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LakeQuality
Late afternoon sun over Slim Lake, scattering a bright path across wind-textured water
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Ste. Genevieve County Lake Quality

Missouri, 10 lakes, average grade A (Excellent)

Ste. Genevieve County has 10 monitored lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. 1 of those lake carry an A–F grade. The county-level summary describes that subset, not every water body listed. On average, Ste. Genevieve County lakes grade an A. That puts it near the top of the Missouri county ranking.

The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Goose Creek Lake (A); the most-stressed is Goose Creek Lake (A).

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Quick Answers for Ste. Genevieve County

Cleanest lakes in Ste. Genevieve County →Cleanest lakes in Missouri →Safest swimming lakes in Missouri →

Planning a trip? Check special fishing regulations for Goose Creek Lake — or check the official Missouri fishing regulations.

All Lakes in Ste. Genevieve County

10 lakes · 1 graded, 9 not rated1 graded lake · 9 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicAccess
1AGoose Creek LakeSte. GenevieveA9.9 ft9.5 µg/L2 µg/LNo recent samplesNot recorded
NRSunset LakeSte. GenevieveNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRButterfly LakeSte. GenevieveNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDonze LakeSte. GenevieveNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHook PondSte. GenevieveNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake AnneSte. GenevieveNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake Wanda LeeSte. GenevieveNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake SkiSte. GenevieveNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake OcieSte. GenevieveNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRErb LakeSte. GenevieveNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded

NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.

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Other Counties in Missouri

Clark County

2 lakes · Avg grade A

Washington County

9 lakes · Avg grade A

Pike County

5 lakes · Avg grade A

Ripley County

3 lakes · Avg grade A

Mercer County

4 lakes · Avg grade A

Perry County

5 lakes · Avg grade A

See how Ste. Genevieve County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..

Source: EPA National Aquatic Resource Surveys, 2026.