Lilly Lake
Orange County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Lilly Lake. Here is what has been measured.
- Eutrophic
- Impaired · Oxygen depletion (low DO)
- Limited data
Lilly Lake in Orange County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3 ft visibility. Phosphorus: 32 µg/L.
Lilly Lake is a productive, nutrient-rich eutrophic lake in Orange County, Florida. Overall water quality is declining over recent sampling years. Compared to the 319 other monitored lakes in Orange County, Lilly Lake ranks #140 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-02-05. Methodology: how these readings are compared.
Swimming conditions
Readings onlyBacteria tested: exceedances
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.
Based on E. coli testing, Lilly Lake frequently exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 14.8% of 27 samples across 8 seasons.
This is a historical summary of past testing, not a current condition — bacteria levels change quickly, especially after rain. Always check Florida’s current beach and health-department advisories before swimming.
Whether Lilly 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 Lilly Lake
These are the measurements Florida DEP publishes for Lilly 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 32 µg/L. TSI 58.
| 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 | 32µg/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. | 58 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Lilly Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Lilly Lake typically sits around 69°F at the surface in November. Summer average is about 82°F. Usually warmest in Aug (about 82°F) and coldest in Feb (about 65°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (65°F) to its warmest (82°F).
Typical surface water temperature by month, from 32 field readings (2011–2025) via the EPA Water Quality Portal. See the full Lilly Lake water temperature breakdown →
Stays via Stay22
Stays near Lilly Lake
Compare lakeside cabins, hotels, and vacation rentals near Lilly Lake in Orange 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 Lilly Lake
Prices for Oct 16–18, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Florida’s top lakes →
Follow Lilly Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Lilly Lake
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2024).
Water clarity
Worsening5 years
Phosphorus
Worsening+0.8 µg/L/yr5 years
EPA Impairment Status
Lilly Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life.
Source: EPA ATTAINS assessment unit FL2872C · Official waterbody report
Nearby Lakes in Orange County
Frequently asked questions about Lilly Lake
Where is Lilly Lake?
- Lilly Lake is a lake in Orange County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Lilly Lake?
- Lilly Lake in Orange County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3 ft visibility. Phosphorus: 32 µg/L.
Is Lilly Lake safe to swim in?
- Based on E. coli testing, Lilly Lake frequently exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 14.8% of 27 samples across 8 seasons. That is a historical summary of past bacteria testing, not a current reading and not a swimming clearance. Bacteria levels can spike quickly after heavy rain, so whether Lilly Lake is safe to swim in today is a call for Florida's water agency and the county health department; check their current beach advisories before you swim.
What is the water temperature of Lilly Lake?
- Lilly Lake typically sits around 69°F at the surface in November, from 32 EPA Water Quality Portal field readings (2011–2025). That is a typical value for the month, not a live reading.
Explore Lilly Lake across LakeQuality
More lakes in Florida
Other Lakes in Florida
Eutrophic Lakes in Florida
Where this data comes from
42 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 samples42 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