Denton County Lake Quality
Texas, 2 lakes, average grade D (Nutrient-rich)
Denton 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. Every one of those lakes carries an A–F grade, so the county-level summary covers the full set rather than a monitored subset. On average, Denton 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 Lewisville Lake (D); the most-stressed is Lewisville Lake (D).
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Quick Answers for Denton County
Planning a trip? Check special fishing regulations for Lewisville Lake — or check the official Texas fishing regulations.
All Lakes in Denton County
2 lakes2 graded lakes
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | DLewisville LakeDenton | D | 1.8 ft | 43 µg/L | 26.8 µg/L | No recent samples | ✓ Public |
| 2 | DRay Roberts Lake SiteDenton | D | 3.9 ft | 20.1 µg/L | 15.6 µg/L | No recent samples | ✓ Public |
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Other Counties in Texas
See how Denton 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.