Hill County Lake Quality
Texas, 5 lakes, average grade D (Poor)
Hill County has 5 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. 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 (B); the most-stressed is Lake Whitney Nolands River Arm (D).
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
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Whitney Lake | B | 4.8 ft | 20 µg/L |
| 2 | Aquilla Reserv Aquilla Creek Arm Lake | C | 2.2 ft | 45 µg/L |
| 3 | Aquilla Reservoir | D | 2.1 ft | 40 µg/L |
| 4 | Lake Whitney Nolands River Arm | D | 1.3 ft | 80 µg/L |
| 5 | Aquilla Reservoir Hackberry Creek Arm | D | 1.7 ft | 60 µg/L |
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 17 states.
Where to stay near Hill County
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Source: EPA National Aquatic Resource Surveys, 2026.