Jones County Lake Quality
Iowa, 2 lakes, average grade D (Nutrient-rich)
Jones County holds 2 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. 1 of those lake carry an A–F grade. The county-level summary describes that subset, not every water body listed. The county-wide average grade is D — water quality issues are persistent across most of the monitored basins. 0 lakes fall into the F bracket outright.
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 Central Park Lake (D); the most-stressed is Central Park Lake (D).
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Quick Answers for Jones County
Planning a trip? Check special fishing regulations for Central Park Lake — or check the official Iowa fishing regulations.
All Lakes in Jones County
2 lakes · 1 graded, 1 not rated1 graded lake · 1 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | DCentral Park LakeJones | D | 3.3 ft | 59 µg/L | 23.2 µg/L | No recent samples | Not recorded |
| NRCentral Park LakeJones | NR | 1.6 ft | No recent samples | No recent samples | No recent samples | Not 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 Iowa
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Source: EPA National Aquatic Resource Surveys, 2026.