Johnson County Lake Quality
Texas, 3 lakes, average grade F (Algae-prone)
Johnson County holds 3 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 average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Pat Cleburne Reservoir (F) is the cleanest in the county.
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Quick Answers for Johnson County
Planning a trip? Check special fishing regulations for Pat Cleburne Reservoir — or check the official Texas fishing regulations.
All Lakes in Johnson County
3 lakes · 1 graded, 2 not rated1 graded lake · 2 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | FPat Cleburne ReservoirJohnson | F | 2.4 ft | 50 µg/L | 46.9 µg/L | No recent samples | ✓ Public |
| NRCleburne State Park LakeJohnson | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRLake CharcaJohnson | NR | No recent samples | 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 Texas
See how Johnson County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.