Farmington Bay Lake
Davis County, UtahView mapDirections
Nutrients and algae run well above the regional average.
- Hypereutrophic
- #5 of 6 in the county
Farmington Bay Lake in Davis County, Utah has a water quality grade of F (Algae-prone). Phosphorus: 405 µg/L. Chlorophyll-a (algae): 106 µg/L.
- Type
- Hypereutrophic
- Phosphorus
- 405 µg/L
- Chlorophyll-a
- 106 µg/L
- Trend
- → Stable
Stays via Stay22
Stays near Farmington Bay Lake
Compare lakeside cabins, hotels, and vacation rentals near Farmington Bay Lake in Davis County, Utah — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Farmington Bay Lake are listed below.
Top-rated places to stay near Farmington Bay Lake
Prices for Sep 11–13, 4 adults. Change dates on the map below.
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Watch Farmington Bay Lake’s letter
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Farmington Bay Lake is a highly nutrient-loaded hypereutrophic lake in Davis County, Utah. Water quality is graded F based on 2 sampling years through 2023. Phosphorus level is declining over recent sampling years. Compared to the 5 other monitored lakes in Davis County, Farmington Bay Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2023-10-25. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyAlgae risk
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The F is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: F (Algae-prone)
No clarity data. Phosphorus 405 µg/L. Chlorophyll-a 106 µg/L. TSI 84. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 405 µg/L | Poor |
| Chlorophyll-a (Algae) | 106 µg/L | Poor |
| Trophic State Index (TSI) | 84 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Fishing Farmington Bay Lake
Water Quality Trend: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +18.61 µg/L/yr | 7 |
| Chlorophyll-a | ↑ Improving | -18.65 µg/L/yr | 6 |
County Ranking
Ranked #5 of 6 lakes in Davis County
Nearby Lakes With Higher Grades
Farmington Bay Lake holds Grade F. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Davis County
Frequently asked questions about Farmington Bay Lake
Where is Farmington Bay Lake?
- Farmington Bay Lake is a lake in Davis County, Utah. LakeQuality grades it F for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Farmington Bay Lake?
- Farmington Bay Lake in Davis County, Utah has a water quality grade of F (Algae-prone). Phosphorus: 405 µg/L. Chlorophyll-a (algae): 106 µg/L.
Is Farmington Bay Lake safe to swim in?
- The F is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Farmington Bay Lake across LakeQuality
4 thermal springs within 22.3 mi, nearest Hooper Hot Springs
Species activity outlook by water temperature and season
Where to stay at Utah's top lakes, each with its grade
Very high nutrients, dense algae, poor clarity
Utah's cleanest and most-polluted lakes, ranked
More Utah Lake Rankings
Other Grade F Lakes in Utah
Hypereutrophic Lakes in Utah
Where this data comes from
34 measurements from 1 monitoring station, 2012–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Utah Water Science Center
USGS-UT34 samples · 2012–2023
Analytical methods
- Nutrients, brines, colorimetry
- P, wu, WCA, persulfate CF color
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.