Flagler-Emerald Lake
Flagler County, FloridaEutrophic
Flagler-Emerald Lake is a productive, nutrient-rich eutrophic lake in Flagler County, Florida. Water quality is graded D based on 2 sampling years through 2023. Compared to the 12 other monitored lakes in Flagler County, Flagler-Emerald Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Florida DNR, last sampled 2023-03-17. Grade methodology: LakeGrade methodology.
Watch Flagler-Emerald Lake water quality
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 1.8 ft of visibility. Phosphorus level: 57 µg/L. Trophic State Index: 66.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.8 ft | F |
| Phosphorus | 57 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 66 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Location
County Ranking
Ranked #3 of 13 lakes in Flagler County
Nearby Lakes in Flagler County
More Florida Lake Rankings
Other Grade D Lakes in Florida
Eutrophic Lakes in Florida
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Flagler-Emerald Lake under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 1 facility has a reported Clean Water Act violation in the past three years.
- Flagler Beach WwtfFlagler Beach · 3 mi away · NPDES FL0026611MajorRecent violation
- Beverly Beach - Ocean City UtiBeverly Beach · 0.7 mi away · NPDES FL0039756
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-03-17
Monitoring stations: 3
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