Nolan County Lake Quality
Texas, 4 lakes, average grade B (Good)
Nolan County holds 4 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. 1 of those lake carry an A–F grade. The county-level summary describes that subset, not every water body listed. With an average grade of B, Nolan County sits comfortably above the Texas median.
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 Sweetwater Mid Lake (B); the most-stressed is Lake Sweetwater Mid Lake (B).
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Quick Answers for Nolan County
Planning a trip? Check special fishing regulations for Lake Sweetwater Mid Lake — or check the official Texas fishing regulations.
All Lakes in Nolan County
4 lakes · 1 graded, 3 not rated1 graded lake · 3 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | BLake Sweetwater Mid LakeNolan | B | 3.6 ft | 30 µg/L | 8.3 µg/L | No recent samples | ✓ Public |
| NRLake TrammellNolan | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRSanta Fe LakeNolan | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRHeadrick LakeNolan | NR | No recent samples | 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.
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Other Counties in Texas
See how Nolan 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.