Olc Lake
Alachua County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Olc Lake. Here is what has been measured.
- Eutrophic
- Impaired · Algal growth
Olc Lake in Alachua County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 2 ft visibility. Phosphorus: 36.8 µg/L.
Olc Lake is a productive, nutrient-rich eutrophic lake in Alachua County, Florida. Water clarity is improving over recent sampling years. Compared to the 30 other monitored lakes in Alachua County, Olc Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2024-12-17. Methodology: how these readings are compared.
Swimming conditions
Readings onlyRecreation use not supported
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. Olc Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for algal growth, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Olc 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 Olc Lake
These are the measurements Florida DEP publishes for Olc 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 2 ft of visibility. Phosphorus 36.8 µg/L. TSI 62.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 36.8µg/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. | 62 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Olc Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Olc Lake typically sits around 76°F at the surface in October. Summer average is about 86°F. Usually warmest in Jul (about 87°F) and coldest in Jan (about 57°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (57°F) to its warmest (87°F).
Typical surface water temperature by month, from 69 field readings (2010–2024) via the EPA Water Quality Portal. See the full Olc Lake water temperature breakdown →
Stays via Stay22
Stays near Olc Lake
Compare lakeside cabins, hotels, and vacation rentals near Olc Lake in Alachua County, Florida — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Fishing Olc Lake
Water Quality Trend: Stable
Based on 5 years of monitoring (2020–2024).
Water clarity
Improving5 years
Phosphorus
Worsening+1.81 µg/L/yr5 years
EPA Impairment Status
Olc 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, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit FL2749A · Official waterbody report
Nearby Lakes in Alachua County
Frequently asked questions about Olc Lake
Where is Olc Lake?
- Olc Lake is a lake in Alachua County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Olc Lake?
- Olc Lake in Alachua County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 2 ft visibility. Phosphorus: 36.8 µg/L.
Is Olc Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Olc Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for algal growth, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
What is the water temperature of Olc Lake?
- Olc Lake typically sits around 76°F at the surface in October, from 69 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
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Where this data comes from
77 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- St. Johns River Water Management District
21FLSJWM_WQX77 samples · 2020–2024
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