Jasper County Lake Quality
Illinois, 1 lakes, average grade D (Poor)
Only 1 lakes in Jasper County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. On average, Jasper County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.
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 Newton Lake (D); the most-stressed is Newton Lake (D).
Quick Answers for Jasper County
Planning a trip? Check special fishing regulations for Newton Lake — or check the official Illinois fishing regulations.
All Lakes in Jasper County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Newton Lake | D | 1.7 ft | 82.5 µg/L |
Other Counties in Illinois
See how Jasper County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 15 states.
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Source: EPA National Aquatic Resource Surveys, 2026.