Polk County, Florida · Water Quality Report Card
Beulah Lake
Beulah Lake in Polk County, Florida has a water quality grade of B (Good). Water clarity: 2.3 ft visibility. Phosphorus: 32 µg/L.
- Clarity
- 2.3 ft
- Type
- Eutrophic
- Trend
- ↓ Declining
Beulah Lake is a productive, nutrient-rich eutrophic lake in Polk County, Florida. Water quality is graded B based on 1 sampling years through 2023. Overall water quality is declining over recent sampling years. Compared to the 176 other monitored lakes in Polk County, Beulah Lake ranks #78 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2023-09-20. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Very murky, less than 2.3 ft of visibility. Phosphorus level: 32 µg/L. Trophic State Index: 60.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.3 ft | |
| Phosphorus | 32 µg/L | Good |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Beulah Lake
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Fishing Beulah Lake
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.013 m/yr | 6 |
| Phosphorus | → Stable | -0.97 µg/L/yr | 6 |
Location
County Ranking
Ranked #78 of 177 lakes in Polk County
Nearby Lakes in Polk County
Explore Beulah Lake across LakeGrade
More Florida Lake Rankings
Other Grade B Lakes in Florida
Eutrophic Lakes in Florida
More records, surveys & data sources
Where this data comes from
40 measurements from 1 monitoring station, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples40 samples · 2020–2023
Monitoring station identifiers (1)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2023-09-20
Monitoring stations: 1