Little Twin Lake
Little Twin Lake in Green Lake County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.5 ft visibility.
- Clarity
- 1.5 ft
Next lake in Green Lake County
Why Little Twin Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Little Twin Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by WI DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Little Twin Lake is a lake in Green Lake County, Wisconsin.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2024-09-25. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Little Twin Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 1.5 ft of visibility. Trophic State Index: 71.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 71 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Little Twin Lake
Compare lakeside cabins, hotels, and vacation rentals near Little Twin Lake in Green Lake County, Wisconsin — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Little Twin Lake
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Fishing Little Twin Lake
EPA Impairment Status
Little Twin Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10026278 · Official waterbody report
Graded lakes near Little Twin Lake
Little Twin Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Green Lake County
Frequently asked questions about Little Twin Lake
What is the water quality grade for Little Twin Lake?
- Little Twin Lake in Green Lake County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.5 ft visibility.
Is Little Twin Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Little Twin Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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Where this data comes from
5 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX5 samples · 2024
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database