Hardin County Lake Quality
Wisconsin, 7 lakes, average grade F (Very Poor)
Hardin County has 7 graded 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. The county average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.
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 Upper Pine Lake (F); the most-stressed is Upper Pine Lake (F).
Quick Answers for Hardin County
Planning a trip? Check special fishing regulations for Upper Pine Lake, whether the fish are safe to eat, and the best times to fish — or browse the full Wisconsin regulations index.
All Lakes in Hardin County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | Upper Pine Lake | F | 1.3 ft | - | - |
| 2 | Lower Pine Lake | F | 1.3 ft | - | - |
| 3 | Pine Lake South Beach | F | 1.4 ft | - | - |
| 4 | Lpinelk T Lake | F | 1.3 ft | - | - |
| 5 | Lpinelk 3 Lake | F | 0.9 ft | - | - |
| 6 | Lpinelk 2 Lake | F | 1.2 ft | - | - |
| 7 | Lpinelk 1 Lake | F | 1.4 ft | - | - |
Source: EPA National Aquatic Resource Surveys, 2026.