Yankee Lake
Seminole County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Yankee Lake. Here is what has been measured.
- Mesotrophic
- Impaired · pH / acidity
- Limited data
Yankee Lake in Seminole County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3 ft visibility. Phosphorus: 7.5 µg/L.
Yankee Lake is a mesotrophic lake in Seminole County, Florida. Water clarity is declining over recent sampling years. Compared to the 121 other monitored lakes in Seminole County, Yankee Lake ranks #33 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-04-10. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
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. Yankee Lake is listed impaired under Clean Water Act §303(d) (IR 4C) for pH / acidity. Check local advisories before you swim.
Whether Yankee 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 Yankee Lake
These are the measurements Florida DEP publishes for Yankee 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 7.5 µg/L. TSI 47.
| 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 | 7.5µg/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. | 47 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Yankee Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Yankee Lake typically sits around 77°F at the surface in October. Summer average is about 87°F. Usually warmest in Jul (about 87°F) and coldest in Jan (about 63°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (63°F) to its warmest (87°F).
Typical surface water temperature by month, from 63 field readings (2010–2025) via the EPA Water Quality Portal. See the full Yankee Lake water temperature breakdown →
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Stays near Yankee Lake
Compare lakeside cabins, hotels, and vacation rentals near Yankee Lake in Seminole 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.
Top-rated places to stay near Yankee Lake
Prices for Oct 16–18, 4 adults. Change dates on the map below.
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Fishing Yankee Lake
Water Quality Trend: Stable
Based on 5 years of monitoring (2020–2024).
Water clarity
Worsening5 years
Phosphorus
Improving-2.8 µg/L/yr5 years
EPA Impairment Status
Yankee Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4C).
Causes of impairment
Designated uses not supporting: Aquatic life.
Source: EPA ATTAINS assessment unit FL2961B · Official waterbody report
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Yankee Lake under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger.
- Sces/Northwest Regional StpSanford · 0.6 mi away · NPDES FL0042625Major
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 Seminole County
Frequently asked questions about Yankee Lake
Where is Yankee Lake?
- Yankee Lake is a lake in Seminole County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Yankee Lake?
- Yankee Lake in Seminole County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3 ft visibility. Phosphorus: 7.5 µg/L.
Is Yankee Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Yankee Lake is listed impaired under Clean Water Act §303(d) (IR 4C) for pH / acidity. Check local advisories before you swim.
What is the water temperature of Yankee Lake?
- Yankee Lake typically sits around 77°F at the surface in October, from 63 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
Explore Yankee Lake across LakeQuality
Planning a trip around Canaveral?
Yankee Lake is about 39 miles from Canaveral National Seashore. 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 Canaveral →More lakes in Florida
Other Lakes in Florida
Mesotrophic Lakes in Florida
Where this data comes from
38 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Submitting organization not recorded for these samples38 samples · 2020–2025
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)