Louisa Ne Sh Lake
Lake County, FloridaView mapDirections
Florida DEP publishes the water-quality measurements for Louisa Ne Sh Lake. Here is what has been measured.
- Eutrophic
- Impaired · Mercury
Louisa Ne Sh Lake in Lake County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3.8 ft visibility. Phosphorus: 36.8 µg/L.
Louisa Ne Sh Lake is a productive, nutrient-rich eutrophic lake in Lake County, Florida. Water clarity is improving over recent sampling years. Compared to the 127 other monitored lakes in Lake County, Louisa Ne Sh Lake ranks #52 for water quality.
Source: EPA Water Quality Portal sampling records, FDEP, last sampled 2025-08-25. Methodology: how these readings are compared.
Swimming conditions
Readings onlyBacteria tested: low
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, Louisa Ne Sh Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 23 samples across 7 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 Louisa Ne Sh 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 Louisa Ne Sh Lake
These are the measurements Florida DEP publishes for Louisa Ne Sh 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 3.8 ft. Phosphorus 36.8 µg/L. TSI 57.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.8ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 36.8µg/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. | 57 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Louisa Ne Sh Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Louisa Ne Sh Lake typically sits around 79°F at the surface in October. Summer average is about 88°F. Usually warmest in Jun (about 89°F) and coldest in Dec (about 67°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (67°F) to its warmest (89°F).
Typical surface water temperature by month, from 43 field readings (2012–2025) via the EPA Water Quality Portal. See the full Louisa Ne Sh Lake water temperature breakdown →
Stays via Stay22
Stays near Louisa Ne Sh Lake
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Fishing Louisa Ne Sh Lake
Water Quality Trend: Stable
Based on 6 years of monitoring (2020–2025).
Water clarity
Improving6 years
Phosphorus
Worsening+2.06 µg/L/yr6 years
EPA Impairment Status
Louisa Ne Sh 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 FL2839M · Official waterbody report
Nearby Lakes in Lake County
Frequently asked questions about Louisa Ne Sh Lake
Where is Louisa Ne Sh Lake?
- Louisa Ne Sh Lake is a lake in Lake County, Florida. Its water-quality measurements are published by Florida DEP and shown on this page as reported.
What is the water quality of Louisa Ne Sh Lake?
- Louisa Ne Sh Lake in Lake County, Florida has water-quality measurements published by Florida DEP, shown here as reported. Water clarity: 3.8 ft visibility. Phosphorus: 36.8 µg/L.
Is Louisa Ne Sh Lake safe to swim in?
- Based on E. coli testing, Louisa Ne Sh Lake never exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 0% of 23 samples across 7 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 Louisa Ne Sh 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 Louisa Ne Sh Lake?
- Louisa Ne Sh Lake typically sits around 79°F at the surface in October, from 43 EPA Water Quality Portal field readings (2012–2025). That is a typical value for the month, not a live reading.
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Where this data comes from
43 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 samples43 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