Grayson County Lake Quality
Texas, 1 lakes, average grade C (Fair)
Grayson County has 1 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 C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
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 Lake Texoma (C); the most-stressed is Lake Texoma (C).
Quick Answers for Grayson County
Planning a trip? Check special fishing regulations for Lake Texoma — or check the official Texas fishing regulations.
All Lakes in Grayson County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lake Texoma | C | 2.2 ft | 75.5 µg/L |
Other Counties in Texas
See how Grayson County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 17 states.
Where to stay near Grayson County
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Source: EPA National Aquatic Resource Surveys, 2026.