Hill County Lake Quality
Texas, 3 lakes, average grade D (Nutrient-rich)
Hill County has 3 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. 2 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. On average, Hill 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 Whitney Lake (D); the most-stressed is Lake Whitney Nolands River Arm (F).
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Quick Answers for Hill County
Planning a trip? Check special fishing regulations for Whitney Lake — or check the official Texas fishing regulations.
All Lakes in Hill County
3 lakes · 2 graded, 1 not rated2 graded lakes · 1 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | DWhitney LakeHill | D | 4.8 ft | 20 µg/L | 14.6 µg/L | No recent samples | ✓ Public |
| 2 | FLake Whitney Nolands River ArmHill | F | 1.3 ft | 80 µg/L | 59.2 µg/L | No recent samples | ✓ Public |
| NRAquilla Reservoir Raw Water IntakeHill | NR | 2 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.
Lake Match
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Other Counties in Texas
See how Hill 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.