Liberty-Mystic Lake
Liberty County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Liberty-Mystic Lake. Here is what has been measured.
- Oligotrophic
- Impaired · Mercury
- 50 ft max depth
Liberty-Mystic Lake in Liberty County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 13 ft visibility. Phosphorus: 7 µg/L.
Liberty-Mystic Lake is a cold, clear oligotrophic lake in Liberty County, Florida with an estimated average depth of about 50 feet. Compared to the 1 other monitored lakes in Liberty County, Liberty-Mystic Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-02-10. Methodology: how these readings are compared.
What Liberty-Mystic Lake is good for
From access and monitoring records, not editorial picks.
- Clear water13 ft of visibility
Swimming conditions
Readings onlyLow 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. Liberty-Mystic Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Liberty-Mystic 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 Liberty-Mystic Lake
These are the measurements Florida DEP publishes for Liberty-Mystic Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 13 ft. Phosphorus 7 µg/L. TSI 36.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 13ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 7µg/L | Good 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. | 36 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Liberty-Mystic Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~50 ft est.
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Florida has not published bathymetry for Liberty-Mystic Lake.
Lake Size & Watershed
Watershed (drainage) area
1 sq mi
HydroLAKES / HydroSHEDS
Surface area
101 acres
HydroLAKES / HydroSHEDS
Shoreline
1.5 mi
HydroLAKES / HydroSHEDS
Elevation
144 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
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Stays near Liberty-Mystic Lake
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Fishing Liberty-Mystic Lake
Water Quality Trend: Stable
Based on 5 years of monitoring (2020–2024).
Water clarity
Stable5 years
Phosphorus
Stable-0.1 µg/L/yr5 years
EPA Impairment Status
Liberty-Mystic Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL926A1 · Official waterbody report
Nearby Lakes in Liberty County
Frequently asked questions about Liberty-Mystic Lake
Where is Liberty-Mystic Lake?
- Liberty-Mystic Lake is a lake in Liberty County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Liberty-Mystic Lake?
- Liberty-Mystic Lake in Liberty County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 13 ft visibility. Phosphorus: 7 µg/L.
Is Liberty-Mystic Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Liberty-Mystic Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Liberty-Mystic Lake?
- No published bathymetric survey covers Liberty-Mystic Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 50 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Liberty-Mystic Lake across LakeQuality
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Where this data comes from
171 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_WQX171 samples · 2020–2025
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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)