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LakeQuality

Faucet Snail

Invasive SpeciesFound in 44 lakes

Faucet Snail appears on the {{stateName}} infested-waters lists for 44 surface waters. Boaters and anglers moving gear in or out of those lakes carry a clean-drain-dry obligation under state law. 44 lakes — narrow enough that aggressive containment is still on the table. Most upper-Midwest invasives that established here did so quietly over a decade before anyone noticed, so a low number today is not a guarantee for tomorrow.

The presence of Faucet Snail does not directly change a lake's LakeGrade rubric score — the grade measures the water itself, not the species inhabiting it. But invasive presence is a meaningful adjacent signal worth reading alongside the grade.

44
Total Lakes
37
Minnesota
7
Wisconsin

Lakes with Faucet Snail

LakeCountyStateGradeDepth
Lower Bottle LakeHubbardMNA110 ft
Upper Bottle LakeHubbardMNA55 ft
Su18 LakeCookMNA-
Su19 LakeCookMNA-
Superior LakeCookMNA-
Superior LakeSt. LouisMNA-
Ls94 LakeLakeMNA-
Suseq32a LakeSt. LouisMNA-
Seq044a LakeLakeMNA-
Suseq44a LakeLakeMNA-
Seq032a LakeSt. LouisMNA-
Paddock LakeKenoshaWIA32 ft
Lower Phantom LakeWaukeshaWIA12 ft
Ucil LakeOcontoWIA-
Long LakeHubbardMNA135 ft
George LakeHubbardMNA29 ft
Duck LakeHubbardMNA23 ft
Boulder LakeHubbardMNA28 ft
Lake WinnibigoshishCassMNA69.8 ft
Tamarack Bay LakeCassMNA69.8 ft
Shawano LakeShawanoWIA39.5 ft
Sugar LakeItascaMNB22 ft
Little Lake DeepCookMNB-
South Long LakeCrow WingMNB47 ft
Upper Twin LakeHubbardMNB12 ft
Fourth Crow Wing LakeHubbardMNB10 ft
Third River Flowage LakeItascaMNB69.8 ft
Teal Lake DeepCookMNC-
Cut Foot Sioux LakeItascaMNC-
Lower Twin LakeWadenaMNC26 ft
Stocking LakeWadenaMNC22 ft
Bowstring LakeItascaMNC32 ft
Lake WinneconneWinnebagoWIC9 ft
Lake Butte des MortsWinnebagoWIC9 ft
Lake PoyganWinnebagoWIC11 ft
Third Crow Wing LakeHubbardMNC35 ft
Blackduck LakeBeltramiMNC28 ft
First Crow Wing LakeHubbardMNC15 ft
Blackwater LakeItascaMND72 ft
Robinson LakeWabashaMND-
Little Cut Foot LakeItascaMND20 ft
Knife LakeKanabecMNF15 ft
Little Lake InletCookMNF-
Little Lake LandingCookMNF-

Frequently Asked Questions

How many lakes have faucet snail?

Faucet Snail has been documented in 44 lakes, 37 in Minnesota and 7 in Wisconsin.

Does faucet snail affect water quality?

Invasive species can significantly affect lake ecosystems. They may alter nutrient cycling, displace native species, and change water clarity. Lakes with faucet snail should be monitored for changes in water quality over time.

Source: EPA National Aquatic Resource Surveys, 2026.