Bay-Marin Lake
Bay-Marin Lake in Bay County, Florida has a water quality grade of B (Good). Water clarity: 10.5 ft visibility. Phosphorus: 8 µg/L.
- Clarity
- 10.5 ft
- Type
- Oligotrophic
- Trend
- → Stable
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Bay-Marin Lake is a cold, clear oligotrophic lake in Bay County, Florida. Water quality is graded B based on 1 sampling years through 2025. Water clarity is declining over recent sampling years. Compared to the 4 other monitored lakes in Bay County, Bay-Marin Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-01-29. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLow algae
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.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Good clarity, visible to about 10.5 ft. Phosphorus level: 8 µg/L. Trophic State Index: 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.5 ft | Not graded |
| Phosphorus | 8 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Bay-Marin Lake
Compare lakeside cabins, hotels, and vacation rentals near Bay-Marin Lake in Bay County, Florida — 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.
Top-rated places to stay near Bay-Marin Lake
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Planning a whole trip? See where to stay at Florida’s top lakes →
Fishing Bay-Marin Lake
Water Quality Trend: → Stable
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.46 m/yr | 5 |
| Phosphorus | ↑ Improving | -0.55 µg/L/yr | 5 |
EPA Impairment Status
Bay-Marin Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL1113 · Official waterbody report · Matched by proximity (0.81 km)
County Ranking
Ranked #3 of 5 lakes in Bay County
Nearby Lakes in Bay County
Frequently asked questions about Bay-Marin Lake
Where is Bay-Marin Lake?
- Bay-Marin Lake is a lake in Bay County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Bay-Marin Lake?
- Bay-Marin Lake in Bay County, Florida has a water quality grade of B (Good). Water clarity: 10.5 ft visibility. Phosphorus: 8 µg/L.
Is Bay-Marin Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Bay-Marin Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
Explore Bay-Marin Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Oligotrophic Lakes in Florida
Where this data comes from
347 measurements from 3 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX347 samples · 2020–2025
Monitoring station identifiers (3)
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database