Union-Butler Lake
Union County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Union-Butler Lake. Here is what has been measured.
- Eutrophic
- Impaired · Mercury
Union-Butler Lake in Union County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3 ft visibility. Phosphorus: 23 µg/L.
Union-Butler Lake is a productive, nutrient-rich eutrophic lake in Union County, Florida. Overall water quality is declining over recent sampling years. Compared to the 4 other monitored lakes in Union County, Union-Butler Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-02-21. Methodology: how these readings are compared.
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. Union-Butler Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
Whether Union-Butler 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 Union-Butler Lake
These are the measurements Florida DEP publishes for Union-Butler 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 3 ft of visibility. Phosphorus 23 µg/L. TSI 55.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 23µg/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. | 55 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Union-Butler Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Union-Butler Lake typically sits around 74°F at the surface in October. Summer average is about 87°F. Usually warmest in Aug (about 87°F) and coldest in Mar (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 14 field readings (2010–2018) via the EPA Water Quality Portal. See the full Union-Butler Lake water temperature breakdown →
Stays via Stay22
Stays near Union-Butler Lake
Compare lakeside cabins, hotels, and vacation rentals near Union-Butler Lake in Union 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 Union-Butler Lake
Water Quality Trend: Worsening
Based on 6 years of monitoring (2020–2025).
Water clarity
Worsening6 years
Phosphorus
Stable+0.05 µg/L/yr6 years
EPA Impairment Status
Union-Butler 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 FL3566 · Official waterbody report
Nearby Lakes in Union County
Frequently asked questions about Union-Butler Lake
Where is Union-Butler Lake?
- Union-Butler Lake is a lake in Union County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Union-Butler Lake?
- Union-Butler Lake in Union County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3 ft visibility. Phosphorus: 23 µg/L.
Is Union-Butler Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Union-Butler 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 Union-Butler Lake?
- Union-Butler Lake typically sits around 74°F at the surface in October, from 14 EPA Water Quality Portal field readings (2010–2018). That is a typical value for the month, not a live reading.
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Where this data comes from
48 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_WQX48 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