Lancaster County Lake Quality
Wisconsin, 36 lakes, average grade C (Fair)
There are 36 graded lakes in Lancaster County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
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 Susq 44b Lake (B); the most-stressed is Susq 47a Lake (F).
Quick Answers for Lancaster County
Planning a trip? Check special fishing regulations for Susq 44b Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Lancaster County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Susq 44b Lake | B | - | - | 28 µg/L |
| 2 | Susq 34a Lake | B | - | - | 26 µg/L |
| 3 | Susq 22b Lake | C | - | - | 54 µg/L |
| 4 | Susq 47b Lake | C | - | - | 36 µg/L |
| 5 | Susq 18b Lake | C | - | - | 36 µg/L |
| 6 | Susq 38b Lake | C | - | - | 36 µg/L |
| 7 | Susq 18a Lake | C | - | - | 46 µg/L |
| 8 | Susq 44a Lake | C | - | - | 49 µg/L |
| 9 | Susq 30b Lake | C | - | - | 53 µg/L |
| 10 | Susq 44c Lake | C | - | - | 32 µg/L |
| 11 | Susq 30a Lake | C | - | - | 56 µg/L |
| 12 | Susq 53b Lake | C | - | - | 36 µg/L |
| 13 | Susq 22c Lake | C | - | - | 32 µg/L |
| 14 | Susq 18c Lake | C | - | - | 48 µg/L |
| 15 | Susq 47c Lake | C | - | - | 48 µg/L |
| 16 | 1c Lake | C | - | - | 52 µg/L |
| 17 | 1j Lake | C | - | - | 56 µg/L |
| 18 | 1f Lake | C | - | - | 42 µg/L |
| 19 | Oct16 Lake | C | - | - | 46 µg/L |
| 20 | Susq 38c Lake | D | - | - | 68 µg/L |
| 21 | Susq 26c Lake | D | - | - | 62 µg/L |
| 22 | Susq 30c Lake | D | - | - | 82 µg/L |
| 23 | Susq 34c Lake | D | - | - | 62 µg/L |
| 24 | Susq 34b Lake | D | - | - | 72 µg/L |
| 25 | Susq 38a Lake | D | - | - | 70 µg/L |
| 26 | Susq 26b Lake | D | - | - | 74 µg/L |
| 27 | Susq 26a Lake | D | - | - | 66 µg/L |
| 28 | Susq 53c Lake | D | - | - | 62 µg/L |
| 29 | Susq 53a Lake | D | - | - | 72 µg/L |
| 30 | Octr 1.0 Lake | D | - | - | 74 µg/L |
| 31 | Octr 2.0 Lake | D | - | - | 88 µg/L |
| 32 | Octr 0.0 Lake | D | - | - | 68 µg/L |
| 33 | 1a Lake | D | - | - | 74 µg/L |
| 34 | 1h Lake | D | - | - | 72 µg/L |
| 35 | Oct10 Lake | D | - | - | 62 µg/L |
| 36 | Susq 47a Lake | F | - | - | 94 µg/L |
Source: EPA National Aquatic Resource Surveys, 2026.