Rockwall County Lake Quality
Texas, 4 lakes, average grade F (Algae-prone)
Rockwall County has 4 monitored 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. 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. Lake Ray Hubbard (F) is the cleanest in the county.
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Quick Answers for Rockwall County
Planning a trip? Check special fishing regulations for Lake Ray Hubbard — or check the official Texas fishing regulations.
All Lakes in Rockwall County
4 lakes · 1 graded, 3 not rated1 graded lake · 3 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | FLake Ray HubbardRockwall | F | 2 ft | 64 µg/L | 31.8 µg/L | No recent samples | ✓ Public |
| NRPhelps LakeRockwall | NR | 0.6 ft | 180 µg/L | 22 µg/L | No recent samples | ✓ Public | |
| NRCaruth LakeRockwall | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRRockwall LakeRockwall | 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 Rockwall 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.