Lillkweir Lake
Marion County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Lillkweir Lake. Here is what has been measured.
- Mesotrophic
- Impaired · Algal growth
- Limited data
Lillkweir Lake in Marion County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 5.2 ft visibility. Phosphorus: 11.5 µg/L.
Lillkweir Lake is a mesotrophic lake in Marion County, Florida. Overall water quality is improving over recent sampling years. Compared to the 17 other monitored lakes in Marion County, Lillkweir Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-07-17. 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. Lillkweir Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Lillkweir 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 Lillkweir Lake
These are the measurements Florida DEP publishes for Lillkweir Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 5.2 ft. Phosphorus 11.5 µg/L. TSI 46.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 5.2ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 11.5µg/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. | 46 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Lillkweir Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Lillkweir Lake typically sits around 76°F at the surface in October. Summer average is about 86°F. Usually warmest in Jul (about 88°F) and coldest in Jan (about 62°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (62°F) to its warmest (88°F).
Typical surface water temperature by month, from 49 field readings (2010–2025) via the EPA Water Quality Portal. See the full Lillkweir Lake water temperature breakdown →
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Stays near Lillkweir Lake
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Fishing Lillkweir Lake
Water Quality Trend: Improving
Based on 6 years of monitoring (2020–2025).
Water clarity
Improving6 years
Phosphorus
Improving-1.11 µg/L/yr6 years
EPA Impairment Status
Lillkweir 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, Recreation.
Source: EPA ATTAINS assessment unit FL2790B · Official waterbody report
Nearby Lakes in Marion County
Frequently asked questions about Lillkweir Lake
Where is Lillkweir Lake?
- Lillkweir Lake is a lake in Marion County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Lillkweir Lake?
- Lillkweir Lake in Marion County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 5.2 ft visibility. Phosphorus: 11.5 µg/L.
Is Lillkweir Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lillkweir Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
What is the water temperature of Lillkweir Lake?
- Lillkweir Lake typically sits around 76°F at the surface in October, from 49 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
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Where this data comes from
24 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 samples24 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