Davis County Lake Quality
Utah, 5 lakes, average grade D (Nutrient-rich)
Davis County holds 5 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. 2 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. On average, Davis 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 Gsl Farmington Bay Outflow Lake (D); the most-stressed is Farmington Bay Lake (F).
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Quick Answers for Davis County
Planning a trip? Check special fishing regulations for Gsl Farmington Bay Outflow Lake — or check the official Utah fishing regulations.
All Lakes in Davis County
5 lakes · 2 graded, 3 not rated2 graded lakes · 3 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | DGsl Farmington Bay Outflow LakeDavis | D | 1 ft | 484.5 µg/L | 27.8 µg/L | No recent samples | ✓ Public |
| 2 | FFarmington Bay LakeDavis | F | No recent samples | 405 µg/L | 106 µg/L | No recent samples | Not recorded |
| NRHolmes ReservoirDavis | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRGreat Salt LakeDavis | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRGreat Salt LakeDavis | 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 Davis 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.