Geoctref Lake
Putnam County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Geoctref Lake. Here is what has been measured.
- Impaired · Mercury
- Limited data
Geoctref Lake in Putnam County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 4.6 ft visibility. Phosphorus: 19 µg/L.
Geoctref Lake is a lake in Putnam County, Florida. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2021-08-12. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Geoctref Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
Whether Geoctref 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 Geoctref Lake
These are the measurements Florida DEP publishes for Geoctref Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 4.6 ft. Phosphorus 19 µg/L. TSI 51.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 19µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| 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. | 51 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Geoctref Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Geoctref Lake typically sits around 81°F at the surface in October. Summer average is about 86°F. Usually warmest in Jul (about 87°F) and coldest in Jan (about 60°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (60°F) to its warmest (87°F).
Typical surface water temperature by month, from 13 field readings (2019–2021) via the EPA Water Quality Portal. See the full Geoctref Lake water temperature breakdown →
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Stays near Geoctref Lake
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Fishing Geoctref Lake
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2024).
Water clarity
Stable5 years
Phosphorus
Worsening+3.88 µg/L/yr5 years
EPA Impairment Status
Geoctref 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: Aquatic life, Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL2541 · Official waterbody report
Nearby Lakes in Putnam County
Frequently asked questions about Geoctref Lake
Where is Geoctref Lake?
- Geoctref Lake is a lake in Putnam County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Geoctref Lake?
- Geoctref Lake in Putnam County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 4.6 ft visibility. Phosphorus: 19 µg/L.
Is Geoctref Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Geoctref Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
What is the water temperature of Geoctref Lake?
- Geoctref Lake typically sits around 81°F at the surface in October, from 13 EPA Water Quality Portal field readings (2019–2021). That is a typical value for the month, not a live reading.
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Where this data comes from
2 measurements from 1 monitoring station, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- FL Dept. of Environmental Protection, Northeast District
21FLA_WQX2 samples · 2021
Monitoring station identifiers (1)
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