Flagler-Emerald Lake
Flagler County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Flagler-Emerald Lake. Here is what has been measured.
- Eutrophic
- Public access
Flagler-Emerald Lake in Flagler County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 1.8 ft visibility. Phosphorus: 57 µg/L.
Flagler-Emerald Lake is a productive, nutrient-rich eutrophic lake in Flagler County, Florida. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available. Compared to the 8 other monitored lakes in Flagler County, Flagler-Emerald Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2023-03-17. Methodology: how these readings are compared.
Swimming conditions
Readings onlyModerate algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Flagler-Emerald Lake is safe to swim in today is a call for the Florida Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Flagler-Emerald Lake
These are the measurements Florida DEP publishes for Flagler-Emerald Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1.8 ft of visibility. Phosphorus 57 µg/L. TSI 66.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.8ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 57µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 66 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Flagler-Emerald Lake
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Stays near Flagler-Emerald Lake
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Fishing Flagler-Emerald Lake
Water quality readings over time
3 seasons of samples on record (2020–2022). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Worsening3 years
Phosphorus
Stable-0.5 µg/L/yr3 years
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.
Nearby Lakes in Flagler County
Frequently asked questions about Flagler-Emerald Lake
Where is Flagler-Emerald Lake?
- Flagler-Emerald Lake is a lake in Flagler County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Flagler-Emerald Lake?
- Flagler-Emerald Lake in Flagler County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 1.8 ft visibility. Phosphorus: 57 µg/L.
Is Flagler-Emerald Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Can I fish at Flagler-Emerald Lake?
- Public access to Flagler-Emerald Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Florida's fish and wildlife agency, so check its current regulations before you go.
Explore Flagler-Emerald Lake across LakeQuality
Planning a trip around Fort Matanzas?
Flagler-Emerald Lake is about 15 miles from Fort Matanzas National Monument. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Fort Matanzas →More lakes in Florida
Other Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
173 measurements from 3 monitoring stations, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FLORIDA LAKEWATCH
21FLKWAT_WQX173 samples · 2020–2023
Monitoring station identifiers (3)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)