Clay-Lily Lake
Clay County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Clay-Lily Lake. Here is what has been measured.
- Mesotrophic
- Impaired · Metals (other than mercury)
Clay-Lily Lake in Clay County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 11 ft visibility. Phosphorus: 11 µg/L.
Clay-Lily Lake is a mesotrophic lake in Clay County, Florida. Water clarity is declining over recent sampling years. Compared to the 16 other monitored lakes in Clay County, Clay-Lily Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-01-26. Methodology: how these readings are compared.
What Clay-Lily Lake is good for
From access and monitoring records, not editorial picks.
- Clear water11 ft of visibility
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. Clay-Lily Lake is listed impaired under Clean Water Act §303(d) (IR 5) for metals (other than mercury). Check local advisories before you swim.
Whether Clay-Lily 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 Clay-Lily Lake
These are the measurements Florida DEP publishes for Clay-Lily Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 11 ft. Phosphorus 11 µg/L. TSI 41.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 11ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 11µg/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. | 41 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Clay-Lily Lake
Answers come straight from the public measurements and survey records on this page.
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Fishing Clay-Lily Lake
Water Quality Trend: Stable
Based on 6 years of monitoring (2020–2025).
Water clarity
Worsening6 years
Phosphorus
Improving-0.39 µg/L/yr6 years
EPA Impairment Status
Clay-Lily 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 FL2509H · Official waterbody report
Nearby Lakes in Clay County
Frequently asked questions about Clay-Lily Lake
Where is Clay-Lily Lake?
- Clay-Lily Lake is a lake in Clay County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Clay-Lily Lake?
- Clay-Lily Lake in Clay County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 11 ft visibility. Phosphorus: 11 µg/L.
Is Clay-Lily Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Clay-Lily Lake is listed impaired under Clean Water Act §303(d) (IR 5) for metals (other than mercury). Check local advisories before you swim.
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Where this data comes from
269 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_WQX269 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