Salt Lake County Lake Quality
Utah, 5 lakes, average grade A (Excellent)
Salt Lake County has 5 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, Salt Lake County lakes grade an A. That puts it near the top of the Utah county ranking.
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 Little Dell Reservoir (A); the most-stressed is Little Dell Reservoir (A).
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Quick Answers for Salt Lake County
Planning a trip? Check special fishing regulations for Little Dell Reservoir — or check the official Utah fishing regulations.
All Lakes in Salt Lake County
5 lakes · 2 graded, 3 not rated2 graded lakes · 3 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | ALittle Dell ReservoirSalt Lake | A | 14.8 ft | 12.6 µg/L | 0.9 µg/L | No recent samples | Not recorded |
| 2 | ALake MarySalt Lake | A | 26.9 ft | 3.1 µg/L | 0.7 µg/L | No recent samples | Not recorded |
| NRTwin Lakes ReservoirSalt Lake | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRBingham Creek ReservoirSalt Lake | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRBaileys LakeSalt Lake | 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.
Lake Match
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Other Counties in Utah
See how Salt Lake 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.