San Juan County Lake Quality
Utah, 8 lakes, average grade B (Good)
San Juan County holds 8 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. 4 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. With an average grade of B, San Juan County sits comfortably above the Utah 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 Recapture Reservoir (A); the most-stressed is Lake Powell Hite Midchannel (D).
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Quick Answers for San Juan County
Planning a trip? Check special fishing regulations for Recapture Reservoir — or check the official Utah fishing regulations.
All Lakes in San Juan County
8 lakes · 4 graded, 4 not rated4 graded lakes · 4 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | ARecapture ReservoirSan Juan | A | 8.9 ft | 15.1 µg/L | 1.7 µg/L | No recent samples | Not recorded |
| 2 | BLake Powell Off Cha CanyonSan Juan | B | 13.1 ft | 9.4 µg/L | No recent samples | No recent samples | Not recorded |
| 3 | CDark Canyon LakeSan Juan | C | 7.2 ft | 24.2 µg/L | 3.2 µg/L | No recent samples | Not recorded |
| 4 | DLake Powell Hite MidchannelSan Juan | D | 1.3 ft | 138 µg/L | No recent samples | No recent samples | ✓ Public |
| NRLake Powell Mid Channel Midway Between Trachyte Creek And Twomile CanyonSan Juan | NR | 0.2 ft | 906 µg/L | No recent samples | No recent samples | Not recorded | |
| NRTexasGulf Potash Pond Three ASan Juan | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRTexasGulf Potash Pond Three BSan Juan | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRDugout ReservoirSan Juan | 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 Utah
See how San Juan 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.