hydrilla | CT | Hartford | Connecticut River, at Riverfront Park and Boathouse ramp, Glastonbury | 2016 |
01080205
| Lower Connecticut | established |
1633925
| hydrilla | CT | Hartford | Connecticut River, Glastonbury | 2017 |
01080205
| Lower Connecticut | established |
1523972
| hydrilla | CT | Hartford | CT-3 S [Keeney Cove] | 2016 |
01080205
| Lower Connecticut | established |
1633926
| hydrilla | CT | Middlesex | Connecticut River, Haddam | 2018 |
01080205
| Lower Connecticut | established |
1633927
| hydrilla | CT | Middlesex | Connecticut River, Middletown | 2018 |
01080205
| Lower Connecticut | established |
1409798
| monoecious hydrilla | CT | New Haven | Hilltop Rd., small shallow pond near road | 2005 |
01100005
| Housatonic | unknown |
228833
| monoecious hydrilla | CT | New London | Mason Island, three miles from the Mystic site. | 1987 |
02030203
| Long Island Sound | established |
877577
| monoecious hydrilla | CT | New London | Mystic Seaport pond at intersection of Rossie and Greenmanville | 2005 |
01100003
| Thames | established |
229183
| monoecious hydrilla | CT | New London | Mystic, pond located near a major tourist attraction with an outlet to a salt water river | 1996 |
01100003
| Thames | established |
879785
| monoecious hydrilla | CT | Tolland | Coventry Lake [Wangumbaug Lake], Coventry town | 2015 |
01100002
| Shetucket | established |