Putnam-Blue Lake
Putnam-Blue Lake in Putnam County, Florida has a water quality grade of B (Good). Water clarity: 7.5 ft visibility. Phosphorus: 14 µg/L.
- Clarity
- 7.5 ft
- Type
- Mesotrophic
- Trend
- ↓ Declining
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Putnam-Blue Lake is a mesotrophic lake in Putnam County, Florida. Water quality is graded B based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. Compared to the 27 other monitored lakes in Putnam County, Putnam-Blue Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-04-03. 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)
Moderate clarity, visible to about 7.5 ft. Phosphorus level: 14 µg/L. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.5 ft | Not graded |
| Phosphorus | 14 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Putnam-Blue Lake
Compare lakeside cabins, hotels, and vacation rentals near Putnam-Blue Lake in Putnam 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 Putnam-Blue Lake
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Fishing Putnam-Blue Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.32 m/yr | 5 |
| Phosphorus | → Stable | -0.15 µg/L/yr | 5 |
County Ranking
Ranked #3 of 28 lakes in Putnam County
Nearby Lakes in Putnam County
Frequently asked questions about Putnam-Blue Lake
Where is Putnam-Blue Lake?
- Putnam-Blue Lake is a lake in Putnam County, Florida. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Putnam-Blue Lake?
- Putnam-Blue Lake in Putnam County, Florida has a water quality grade of B (Good). Water clarity: 7.5 ft visibility. Phosphorus: 14 µg/L.
Is Putnam-Blue Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Putnam-Blue Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
Explore Putnam-Blue Lake across LakeQuality
More Florida Lake Rankings
Other Grade B Lakes in Florida
Mesotrophic Lakes in Florida
Where this data comes from
288 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_WQX288 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.