Tom Green County Lake Quality
Texas, 6 lakes, average grade C (Fair)
Only 6 lakes in Tom Green County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. Tom Green County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
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 Twin Buttes Reserv Lake (C); the most-stressed is O C Fisher Reservoir (D).
Quick Answers for Tom Green County
Planning a trip? Check special fishing regulations for Twin Buttes Reserv Lake — or check the official Texas fishing regulations.
All Lakes in Tom Green County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Twin Buttes Reserv Lake | C | 3.6 ft | - |
| 2 | Lake Nasworthy Middle Concho | C | 1.5 ft | 40 µg/L |
| 3 | Lake Nasworthy S Concho Arm | C | 1 ft | 30 µg/L |
| 4 | Lake Nasworthy | C | 1.8 ft | 30 µg/L |
| 5 | Twin Buttes Reservoir | C | 1.2 ft | 35 µg/L |
| 6 | O C Fisher Reservoir | D | 1 ft | 65 µg/L |
Other Counties in Texas
See how Tom Green 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 Tom Green County
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Source: EPA National Aquatic Resource Surveys, 2026.